Reviews about C4 C4 Falcon Blades (pair)
C4 C4 Falcon Blades (pair):
The aim is to use carbon fibres for diving, obtaining significant improvements in the equipment’s performance.
The sea is a hostile environment for man, so equipment is fundamental in order to operate. Movement is the first thing to be achieved in order to enable any form of operation. The flippers are the equipment which transforms our energy into movement. You may often hear about more powerful flippers, which is far from the truth. Flippers transmit energy, and since they cannot produce it, they have the same effect as a boat with a propeller rather than a motor: in this case our legs are our motor.
There are two design philosophies regarding diving flippers: one tends to create a spoon effect, while the other creates flexible inclined planes that move by gliding through the water. Flippers with the spoon effect are inspired by fish fins. Unfortunately fish fins are connected to bands of muscles, and the form they take during movement is due to the fact that they are alive. As opposed to the scuba diver’s flippers, they also act as the motor and transmission, which is totally impossible for the scuba diver. To give these flippers their characteristic spoon deformation, some of the scuba diver’s energy has to be used in order to deform the flipper. The greater the deformation, the more energy is used, reducing energy needed for moving the scuba diver ahead. The flipper adjusted to the spoon shape uses a lot of water only when deformed to its maximum, which is obtained for a short time by flipping movement, creating an erratic, throbbing push. As we have learnt from physics, the greatest consumption of energy occurs during accelerations, a throbbing push that makes us accelerate at each leg movement. These flippers are very easy to use, as the throbbing movement required is similar to the natural walking movement, providing high performance even for those who aren’t trained in swimming with flippers.
The carbon fibres are low stretch materials, but to create a spoon effect, the materials used have to be stretchable. Only a fool thinks that a composite flipper can be deformed along two lines forming a spoon, since however many “waves” the surface of the blades can have, the laws of physics provide no alternatives.
The construction philosophy of the C4 flippers has always aimed at obtaining the highest performances, so our flippers work like flexible inclined planes with very high spring back (extremely small hysteresis loops). They glide through the water, covering a sine curve that produces a practically constant push, thanks to the different angles of the leg muscles during the flipping movement along with appropriate training. A constant push requires less accelerations, which means a lower consumption of energy necessary for moving ahead in the water. The bend of our blades is deliberately gradual, and the laws of motion in a fluid follow exponential rather than linear progressions (constant curving). As an example, just look at a fish from above: while swimming the curving is progressive, with the head almost immobile and gradually more curved towards the tip of the tail.
On the sides of the C4 flippers, there are vertical edges in rubber that serve to protect the carbon blade from any abrasions. By moving in the water, the flippers create swirls and vortexes of water along its sides, actually losing 50% of the energy that we use for moving with flippers. It is very easy to test this out: just apply coloured cotton threads each 4/5 cm long on the blades with adhesive tape, in a checkerboard arrangement. Moving with flippers, we can see which direction the water takes. If the flippers are without high lateral edges, for the FALCON C4 they are 24 mm high, the threads will be positioned at 45°, showing that half of our hard-earned energy is lost.
There are two materials making up the carbon flipper blades: resins and fibres. There are various types of usable thermosetting resins, that is epoxy and polyester resins. Epoxy resins have the best mechanical characteristics, and coupled with carbon fibre they make the best construction material known to man. Used in the aerospace industry and racing cars etc., they obviously cost accordingly. The polyester resins have low mechanical and heat resistance, and are used in the nautical sector and general industry (containers, pipes, etc.), where low weights and high resistances are not fundamental. The average cost is less than a third compared to the epoxy resins. C4 uses only the best epoxy resins for its products, as the use of economical materials lead to low results in terms of performance. For the fibres, C4 uses carbon fibres and R glass fibres, highly resistant materials that actually realize blades with low energy consumption (small hysteresis loops). There are other fibres that can be coupled with thermosetting resins, such as the aramid fibres (Kevlar made by Du Pont) and polyester yarn based fibres (Diolene, Diolen, etc.) These have an opposite elastic behaviour compared to carbon fibre and absorb energy during deformation without returning it (large hysteresis loop). The aramid fibres are used successfully as anti-projectile coverings because they absorb energy, as opposed to what is needed in the flippers. The only use for polyester based fibres (Diolene) is that they are easily coloured in black and look like carbon, whilst costing 5 times less. They are only compatible with polyester resins, and can create objects with a carbon “look” at a low cost. However, the mechanical performances for each unit of weight are distinctly lower. There are different types of glass fibres, but the R type used by C4 is the best available. It is highly resistant, costs accordingly and is compatible with epoxy resins. The S glass, normally used in the nautical sector, has lower costs and performances, and is compatible with polyester resins. Using the best materials is the basis for creating an excellent flipper. Following the success of the C4 flippers, there are now various composite flipper proposals on the market. Some of these use economical resins and fibres, retailed at similar costs to ours. The best athletes in the world continue to use our flippers without being sponsored, which proves that C4 does not even have to demonstrate the efficiency of its flippers.
Customers who purchased C4 C4 Falcon Blades (pair)
Customers who viewed C4 C4 Falcon Blades (pair)
LET US KNOW YOUR OPINION
C4 falcon 25
This is the best blade for freediving. I have tried and owned lots of fins ( Spora carbon. C4 f 80, Cressi, Picasso, M-technic ....) and nothing comes close Umberto Pelizzari use this blade !!
C4 carbon falcon 30
Very best fins ever tried!!! Nothing comes closer. I own also the Spora Carbon Pure, but these fins (C4) have no equals. Need to have strong legs to obtain the benefits but you notice the difference, especially when you are diving deep and need to "take off" from the bottom. You'll find nothing better.
The c4 falcon blades for freediving
Chris engelbrecht, copenhagen
These blades should only be purchased for freediving & apnea, and not for scuba. The carbon material gives the best propulsion available, but be careful with your purchase. The carbon fibres break more easily than your average plastic fins, so don't throw them around on the boat or let them lie loose in the trunk of your car!!! Treat them like a baby, and you'll get some very good freediving out of them. On the various models available: * Falcon 25: Long blade (freediving length), very soft blade, little propulsion (relatively), weak legged divers could need this (short people, beginners, etc.) * Falcon 30: Long blade, normal stiff blade, good propulsion, good for hour-long fishing * Falcon 40: Normal long blade, very hard blade, best propulsion, good for deep diving * Falcon 80: Extra long blade (+4 inches), very soft blade (like F25), bigger blade surface, good propulsion for weak legs, good for deep diving if you aren't strong in the legs (worked for me!) And yes, these fins are the choice of one of all-times best freedivers Umberto Pelizzari. For the deep attempts he has used the Falcon 40, for more recreational freediving I believe he prefers the Falcon 30. For deep freediving & spearfishing, trust me, these are the best!!!
How long are the carbon 80. blades
I bought a pair of falcon 25 last season and gone below 50 meters several times with ease thanks to the this outstanding fin.
I emailed before but you didn't reply. I would like to know what size you recommend? Normally I´m a size 44-45. I would like to fit a 3mm sock in to them and still be able to use them whitout anything. Someone that have an idée? (Thinking of the C4 footpocket)
Vukajlo iz cacka
Da imam love u steku kupio bih C4 momentalno,ali posto nisam u toj situaciji zadovoljicu se i SPORASUBOVIM PURE GRAFIBER perajama.
Hi everybody! I'm not a professional diver - just waterman having a small firm that produces hand-made sport equipment for water sports (kayaks, canoes and paddles made of glass and carbon fiber plastics. Recently we developed and manufactured the glass-fiber fins – they look and feel interesting. The main reason of turning to glass-fiber plastic is that all thermoplastics show afterflow. It would be interested to know if any of you have has some experience of glass-fiber fins? Are they worth developing further and commercialization? Regards, JK
Glass-fiber fins. jk
What do you want to know . Im working with compsite materials.