C4 Fuego 40 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 Fuego 40 T700 Vgr Carbon Fins + Nylon Fins Bag
C4 – C4 Fuego 40 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 Fuego 40 T700 Vgr Carbon Fins + Nylon Fins Bag. Top fiber quality : MEGAFORCE T 700In the fins FUEGO VGR the use of the new fibre MEGAFORCE T 700, HT type yarn (Hight Tensile), allows, thanks to its resistance of 40% more in comparison with the standard yarn T300 and the same elastic module (Tensile Modulus), to considerably improving the resistance to break of fins.In order to understand which importance has, with the purpose to resist breaking, a fibre with more resistance and with the same elastic module, as MEGAFORCE T 700, it is enough to consider which are the stresses and how they are distributed. The beginning of a blade break occurs when, for too much bending, the material is stressed with a least curve ray, exceeding the resistance values. If we suppose a blade section and the stresses on the different layers or sheets are analysed, we discover that during the bending the exterior sheet has a curve ray larger than the sheet that is on the internal side of the blade. The external sheet is so subjected to bending and traction, its opposite side to bending and compression. The sheet that will be placed in the middle of the section will be stressed only to bending.With these stresses, the blade will start breaking when the external layer, the one more subjected to traction, stands no more applied stress. If this layer or sheet has a resistance higher of 40%, it will occur that it starts breaking for traction charges higher of 40%.It is therefore essential that these layers or sheets (the ones external of the blade) have a strong resistance. The resistance of a sheet is improved through two parameters: the physical dimension of the blade (large and/or heavy clothes) and yarns with high resistance, as MEGAFORCE T 700 .The yarn MEGAFORCE T 700 has a percentage stretch to break of 2,1%, in comparison with 1,5% of the standard T300. This improves the flexibility and the resistance to break too; thanks to this a more accentuated fold of the fins can be reached.It is important, both for resistance that for bending, that the yarn MEGAFORCE T 700 has got a standard elastic module as T300. A higher elastic module would make the fin very stiff. A stiff fin doesnt bend and therefore it would not work, as it ought to do. In order to reduce the stiffness of the blade and allow its bending, thinner sheets (light cloth) and so less resistant should be used. This is the reason that makes unsuited the use of yarns HM (Hight Modulus) and light clothes for the manufacture of fins.The carbon blades C4 are composed by more fibre layers and have a progressive lamination to get the required and needed parabolic bending curve.Among the many possible ones, the ideal parabolic curve is the one that water density naturally imposes to fish, this is the more functional for our purpose. If we notice a swimming fish, we will remark as its head (for us the foot) is substantially firm, while the body is bending, more and more approaching to the tail, in an always more marked way. The bending line of the fish is so parabolic, also if at a summary look it seems only the tail is bending. In the fish, as in the fin, all concerned surface is bending, less towards the head (our foot) and more in the last part of the tail (the blade end) with a bending typical of parabola (a simple parabolic function is x = y2). If we consider a blade, as it was a shelf embedded in the foot and subjected to a uniformly distributed charge, we will remark that the section further and further from the foot bend only if the previous ones support them, that is the first ones should bend less. A blade visibly bending next to the feet will not allow to the last stroke to work in the best way, getting so only a partial exploitation of its dimension features.So, this kind of blades cannot work fully in a parabolic way, it is wrong to say it, but on the contrary in a quite uniform way and this is the opposite of a common believing supported by summary observations and bad information. A blade working with a quite uniform bending surely doesnt follow the fish swimming, to which it is certainly not taught how to bend in an efficient way the fins. The blades C4 FUEGO VGR stretches until the foot heel, allowing so the most energy.The blades C4 FUEGO VGR have the most stressed section increased of 15%. Furthermore the position of the fastening screws has been expressly moved away from the blade fold to make void the effect of hole notches. The combination of the increased resistant section, of the lack of holes on the stressed section and of the change of lamination of the blades C4 FUEGO VGR allowed the reaching in laboratory tests of a resistance to break more than 40% in comparison with standard type blades.The very good sport results got by the blades C4, since 1990 until today, are the sure guarantee of the performances of our products and of the correctness of our technical choices.In FUEGO VGR the flap shape of the blade end (patent C4) allows better parabolic bending curves, less energy absorptions and more efficacious water flows detachment from the blade (for more information see the page fins C4 FLAP).VGR – Variable Geometry RailsThe water rails, invented by C4 in 1994, play the role to control, canalising it, the water on the blade. They make the swim with fins stable, the fin moves as led on two rails; the performances are enhanced by the total lack of `derapage` effect.In plain breath-held diving, where the performance is executed in controlled conditions, in quiet waters, in a straight path with constant charges, the performance is obtained with the matching of least energy consumption and highest speed.The requirements for fishing are different, because an easy handling, a sudden spring and variable charges, due both to fishing needs and changing sea weather conditions, are required.Therefore the main thing requested to fins is their adaptability to the changing work conditions to which they are subjected. As we know, the improvement of performance is always reached by adjusting in specific way the features of the tool, to the action needs. Changing needs require modifications in the equipment. Only one thing good for all means to be satisfied with common performances and this is not our philosophy.The water rails VGR (Variable Geometry Rails) let in a new concept in the system of control on the amount of water worked by fins. By them the canalisation of water flows is progressively modified according to the area and the fold of the blade, improving the performances.We know that, owing to the move led by the foot on the fins, the speed of water running on the blade is increased, passing from the foot to the blade end. It is this that provokes the propulsory push of the fins. With the water rails VGR, water amounts worked are progressively modified, following the speed changes of this in the progressive sections of the blade. A further advantage given by the water rails VGR is they take at work a special shape of the L sections, strongly reducing the rips between the layer of moving water on the blades, in comparison with the static one of the sea. The water amount worked by the water rails changes according to their dimensions. Low water rails work little water, if high they work more. With the same conditions of materials, surfaces and applied energy, more is the worked water, stronger is the push. It is for this that long blades pushes more than short ones, because they work more water.With the same conditions, the worked water becomes the one controlled by the water rails, that are useful the largest possible, to work the maximum of water, this consistently with the elastic response of materials, hardness, geometries and dimensions of the fins. Task of the designer is to amalgamate materials, stresses and dimensions to get low consumptions of oxygen and high speeds.Therefore the water rails VGR have the largest possible dimensions for each section of the fins, to make the maximum possible quick the worked water amounts.What is useful, where and when it is useful, it is so that higher speeds and energy saving are obtained, as it is with the water rails VGR.Energy transmission: foot blade positionWhat is the best position for the foot related to the blade, and vice versa-Answering this question calls for a careful observation of strain application and of how movement is executed, both for the foot and the blade.In the fins, the shoe defines the reciprocal position of foot and blade, the components it connects.Some technical features affecting the reciprocal foot and blade positions are unavoidable, others are modifiable. For man its natural to lean against the lower part of metatarsus for applying an effort, like for example against bike pedals, climbing a staircase steps or running. That spot of the foot is where its possible to naturally apply maximum strength and maximum movement, that is to exert maximum work with legs (work = force x movement).The fin blade is mechanically classifiable as a bracket submitted to a load homogeneously distributed. So its possibly to identify, depending on bending, a centre of gravity point of the load applied and its distance from the bracket joint position, in our case where the blade bends, exiting from the shoe.The fulcrum effect to which the load produced by blade movement is applied can be computed as the distance between the projections, on the theoretical advancement axis in a submerged diver, or longitudinal axis, of the metatarsal points and the gravity point of the load applied to the blade. This effect is in direct proportionality to the resistance a diver has to overcome in moving the blade.The lesser this distance, the lesser the effort. In C4 FUEGO VGR, with the foot advanced on the blade by 7 cm (compared to standard foopocket) the reduction of the fulcrum effect is above 20%, with all the following advantages in reducing the energy required.The stiffness variation between 25 and 30 blades, for example, its almost 15%. So using FUEGO VGR 30 will require an amount of energy similar to that required by a FALCON 25, with undeniable advantages in acceleration, speed and safety.Hydrodynamics: blade position and angleMinimum hydrodynamic resistance is obtained when a diver, in vertical position, head up, with completely extended fins, observed from a lateral point of view, has in a single axis all articulation theoretical rotation centres: hip, knee, ankle, metatarsus and fin blades.This is possible only if the blade is placed as in C4 FUEGO VGR, just under foot metatarsus, with the appropriate wide angle, over 23° in C4 FUEGO VGR.On the opposite, traditional footpockets and/or blades with narrower angles, force fins away from the body axis. The diver will be compelled to arch his/her back when swimming (by necessity a symmetrical movement) for moving in a straight line.Arching the back increases the diver frontal section and increases the hydrodynamic resistance. Both the arching and the increase of the resistance subtract energy, detrimental on both dive time and safety.When the angle between the diver axis and the fins axis is too wide its possible to have damages to articulations as knees and ankles. Its plainly impossible with C4 FUEGO VGR; the ergonomics is at its maximum.C4 FUEGO VGR fin is produced taking in account hydrodynamics requirements both because it has thoroughly rayed shapes and a close outline in its shoe, and because it lacks side stiffeners. Without side stiffeners it has been possible to distinctly reduce the shoe frontal section, in the same way reducing related hydrodynamic resistances.Right and Left anatomic shoe.How well a fin fits is an essential feature to the effectiveness of it. The shoe, not anymore simply footpocket, is the primary component in the cinematic chain of energy transmission from the foot to the blade: better the connection, more energy will be transferred to the movement. A freediving fin has an optimal performance if the shoe has good ergonomics, if it fits perfectly to the foot. For this reason we produced anatomic right and left shoes, with a customable regulation of the shoe lacing.A single footpocket, somewhat constricting the foot or letting it free to partially move inside it, has been so far the usual conditions every diver had to deal with, choosing between how much pain to endure or how much energy to disperse.C4 FUEGO VGR simply eliminates at the origin all these problems: they significantly improve how well it fits, giving more comfort and effectiveness to the athletic motion. For obtaining the best ergonomics, C4 shoe has been shaped from the best running shoes, revised to fit freediving divers requirements.Optimal C4 shoe anatomy allowed the use of a strong polymer, so guaranteeing an excellent energy transmission without reducing comfort.The shoe has been planned with different thicknesses, obtaining different resilience in various portions and optimizing energy transmission.The choice to produce shoes without traditional side stiffeners moved the fins centre of gravity toward the foot, making them significantly lighter when swimming.Energy absorption due to side stiffeners in traditional fins has been measured in tests developed in the Engineering Department of Padua University, and it resulted to be of 55% in the hysteresis loop. In C4 FUEGO VGR this energy is not squandered in the shoe, with an obvious benefit in performance.Its easy for all to appreciate the superior comfort due to the anatomic right and left shoe compared to the traditional fin with an identical footpocket for both feet.Shoelacing adjustment.Its easy to obtain a fine custom adjustment of the shoelacing, using the elastic strings C4 FUEGO VGR are provided with. This gives the best possible fit for every foot. Its a system very similar to the one were used to with land shoes: right and left shoes, with laces to tie them up.For the foot, underwater or on land, comfort and energy transmission are exactly the same. Having the possibility to custom adjust the attachment pressure is the maximum a freediver could ask to his/her fins!The lace operates on five points and the adjustment has to be done only once, on land. When decided the attachment pressure and tied up the lace with a knot (see assembly instructions) the diver can forget about it and use C4 FUEGO VGR exactly like all other fins, putting them on and taking them off like its used to.Thanks to the possibility to loosen and tighten at will the shoes it will be possible, changing only the laces, to use thicker or thinner socks, adapting C4 FUEGO VGR to the vagaries of temperature seasons.This system of adjustment, with an elastic lace, has been selected after testing countless solutions. Zips, buckles, numerous kinds of fastenings, Velcro: no one of those, for a multiplicity of reasons, offered better results than elastic lace.Its a solution simple, practical, easy to cope with even if therere problems in a far away island, its enough a piece of rope. Its not metal and it will not rust, its not a device and itll not get stuck, it has not springs, itll not open by accident, it does not carve the shoe polymer, its very light, it spreads out the pressure onto five points, allows an elastic distribution of effort, its truly reliable, its an extremely marine solution and its really inexpensive, a good thing above all this. If the lace breaks up when diving the breaking point will be forcedly in a stretch of it. The friction the remaining portion of it still exerts on other insertion points will prevent the sudden unfastening of the attachment: the diver can so continue to swim in great safety.C4 carbon blades are composed by many layers of fibers and have a progressive lamination for obtaining the required parabolic bending curve. Being bended, external layers are submitted to biggest strains. Therefore the whole blade resilience to the start of breaking greatly depends on the external layer resilience and the blade section involved.C4 FUEGO VGR blades have section resilient to breaking increased by 15%. Moreover the position of fastening screws has been appositely moved away from the blade bend so to cancel the effect of the holes drilled in it.The combination of increasing the resilient section, of non drilling holes in the section under strain and of altering the blade lamination, allowed, in lab tests, the reaching of fracture resilience better than 40% compared to C4 Falcon blade, already so many times put to test.The excellent sports results obtained with C4 blades are a sure guarantee of performances by our products and suitability of our technical choices.C4 FUEGO VGR blade prolong till the heel so to assure maximum energy transmission. Blade measures are 800 x 190 mm. Traditional blades are not compatible with C4 shoes, first because the joint is different and second because theyre not resilient enough, having been planned to use with side stiffener footpockets.C4 FUEGO VGR are assembled with mounting screws, without any glue so to have the best portability.C4 shoes right and left, are provided in five sizes:European sizes: 39/40 – 41/42 – 43/44 – 45/46 47/48US/Canada sizes: 7-7 – 8-8 – 11 -12 – 13-13UK sizes: 6-7 – 7-8 – 8-10 – 11-11 – 12-13C4 FUEGO VGR 25 soft 800 x 190 mmC4 FUEGO VGR 30 medium 800 x 190 mmC4 FUEGO VGR 40 hard 800 x 190 mmAll the C4 products are made 100% with carbon tissue MEGAFORCE T700

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Mares Instinct Pro

Mares Instinct Pro
Mares – Mares Instinct Pro

Mares Instinct Pro. The new evolution of the INSTINCT fin, the INSTINCT PRO is the result of computerdeveloped design and the use of new materials.The tapered-section blade, paired with a new technopolymer, has made it possible to achieve optimum results in terms of both power and thrust modularity.The micro-ribbing on the blade optimizes efficiency.The elongated side ribs have a variable crosssection designed to make the blade deform progressively and create a channeling effect for the water, the true driving force behind the fin.The new shape of the highly-pronounced V blade prevents any risk of slippage.The foot pocket retains all its qualities of comfort and hold for the foot, and at the same time brings even more power to the blade.

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C4 Fuego 25 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 Fuego 25 T700 Vgr Carbon Fins + Nylon Fins Bag
C4 – C4 Fuego 25 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 Fuego 25 T700 Vgr Carbon Fins + Nylon Fins Bag. Top fiber quality : MEGAFORCE T 700In the fins FUEGO VGR the use of the new fibre MEGAFORCE T 700, HT type yarn (Hight Tensile), allows, thanks to its resistance of 40% more in comparison with the standard yarn T300 and the same elastic module (Tensile Modulus), to considerably improving the resistance to break of fins.In order to understand which importance has, with the purpose to resist breaking, a fibre with more resistance and with the same elastic module, as MEGAFORCE T 700, it is enough to consider which are the stresses and how they are distributed. The beginning of a blade break occurs when, for too much bending, the material is stressed with a least curve ray, exceeding the resistance values. If we suppose a blade section and the stresses on the different layers or sheets are analysed, we discover that during the bending the exterior sheet has a curve ray larger than the sheet that is on the internal side of the blade. The external sheet is so subjected to bending and traction, its opposite side to bending and compression. The sheet that will be placed in the middle of the section will be stressed only to bending.With these stresses, the blade will start breaking when the external layer, the one more subjected to traction, stands no more applied stress. If this layer or sheet has a resistance higher of 40%, it will occur that it starts breaking for traction charges higher of 40%.It is therefore essential that these layers or sheets (the ones external of the blade) have a strong resistance. The resistance of a sheet is improved through two parameters: the physical dimension of the blade (large and/or heavy clothes) and yarns with high resistance, as MEGAFORCE T 700 .The yarn MEGAFORCE T 700 has a percentage stretch to break of 2,1%, in comparison with 1,5% of the standard T300. This improves the flexibility and the resistance to break too; thanks to this a more accentuated fold of the fins can be reached.It is important, both for resistance that for bending, that the yarn MEGAFORCE T 700 has got a standard elastic module as T300. A higher elastic module would make the fin very stiff. A stiff fin doesnt bend and therefore it would not work, as it ought to do. In order to reduce the stiffness of the blade and allow its bending, thinner sheets (light cloth) and so less resistant should be used. This is the reason that makes unsuited the use of yarns HM (Hight Modulus) and light clothes for the manufacture of fins.The carbon blades C4 are composed by more fibre layers and have a progressive lamination to get the required and needed parabolic bending curve.Among the many possible ones, the ideal parabolic curve is the one that water density naturally imposes to fish, this is the more functional for our purpose. If we notice a swimming fish, we will remark as its head (for us the foot) is substantially firm, while the body is bending, more and more approaching to the tail, in an always more marked way. The bending line of the fish is so parabolic, also if at a summary look it seems only the tail is bending. In the fish, as in the fin, all concerned surface is bending, less towards the head (our foot) and more in the last part of the tail (the blade end) with a bending typical of parabola (a simple parabolic function is x = y2). If we consider a blade, as it was a shelf embedded in the foot and subjected to a uniformly distributed charge, we will remark that the section further and further from the foot bend only if the previous ones support them, that is the first ones should bend less. A blade visibly bending next to the feet will not allow to the last stroke to work in the best way, getting so only a partial exploitation of its dimension features.So, this kind of blades cannot work fully in a parabolic way, it is wrong to say it, but on the contrary in a quite uniform way and this is the opposite of a common believing supported by summary observations and bad information. A blade working with a quite uniform bending surely doesnt follow the fish swimming, to which it is certainly not taught how to bend in an efficient way the fins. The blades C4 FUEGO VGR stretches until the foot heel, allowing so the most energy.The blades C4 FUEGO VGR have the most stressed section increased of 15%. Furthermore the position of the fastening screws has been expressly moved away from the blade fold to make void the effect of hole notches. The combination of the increased resistant section, of the lack of holes on the stressed section and of the change of lamination of the blades C4 FUEGO VGR allowed the reaching in laboratory tests of a resistance to break more than 40% in comparison with standard type blades.The very good sport results got by the blades C4, since 1990 until today, are the sure guarantee of the performances of our products and of the correctness of our technical choices.In FUEGO VGR the flap shape of the blade end (patent C4) allows better parabolic bending curves, less energy absorptions and more efficacious water flows detachment from the blade (for more information see the page fins C4 FLAP).VGR – Variable Geometry RailsThe water rails, invented by C4 in 1994, play the role to control, canalising it, the water on the blade. They make the swim with fins stable, the fin moves as led on two rails; the performances are enhanced by the total lack of `derapage` effect.In plain breath-held diving, where the performance is executed in controlled conditions, in quiet waters, in a straight path with constant charges, the performance is obtained with the matching of least energy consumption and highest speed.The requirements for fishing are different, because an easy handling, a sudden spring and variable charges, due both to fishing needs and changing sea weather conditions, are required.Therefore the main thing requested to fins is their adaptability to the changing work conditions to which they are subjected. As we know, the improvement of performance is always reached by adjusting in specific way the features of the tool, to the action needs. Changing needs require modifications in the equipment. Only one thing good for all means to be satisfied with common performances and this is not our philosophy.The water rails VGR (Variable Geometry Rails) let in a new concept in the system of control on the amount of water worked by fins. By them the canalisation of water flows is progressively modified according to the area and the fold of the blade, improving the performances.We know that, owing to the move led by the foot on the fins, the speed of water running on the blade is increased, passing from the foot to the blade end. It is this that provokes the propulsory push of the fins. With the water rails VGR, water amounts worked are progressively modified, following the speed changes of this in the progressive sections of the blade. A further advantage given by the water rails VGR is they take at work a special shape of the L sections, strongly reducing the rips between the layer of moving water on the blades, in comparison with the static one of the sea. The water amount worked by the water rails changes according to their dimensions. Low water rails work little water, if high they work more. With the same conditions of materials, surfaces and applied energy, more is the worked water, stronger is the push. It is for this that long blades pushes more than short ones, because they work more water.With the same conditions, the worked water becomes the one controlled by the water rails, that are useful the largest possible, to work the maximum of water, this consistently with the elastic response of materials, hardness, geometries and dimensions of the fins. Task of the designer is to amalgamate materials, stresses and dimensions to get low consumptions of oxygen and high speeds.Therefore the water rails VGR have the largest possible dimensions for each section of the fins, to make the maximum possible quick the worked water amounts.What is useful, where and when it is useful, it is so that higher speeds and energy saving are obtained, as it is with the water rails VGR.Energy transmission: foot blade positionWhat is the best position for the foot related to the blade, and vice versa-Answering this question calls for a careful observation of strain application and of how movement is executed, both for the foot and the blade.In the fins, the shoe defines the reciprocal position of foot and blade, the components it connects.Some technical features affecting the reciprocal foot and blade positions are unavoidable, others are modifiable. For man its natural to lean against the lower part of metatarsus for applying an effort, like for example against bike pedals, climbing a staircase steps or running. That spot of the foot is where its possible to naturally apply maximum strength and maximum movement, that is to exert maximum work with legs (work = force x movement).The fin blade is mechanically classifiable as a bracket submitted to a load homogeneously distributed. So its possibly to identify, depending on bending, a centre of gravity point of the load applied and its distance from the bracket joint position, in our case where the blade bends, exiting from the shoe.The fulcrum effect to which the load produced by blade movement is applied can be computed as the distance between the projections, on the theoretical advancement axis in a submerged diver, or longitudinal axis, of the metatarsal points and the gravity point of the load applied to the blade. This effect is in direct proportionality to the resistance a diver has to overcome in moving the blade.The lesser this distance, the lesser the effort. In C4 FUEGO VGR, with the foot advanced on the blade by 7 cm (compared to standard foopocket) the reduction of the fulcrum effect is above 20%, with all the following advantages in reducing the energy required.The stiffness variation between 25 and 30 blades, for example, its almost 15%. So using FUEGO VGR 30 will require an amount of energy similar to that required by a FALCON 25, with undeniable advantages in acceleration, speed and safety.Hydrodynamics: blade position and angleMinimum hydrodynamic resistance is obtained when a diver, in vertical position, head up, with completely extended fins, observed from a lateral point of view, has in a single axis all articulation theoretical rotation centres: hip, knee, ankle, metatarsus and fin blades.This is possible only if the blade is placed as in C4 FUEGO VGR, just under foot metatarsus, with the appropriate wide angle, over 23° in C4 FUEGO VGR.On the opposite, traditional footpockets and/or blades with narrower angles, force fins away from the body axis. The diver will be compelled to arch his/her back when swimming (by necessity a symmetrical movement) for moving in a straight line.Arching the back increases the diver frontal section and increases the hydrodynamic resistance. Both the arching and the increase of the resistance subtract energy, detrimental on both dive time and safety.When the angle between the diver axis and the fins axis is too wide its possible to have damages to articulations as knees and ankles. Its plainly impossible with C4 FUEGO VGR; the ergonomics is at its maximum.C4 FUEGO VGR fin is produced taking in account hydrodynamics requirements both because it has thoroughly rayed shapes and a close outline in its shoe, and because it lacks side stiffeners. Without side stiffeners it has been possible to distinctly reduce the shoe frontal section, in the same way reducing related hydrodynamic resistances.Right and Left anatomic shoe.How well a fin fits is an essential feature to the effectiveness of it. The shoe, not anymore simply footpocket, is the primary component in the cinematic chain of energy transmission from the foot to the blade: better the connection, more energy will be transferred to the movement. A freediving fin has an optimal performance if the shoe has good ergonomics, if it fits perfectly to the foot. For this reason we produced anatomic right and left shoes, with a customable regulation of the shoe lacing.A single footpocket, somewhat constricting the foot or letting it free to partially move inside it, has been so far the usual conditions every diver had to deal with, choosing between how much pain to endure or how much energy to disperse.C4 FUEGO VGR simply eliminates at the origin all these problems: they significantly improve how well it fits, giving more comfort and effectiveness to the athletic motion. For obtaining the best ergonomics, C4 shoe has been shaped from the best running shoes, revised to fit freediving divers requirements.Optimal C4 shoe anatomy allowed the use of a strong polymer, so guaranteeing an excellent energy transmission without reducing comfort.The shoe has been planned with different thicknesses, obtaining different resilience in various portions and optimizing energy transmission.The choice to produce shoes without traditional side stiffeners moved the fins centre of gravity toward the foot, making them significantly lighter when swimming.Energy absorption due to side stiffeners in traditional fins has been measured in tests developed in the Engineering Department of Padua University, and it resulted to be of 55% in the hysteresis loop. In C4 FUEGO VGR this energy is not squandered in the shoe, with an obvious benefit in performance.Its easy for all to appreciate the superior comfort due to the anatomic right and left shoe compared to the traditional fin with an identical footpocket for both feet.Shoelacing adjustment.Its easy to obtain a fine custom adjustment of the shoelacing, using the elastic strings C4 FUEGO VGR are provided with. This gives the best possible fit for every foot. Its a system very similar to the one were used to with land shoes: right and left shoes, with laces to tie them up.For the foot, underwater or on land, comfort and energy transmission are exactly the same. Having the possibility to custom adjust the attachment pressure is the maximum a freediver could ask to his/her fins!The lace operates on five points and the adjustment has to be done only once, on land. When decided the attachment pressure and tied up the lace with a knot (see assembly instructions) the diver can forget about it and use C4 FUEGO VGR exactly like all other fins, putting them on and taking them off like its used to.Thanks to the possibility to loosen and tighten at will the shoes it will be possible, changing only the laces, to use thicker or thinner socks, adapting C4 FUEGO VGR to the vagaries of temperature seasons.This system of adjustment, with an elastic lace, has been selected after testing countless solutions. Zips, buckles, numerous kinds of fastenings, Velcro: no one of those, for a multiplicity of reasons, offered better results than elastic lace.Its a solution simple, practical, easy to cope with even if therere problems in a far away island, its enough a piece of rope. Its not metal and it will not rust, its not a device and itll not get stuck, it has not springs, itll not open by accident, it does not carve the shoe polymer, its very light, it spreads out the pressure onto five points, allows an elastic distribution of effort, its truly reliable, its an extremely marine solution and its really inexpensive, a good thing above all this. If the lace breaks up when diving the breaking point will be forcedly in a stretch of it. The friction the remaining portion of it still exerts on other insertion points will prevent the sudden unfastening of the attachment: the diver can so continue to swim in great safety.C4 carbon blades are composed by many layers of fibers and have a progressive lamination for obtaining the required parabolic bending curve. Being bended, external layers are submitted to biggest strains. Therefore the whole blade resilience to the start of breaking greatly depends on the external layer resilience and the blade section involved.C4 FUEGO VGR blades have section resilient to breaking increased by 15%. Moreover the position of fastening screws has been appositely moved away from the blade bend so to cancel the effect of the holes drilled in it.The combination of increasing the resilient section, of non drilling holes in the section under strain and of altering the blade lamination, allowed, in lab tests, the reaching of fracture resilience better than 40% compared to C4 Falcon blade, already so many times put to test.The excellent sports results obtained with C4 blades are a sure guarantee of performances by our products and suitability of our technical choices.C4 FUEGO VGR blade prolong till the heel so to assure maximum energy transmission. Blade measures are 800 x 190 mm. Traditional blades are not compatible with C4 shoes, first because the joint is different and second because theyre not resilient enough, having been planned to use with side stiffener footpockets.C4 FUEGO VGR are assembled with mounting screws, without any glue so to have the best portability.C4 shoes right and left, are provided in five sizes:European sizes: 39/40 – 41/42 – 43/44 – 45/46 47/48US/Canada sizes: 7-7 – 8-8 – 11 -12 – 13-13UK sizes: 6-7 – 7-8 – 8-10 – 11-11 – 12-13C4 FUEGO VGR 25 soft 800 x 190 mmC4 FUEGO VGR 30 medium 800 x 190 mmC4 FUEGO VGR 40 hard 800 x 190 mmAll the C4 products are made 100% with carbon tissue MEGAFORCE T700

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Omer Stingray Camu 3d 2012

Omer Stingray Camu 3d 2012
Omer – Omer Stingray Camu 3d 2012

Omer Stingray Camu 3d 2012. This is the new camouflage release of traditional StingRay fins. The 3D camouflage pattern is obtained using the new IML technology, for the first time employed by Omer for the spearfishing equipments. A film with the bottom sea picture is put directly on the blade during the molding to assure a high resistance to abrasion. This blades are a little stronger than black StingRay blades.

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Imersion E:carbon

Imersion E:carbon
Imersion – Imersion E:carbon

Imersion E:carbon. Ideal for deep freediving scuba dives under heavy current and other activities requiring maximum power !Loaded with resin and synthetic fibers it offers higher rigidity. The black graphite blade delivers the highest response. The extension of the blade under the heel leads to the transfer of power directly on the blade.Blade length : 31`- 78cm.

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Sporasub Spitfire Black

Sporasub Spitfire Black
Sporasub – Sporasub Spitfire Black

Sporasub Spitfire Black. Features:- New fin foot pocket made of thermo with two different hardnesses to associate the comfort of the highest performance.- The green parts have a hardness of only 40 sh and allows the part that makes contact with the ball of the foot and toes very soft and comfortable.- The black color components have instead a hardness of 90 sh without dispersion to transmit the power emitted by the leg to the upper.- Under the heel there has been a slip anti taxed.- The blade is made of polypropylene, low modulus and is equipped with two ½water railsâ â ¤ ¤- eliminating the drifting effect.- Intermediate hardness fits all styles of fishing.

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Spetton Mf30 Evo Flex

Spetton Mf30 Evo Flex
Spetton – Spetton Mf30 Evo Flex

Spetton Mf30 Evo Flex. Insurmountable performance, new canalizations, quiet and very comfortable, progressive strength.Spetton shoe included as standard in all sizes.A progressive strength blade, more evolutionated, with a special canalization which stabilizes the fluttering.High performance.Size: 830 x 210 cm

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Cressi Gara Professional Ld

Cressi Gara Professional Ld
Cressi – Cressi Gara Professional Ld

Cressi Gara Professional Ld. Following the great success of the Gara Professional, Cressi has also thought of those who wish to benefit from all the winning characteristics of the Gara Professional, without having the muscles of an athlete that is trained to full capacity. The blade is made from a special elastomer polypropylene which gives a longer lasting, more fluid, softer kick that is less demanding, making it ideal for covering long distances.The use of this new engineering plastic is less reactive and nervous than the Compoflex used in the Gara Professional. It guarantees progressive and well controlled blade flexibility which gives an extremely fluid kick. Together with the exceptional lightness and no dispersion of effort, the kick is more effective and pleasant than ever.Like the other Gara fins (2000 HP 3000 LD Gara Professional) in the Cressi range, the Gara Professional LD also boasts an industrial production process that guarantees very high standards of precision and response to strict technical parameters that are impossible to obtain with traditional craftsmens techniques.The new shoe pocket on the Gara Professional LD has been designed so that it is positioned under the actual blade. This characteristic, together with a perfect union between blade and foot, contributes to reducing effort and energy dispersion as much as possible during the kick.The anatomy of the foot pocket has been re-designed and, if possible, further improved compared to the already much appreciated shoe pockets of the Cressi Gara. The use of a new, particularly soft elastomer further increases comfort. Who they are for The new Gara Professional LD are for all those divers who wish to benefit from the extraordinary performance of Cressi long fins, without, on the other hand, having to use too much muscular effort. For those divers who have not undergone excessive training, the ideal effort-productivity ratio can offer even higher performance than when using the more rigid and reactive Gara Professional. Perfect for long kicks and for cold water, but also ideal for use with breathing apparatus, where their exceptional propulsion qualities will astound.

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Mares Razor Pro

Mares Razor Pro
Mares – Mares Razor Pro

Mares Razor Pro. New fin with interchangeable blade.-Mares is the only company in the world that has a computerized test bench for design and testing of fins.-The characteristics of the foot pocket incorporate comfort, technique, and efficiency.-The volume and additional thickness on the instep or the tensioners under the arch have been meticulously studied to convey maximum thrust from the product without sacrificing ideal comfort.-The foot pocket is manufactured in a single material one of the lightest thus eliminating any problems in bonds between different materials and offering excellent mechanical properties..The significant side ribs perfectly support the blade, channelling the flow of water. They also prevent lateral slippage.-The variable-thickness blade bends during the various phases of finning action, achieving the ideal flexion curve.-The best technopolymers are used in this fin and increase its agility and resistance.-The special design of the channels makes it possible to increase and channel the flow of water toward the pronounced V at the end of the blade, thus increasing thrust and preventing slippage to the side.-Its light weight and power give the Razor Pro the best yield among all the technopolymer fins currently available on the market.

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Omer Stingray Carbon 30

Omer Stingray Carbon 30
Omer – Omer Stingray Carbon 30

Omer Stingray Carbon 30. The new Stingray Carbon fins feature carbon fiber blades manufactured using the infusion technology with innovative double vacuum process. Thanks to this technology the carbon fiber stands are impregnated perfectly in the resin without the risk of forming micro bubbles and with an optimal distribution of the resin itself.In addition the percentage of necessary resin is reduced considerably more than before with a great increase in performance characteristics of the blade. The specific carbon fiber strand used was developed specifically for the manufacture of freediving fins and patented.The underlying result is a very comfortable fin, in part thanks to the thermo-rubber foot-pockets, providing high performance to the diver. Aside from not tiring out the divers legs while kicking on the surface for extended periods the Stingray Carbon blades push the diver the most during descents and ascents even in great depths.The interchangeable blades are available in three degrees of stiffness: 20 soft, 25 medium, and 30 hard. The sizes of the foot-pockets are 41-42,43-44,45-46 and 47-48.

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Omer Stingray Short

Omer Stingray Short
Omer – Omer Stingray Short

Omer Stingray Short. The new StingRay Short features a 15cm shorter blade. The shorter blade allows the use for long time without tiring out the divers legs while kicking on the surface.Perfect for beginners and for spearfishers who love the shallow water. A new foot pocket has been expressly designed for this blade. The side rubbers are shorter and thinner to optimize the efficiency of this fin.

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Mares Instinct Pro Camo

Mares Instinct Pro Camo
Mares – Mares Instinct Pro Camo

Mares Instinct Pro Camo. The Instinct Pro is the result of a meticulous computer generated design with the use of new materials.The tapered-section blade, paired with a new technopolymer, has made it possible to achieve optimum results in terms of both power and thrust modularity.The micro-ribbing on the blade optimizes efficiency.The elongated lateral stringers have a tapered section designed to make the blades flexibility more progressive and to create a channeling effect with the water, the fins true driving power.The shape of the highly-pronounced V blade prevents any risk of slippage.The foot pocket retains all its qualities of comfort and hold for the foot, and at the same time brings even more power to the blade.

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Omer Stingray Carbon 25 Camu 3d

Omer Stingray Carbon 25 Camu 3d
Omer – Omer Stingray Carbon 25 Camu 3d

Omer Stingray Carbon 25 Camu 3d. This new StingRay Carbon version have a special 3D camouflage finish reproducing exactly a typical sea bottom. This has been possible using the new technology IML, for the first time employed by Omer for the spearfishing equipments. This technology allows to put a film with the bottom sea picture directly on the carbon surface during the blade molding to assure a high resistance to abrasion. Available in degree of stiffness: 25 (medium).At OMER we realized a huge tank, expressly designed for testing our fins. It features a mechanical arm, simulating divers legs movements, working 24/7 and measuring both effort and thrust.

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Imersion E:black Open Heel Fins

Imersion E:black Open Heel Fins
Imersion – Imersion E:black Open Heel Fins

Imersion E:black Open Heel Fins. Ideal for deep freediving and scuba diving under heavy current and other activities requiring maximum power! Loaded with resin and synthetic fibers it offers a higher rigidity. The black graphite blade delivers the highest response, using the progressive flexibility technology. The extension of the blade under the heel leads to the transfer of power directly to the blade.The comfort of the Imersion foot pocket, never equalled, provides a mixed feeling of lightness and power.Features:- Blade length : 78 cm / 31`- 4 Sizes in Full Foot- 2 Sizes Open Heel

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C4 F81 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 F81 T700 Vgr Carbon Fins + Nylon Fins Bag
C4 – C4 F81 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 F81 T700 Vgr Carbon Fins + Nylon Fins Bag. VGR Carbon fiber T700 strand is 40% stronger than the previous T300 strand used for years and lighter.The new shape is more efficient and is an exagerated Flap design with a forward protruding round edge.Overall blade length is 92cm or approx. 36`Yellow rubber side rails for hightened visibility for Apnea diversYellow Mustang footpockets complement the rails for high visibility.

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Omer Stingray Carbon 25

Omer Stingray Carbon 25
Omer – Omer Stingray Carbon 25

Omer Stingray Carbon 25. The new Stingray Carbon fins feature carbon fiber blades manufactured using the infusion technology with innovative double vacuum process. Thanks to this technology the carbon fiber stands are impregnated perfectly in the resin without the risk of forming micro bubbles and with an optimal distribution of the resin itself.In addition the percentage of necessary resin is reduced considerably more than before with a great increase in performance characteristics of the blade. The specific carbon fiber strand used was developed specifically for the manufacture of freediving fins and patented.The underlying result is a very comfortable fin, in part thanks to the thermo-rubber foot-pockets, providing high performance to the diver. Aside from not tiring out the divers legs while kicking on the surface for extended periods the Stingray Carbon blades push the diver the most during descents and ascents even in great depths.The interchangeable blades are available in three degrees of stiffness: 20 soft, 25 medium, and 30 hard. The sizes of the foot-pockets are 41-42,43-44,45-46 and 47-48.

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Sporasub Revolution

Sporasub Revolution
Sporasub – Sporasub Revolution

Sporasub Revolution. SHOE POCKETThe Revolution fin shoe pocket is conceived and designed like a real shoe, and is surely the most comfortable shoe pocket available on the market today. It is available in seven sizes: from 40 to 46.The vamp of the shoe pocket is premoulded and built in nylon with a polyurethane covering. Both materials are water-proof and highly resistant in water.The padding and internal sole are also water-repellent, so they do not absorb water or allow for water stagnation.The three Velcro straps give the shoe a perfect grip, while also changing the thickness of the shoes.The sole is made in Grivory thermoplastic by EMS with non-slip heels made in polyurethane. The stiffness of these materials allows the diver to unload leg movement on the fins without wasting energy, giving you the highest level of performance.The sole also has drain channels on the inside, which allow for emptying of water after fishing, in order to avoid water stagnation or build-up of mold in the shoe.The vamp is connected to the sole through structural bonding. Moreover, in the front part of the shoe, where there is the most stress while swimming, the top part is connected to the sole by two rust-proof rivets.BLADERemovable and replaceable fin with high modulus polypropylene.The 26° angle of the fin, with respect to the axis of the sole, creates a push that is equal during down-kick and up-kick, limiting the area of standstill where there is no thrust.Five stabilizers have been inserted in the fin. The four lateral stabilizers, two on the upper part and two on the bottom, impede fin leeway during swimming.The central-upper stabilizer, moreover, while standing still during fishing, keeps the fin slightly off the sea floor and thus limits any lifting of sediments.The fin is connected to the shoe pocket through the use of three stainless steel M5 metric screws.It is available with the black finish.

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Beuchat Mundial Sport

Beuchat Mundial Sport
Beuchat – Beuchat Mundial Sport

Beuchat Mundial Sport. The Mundial free diving long fin is derived by utilizing BEUCHAT extensive experience in the manufacturing of three distinct material fins.Conceived from a combination of material to realize; flexibility, power, and resistance for optimum performance. The foot cavity is re-inforced to transmit power to the blade without any diver discomfort.Supports for the blade is integrated onto the foot cavity to optimize movement of the blade with side stiffeners and channeled surface on longer fin strokes , based on user requirements and power imput.

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Omer Stingray Carbon 30 Camu 3d

Omer Stingray Carbon 30 Camu 3d
Omer – Omer Stingray Carbon 30 Camu 3d

Omer Stingray Carbon 30 Camu 3d. The new Stingray Carbon fins feature carbon fiber blades manufactured using the infusion technology with innovative double vacuum process. Thanks to this technology the carbon fiber stands are impregnated perfectly in the resin without the risk of forming micro bubbles and with an optimal distribution of the resin itself.In addition the percentage of necessary resin is reduced considerably more than before with a great increase in performance characteristics ofthe blade.The specific carbon fiber strand used was developed specifically for the manufacture of freediving fins and patented.The underlying result is a very comfortable fin, in part thanks to the thermo-rubber foot-pockets, providing high performance to the diver. Aside from not tiring out the divers legs while kicking on the surface for extended periods the Stingray Carbon blades push the diver the most during descents and ascents even in great depths.The interchangeable blades are available in three degrees of stiffness: 20 soft, 25 medium, and 30 hard.

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C4 Fuego 30 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 Fuego 30 T700 Vgr Carbon Fins + Nylon Fins Bag
C4 – C4 Fuego 30 T700 Vgr Carbon Fins + Nylon Fins Bag

C4 Fuego 30 T700 Vgr Carbon Fins + Nylon Fins Bag. Top fiber quality : MEGAFORCE T 700In the fins FUEGO VGR the use of the new fibre MEGAFORCE T 700, HT type yarn (Hight Tensile), allows, thanks to its resistance of 40% more in comparison with the standard yarn T300 and the same elastic module (Tensile Modulus), to considerably improving the resistance to break of fins.In order to understand which importance has, with the purpose to resist breaking, a fibre with more resistance and with the same elastic module, as MEGAFORCE T 700, it is enough to consider which are the stresses and how they are distributed. The beginning of a blade break occurs when, for too much bending, the material is stressed with a least curve ray, exceeding the resistance values. If we suppose a blade section and the stresses on the different layers or sheets are analysed, we discover that during the bending the exterior sheet has a curve ray larger than the sheet that is on the internal side of the blade. The external sheet is so subjected to bending and traction, its opposite side to bending and compression. The sheet that will be placed in the middle of the section will be stressed only to bending.With these stresses, the blade will start breaking when the external layer, the one more subjected to traction, stands no more applied stress. If this layer or sheet has a resistance higher of 40%, it will occur that it starts breaking for traction charges higher of 40%.It is therefore essential that these layers or sheets (the ones external of the blade) have a strong resistance. The resistance of a sheet is improved through two parameters: the physical dimension of the blade (large and/or heavy clothes) and yarns with high resistance, as MEGAFORCE T 700 .The yarn MEGAFORCE T 700 has a percentage stretch to break of 2,1%, in comparison with 1,5% of the standard T300. This improves the flexibility and the resistance to break too; thanks to this a more accentuated fold of the fins can be reached.It is important, both for resistance that for bending, that the yarn MEGAFORCE T 700 has got a standard elastic module as T300. A higher elastic module would make the fin very stiff. A stiff fin doesnt bend and therefore it would not work, as it ought to do. In order to reduce the stiffness of the blade and allow its bending, thinner sheets (light cloth) and so less resistant should be used. This is the reason that makes unsuited the use of yarns HM (Hight Modulus) and light clothes for the manufacture of fins.The carbon blades C4 are composed by more fibre layers and have a progressive lamination to get the required and needed parabolic bending curve.Among the many possible ones, the ideal parabolic curve is the one that water density naturally imposes to fish, this is the more functional for our purpose. If we notice a swimming fish, we will remark as its head (for us the foot) is substantially firm, while the body is bending, more and more approaching to the tail, in an always more marked way. The bending line of the fish is so parabolic, also if at a summary look it seems only the tail is bending. In the fish, as in the fin, all concerned surface is bending, less towards the head (our foot) and more in the last part of the tail (the blade end) with a bending typical of parabola (a simple parabolic function is x = y2). If we consider a blade, as it was a shelf embedded in the foot and subjected to a uniformly distributed charge, we will remark that the section further and further from the foot bend only if the previous ones support them, that is the first ones should bend less. A blade visibly bending next to the feet will not allow to the last stroke to work in the best way, getting so only a partial exploitation of its dimension features.So, this kind of blades cannot work fully in a parabolic way, it is wrong to say it, but on the contrary in a quite uniform way and this is the opposite of a common believing supported by summary observations and bad information. A blade working with a quite uniform bending surely doesnt follow the fish swimming, to which it is certainly not taught how to bend in an efficient way the fins. The blades C4 FUEGO VGR stretches until the foot heel, allowing so the most energy.The blades C4 FUEGO VGR have the most stressed section increased of 15%. Furthermore the position of the fastening screws has been expressly moved away from the blade fold to make void the effect of hole notches. The combination of the increased resistant section, of the lack of holes on the stressed section and of the change of lamination of the blades C4 FUEGO VGR allowed the reaching in laboratory tests of a resistance to break more than 40% in comparison with standard type blades.The very good sport results got by the blades C4, since 1990 until today, are the sure guarantee of the performances of our products and of the correctness of our technical choices.In FUEGO VGR the flap shape of the blade end (patent C4) allows better parabolic bending curves, less energy absorptions and more efficacious water flows detachment from the blade (for more information see the page fins C4 FLAP).VGR – Variable Geometry RailsThe water rails, invented by C4 in 1994, play the role to control, canalising it, the water on the blade. They make the swim with fins stable, the fin moves as led on two rails; the performances are enhanced by the total lack of `derapage` effect.In plain breath-held diving, where the performance is executed in controlled conditions, in quiet waters, in a straight path with constant charges, the performance is obtained with the matching of least energy consumption and highest speed.The requirements for fishing are different, because an easy handling, a sudden spring and variable charges, due both to fishing needs and changing sea weather conditions, are required.Therefore the main thing requested to fins is their adaptability to the changing work conditions to which they are subjected. As we know, the improvement of performance is always reached by adjusting in specific way the features of the tool, to the action needs. Changing needs require modifications in the equipment. Only one thing good for all means to be satisfied with common performances and this is not our philosophy.The water rails VGR (Variable Geometry Rails) let in a new concept in the system of control on the amount of water worked by fins. By them the canalisation of water flows is progressively modified according to the area and the fold of the blade, improving the performances.We know that, owing to the move led by the foot on the fins, the speed of water running on the blade is increased, passing from the foot to the blade end. It is this that provokes the propulsory push of the fins. With the water rails VGR, water amounts worked are progressively modified, following the speed changes of this in the progressive sections of the blade. A further advantage given by the water rails VGR is they take at work a special shape of the L sections, strongly reducing the rips between the layer of moving water on the blades, in comparison with the static one of the sea. The water amount worked by the water rails changes according to their dimensions. Low water rails work little water, if high they work more. With the same conditions of materials, surfaces and applied energy, more is the worked water, stronger is the push. It is for this that long blades pushes more than short ones, because they work more water.With the same conditions, the worked water becomes the one controlled by the water rails, that are useful the largest possible, to work the maximum of water, this consistently with the elastic response of materials, hardness, geometries and dimensions of the fins. Task of the designer is to amalgamate materials, stresses and dimensions to get low consumptions of oxygen and high speeds.Therefore the water rails VGR have the largest possible dimensions for each section of the fins, to make the maximum possible quick the worked water amounts.What is useful, where and when it is useful, it is so that higher speeds and energy saving are obtained, as it is with the water rails VGR.Energy transmission: foot blade positionWhat is the best position for the foot related to the blade, and vice versa-Answering this question calls for a careful observation of strain application and of how movement is executed, both for the foot and the blade.In the fins, the shoe defines the reciprocal position of foot and blade, the components it connects.Some technical features affecting the reciprocal foot and blade positions are unavoidable, others are modifiable. For man its natural to lean against the lower part of metatarsus for applying an effort, like for example against bike pedals, climbing a staircase steps or running. That spot of the foot is where its possible to naturally apply maximum strength and maximum movement, that is to exert maximum work with legs (work = force x movement).The fin blade is mechanically classifiable as a bracket submitted to a load homogeneously distributed. So its possibly to identify, depending on bending, a centre of gravity point of the load applied and its distance from the bracket joint position, in our case where the blade bends, exiting from the shoe.The fulcrum effect to which the load produced by blade movement is applied can be computed as the distance between the projections, on the theoretical advancement axis in a submerged diver, or longitudinal axis, of the metatarsal points and the gravity point of the load applied to the blade. This effect is in direct proportionality to the resistance a diver has to overcome in moving the blade.The lesser this distance, the lesser the effort. In C4 FUEGO VGR, with the foot advanced on the blade by 7 cm (compared to standard foopocket) the reduction of the fulcrum effect is above 20%, with all the following advantages in reducing the energy required.The stiffness variation between 25 and 30 blades, for example, its almost 15%. So using FUEGO VGR 30 will require an amount of energy similar to that required by a FALCON 25, with undeniable advantages in acceleration, speed and safety.Hydrodynamics: blade position and angleMinimum hydrodynamic resistance is obtained when a diver, in vertical position, head up, with completely extended fins, observed from a lateral point of view, has in a single axis all articulation theoretical rotation centres: hip, knee, ankle, metatarsus and fin blades.This is possible only if the blade is placed as in C4 FUEGO VGR, just under foot metatarsus, with the appropriate wide angle, over 23° in C4 FUEGO VGR.On the opposite, traditional footpockets and/or blades with narrower angles, force fins away from the body axis. The diver will be compelled to arch his/her back when swimming (by necessity a symmetrical movement) for moving in a straight line.Arching the back increases the diver frontal section and increases the hydrodynamic resistance. Both the arching and the increase of the resistance subtract energy, detrimental on both dive time and safety.When the angle between the diver axis and the fins axis is too wide its possible to have damages to articulations as knees and ankles. Its plainly impossible with C4 FUEGO VGR; the ergonomics is at its maximum.C4 FUEGO VGR fin is produced taking in account hydrodynamics requirements both because it has thoroughly rayed shapes and a close outline in its shoe, and because it lacks side stiffeners. Without side stiffeners it has been possible to distinctly reduce the shoe frontal section, in the same way reducing related hydrodynamic resistances.Right and Left anatomic shoe.How well a fin fits is an essential feature to the effectiveness of it. The shoe, not anymore simply footpocket, is the primary component in the cinematic chain of energy transmission from the foot to the blade: better the connection, more energy will be transferred to the movement. A freediving fin has an optimal performance if the shoe has good ergonomics, if it fits perfectly to the foot. For this reason we produced anatomic right and left shoes, with a customable regulation of the shoe lacing.A single footpocket, somewhat constricting the foot or letting it free to partially move inside it, has been so far the usual conditions every diver had to deal with, choosing between how much pain to endure or how much energy to disperse.C4 FUEGO VGR simply eliminates at the origin all these problems: they significantly improve how well it fits, giving more comfort and effectiveness to the athletic motion. For obtaining the best ergonomics, C4 shoe has been shaped from the best running shoes, revised to fit freediving divers requirements.Optimal C4 shoe anatomy allowed the use of a strong polymer, so guaranteeing an excellent energy transmission without reducing comfort.The shoe has been planned with different thicknesses, obtaining different resilience in various portions and optimizing energy transmission.The choice to produce shoes without traditional side stiffeners moved the fins centre of gravity toward the foot, making them significantly lighter when swimming.Energy absorption due to side stiffeners in traditional fins has been measured in tests developed in the Engineering Department of Padua University, and it resulted to be of 55% in the hysteresis loop. In C4 FUEGO VGR this energy is not squandered in the shoe, with an obvious benefit in performance.Its easy for all to appreciate the superior comfort due to the anatomic right and left shoe compared to the traditional fin with an identical footpocket for both feet.Shoelacing adjustment.Its easy to obtain a fine custom adjustment of the shoelacing, using the elastic strings C4 FUEGO VGR are provided with. This gives the best possible fit for every foot. Its a system very similar to the one were used to with land shoes: right and left shoes, with laces to tie them up.For the foot, underwater or on land, comfort and energy transmission are exactly the same. Having the possibility to custom adjust the attachment pressure is the maximum a freediver could ask to his/her fins!The lace operates on five points and the adjustment has to be done only once, on land. When decided the attachment pressure and tied up the lace with a knot (see assembly instructions) the diver can forget about it and use C4 FUEGO VGR exactly like all other fins, putting them on and taking them off like its used to.Thanks to the possibility to loosen and tighten at will the shoes it will be possible, changing only the laces, to use thicker or thinner socks, adapting C4 FUEGO VGR to the vagaries of temperature seasons.This system of adjustment, with an elastic lace, has been selected after testing countless solutions. Zips, buckles, numerous kinds of fastenings, Velcro: no one of those, for a multiplicity of reasons, offered better results than elastic lace.Its a solution simple, practical, easy to cope with even if therere problems in a far away island, its enough a piece of rope. Its not metal and it will not rust, its not a device and itll not get stuck, it has not springs, itll not open by accident, it does not carve the shoe polymer, its very light, it spreads out the pressure onto five points, allows an elastic distribution of effort, its truly reliable, its an extremely marine solution and its really inexpensive, a good thing above all this. If the lace breaks up when diving the breaking point will be forcedly in a stretch of it. The friction the remaining portion of it still exerts on other insertion points will prevent the sudden unfastening of the attachment: the diver can so continue to swim in great safety.C4 carbon blades are composed by many layers of fibers and have a progressive lamination for obtaining the required parabolic bending curve. Being bended, external layers are submitted to biggest strains. Therefore the whole blade resilience to the start of breaking greatly depends on the external layer resilience and the blade section involved.C4 FUEGO VGR blades have section resilient to breaking increased by 15%. Moreover the position of fastening screws has been appositely moved away from the blade bend so to cancel the effect of the holes drilled in it.The combination of increasing the resilient section, of non drilling holes in the section under strain and of altering the blade lamination, allowed, in lab tests, the reaching of fracture resilience better than 40% compared to C4 Falcon blade, already so many times put to test.The excellent sports results obtained with C4 blades are a sure guarantee of performances by our products and suitability of our technical choices.C4 FUEGO VGR blade prolong till the heel so to assure maximum energy transmission. Blade measures are 800 x 190 mm. Traditional blades are not compatible with C4 shoes, first because the joint is different and second because theyre not resilient enough, having been planned to use with side stiffener footpockets.C4 FUEGO VGR are assembled with mounting screws, without any glue so to have the best portability.C4 shoes right and left, are provided in five sizes:European sizes: 39/40 – 41/42 – 43/44 – 45/46 47/48US/Canada sizes: 7-7 – 8-8 – 11 -12 – 13-13UK sizes: 6-7 – 7-8 – 8-10 – 11-11 – 12-13C4 FUEGO VGR 25 soft 800 x 190 mmC4 FUEGO VGR 30 medium 800 x 190 mmC4 FUEGO VGR 40 hard 800 x 190 mmAll the C4 products are made 100% with carbon tissue MEGAFORCE T700

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