KOCA (konstantinos carbon)
Is a leading fabricator of carbon fiber dive blades and spearfishing equipment products. Our passion for innovation and creativity is what makes our blades the best of what there is in the sea. Tested by numerous elite divers in real time under the toughest conditions. Its and single pair of blades is tested in sea before the final ok. That provides the top quality control of our products. Its pair of blades has a protective film of wax on it that will go on time.
AS A SERVICE, KOCA DESIGN WILL EXCHANGE TO THE ORIGINAL REGISTERED OWNER OF AN IRREPARABLY DAMAGED KOCA DESIGN PRODUCT NOT COVERED BY THE PRECEDING WARRANTY AT A SUBSTANTIAL COST REDUCTION. KOCA DESIGN WILL EXCHANGE THE RETURNED DAMAGED PRODUCT FOR A NEW ONE OF THE SAME SIZE AND THE SAME OR COMPARABLE MODEL. PLEASE CONTACT YOUR KOCA DESIGN DEALER FOR CURRENT DETAILS REGARDING REPLACEMENT TERMS. THIS OFFER APPLIES ONLY TO THE ORIGINAL REGISTERED KOCA DESIGN OWNER AND EXPIRES TWO (2) YEARS AFTER THE ORIGINAL DATE OF PRODUCT PURCHASE.
KOCA ADVANCED CARBON CONSTRUCTIONS
Grades of Carbon Fiber
There is a lot of marketing techno-babble out there with all the different companies getting on the carbon bandwagon. The idea is to try and convince the general public that they are using something special by using technical terms that have little pertinent meaning. The real differences are fairly simple.
Almost all carbon fiber is made from a common industrial fiber called polyacrylanitrile fiber, also known as PAN. Most PAN fiber is used to make acrylic fiber. It is also used to make carbon fiber with a pyrolizing process, which means it is heated to ultra high temperatures to remove all elements except the carbon. Most carbon fiber is sold at this point and it has a tensile modulus of 33 million pounds per square inch (MSI). (Tensile modulus is a measurement of stiffness.) This 33 MSI fiber, if seen up close, looks like a a redwood tree trunk, with deep fissured bark. If processed further, the “bark” is stripped off, leaving a smoother round fiber that is smaller in diameter. More of these fibers can be packed into a smaller space, making it have a higher stiffness per cross sectional area. 42 MSI fiber is the result and it is informally known as Intermediate Modulus fiber or IM fiber. The benefit is that you can use less material to get the same stiffness and therefore a lighter structure.
Further processing can yield even higher stiffness fibers by making the fibers smaller and a little denser. These are fairly expensive, brittle and used sparingly. They are known as High Modulus fiber and are in the range of 55 MSI and higher. Many companies refer to 33 and 42 MSI fiber as “High Modulus” because they can’t get sued for false advertising by using this informal term. To understand the real grade of carbon fiber one needs to know the modulus of the fiber.
Fibers are bundled in various sizes designated in thousands (K) of fibers. 1K, 3K, 6K, 12K, 24K, 50K and others are common bundle sizes. These fibers are woven into fabric with various weave patterns. 3K fabric is most common. The various types of fiber will have the same “K” designation to indicate the number of fibers in the bundle. These numbers describe the size of the bundle used and have little to do with the quality of the fiber itself.
Of course there is more detail to describing carbon fiber, but the above describes the most important aspects.
KOCA (konstantinos carbon)
is a leading fabricator of carbon fiber dive blades products. here are the three major series and a price list.
carbon force series,
specially design for greater comfort during swimming ,where you need a softer blade and stiff enough at the bottom of your dive…. “double flip” effect Butterfly cut at the end. Length 760mm-width 200mm
MASAHIRO series available under special order,please contacts us for further info.
Masahiro, the famous samurai sword and its filosophy of :Gritsuke Gommen (kill and go away) is a more sophisticated blades in order of hydrodynamic efficiency with less power needed for the same amount of force ,compare with conventional blade fins the gain is up to 1,5 meter in a 25 meter pool . Comes in three different hardness , soft, medium soft and medium hard. Semi elliptic profile.
Round cut at the end. Length 760mm-width 200mm
venom series available under special order,please contacts us for further info.Specially made for athletes of free dive for deep sea dives.
Kamikaze series available under special order,please contacts us for further info.Specially made for athletes apnea for pool dynamique dives.
The ultimate carbon fiber blades for serious divers only. Recommended for advanced free divers with very high technic. In terms of hardness is like a medium soft blade but with a fully elliptic profile. The more it bends the stiffer it gets.
Round, upside down cut at the end. Length 800mm-width 200mm 380€
FOOTPOCKETS WE RECOMMEND PATHOS SUB FOOTPOCKETS
PRICE FOR FOOTPOCKETS 70€
ALL BLADES CAN BE MADE IN CAMO DESING or SHARK FIN TEXTURE WITH NO ADDITIONAL COST. MOUNTING ALSO THE BLADES IS FREE OF ANY GHARGE.
HOW TO CHOOSE Fins BY KOCA
These days there is a mind boggling array of fins for the diver to choose from. One thing is for certain, a freediver benefits greatly from a long blade fin with a fully enclosed heel.
Long blades produce more thrust for less effort meaning longer bottom times and shorter recovery time between dives. Closed heel (as opposed to open heal SCUBA style) footpockets give a more efficient transfer of energy from the ankle and calf to the blade again resulting in more "bang for you buck".
Footpocket brand is really governed by your footshape and blade by diving style and body strength.
GUS from TRIDENT-SUB kindly put this together for us:
The recent trend towards using higher performance materials like Carbon Fibre, and Fibreglass in fin blade production is causing considerable confusion amongst divers as they renew their fins. Some information to help you select the best fin blade for you follows:
Firstly some misconceptions.
Dropping hard objects onto blades and other such dramatic exhibitions are an improper display of durability, strength, or quality performance. Doing this will cause damage to any blade even if it is not noticeable.
Fibreglass & carbon fibre are very strong materials, but they are not indestructible. They can all be damaged, they will become stressed, they may become prone to osmosis, and they will lose their efficiency over time. They must be well looked after just like any other bit of equipment. They will eventually need replacing, although they will be more efficient for longer than traditional polymer blades.
Carbon Fibre is stronger, technically superior, and more energy efficient than fibreglass as a fin blade material. The efficiency improvement from carbon fibre over fibreglass may only be negligible for a diver of an average standard. Typically, only divers wanting to squeeze every bit of efficiency out of their performance should consider carbon fibre blades.
There are many variables more important in blade selection than the base material. Fin blade design is an essential component of a high performance fin. Essential features are:
A TAPERED BLADE - a blade should taper from the heal towards the tip in order that it develops a smooth consistent curve with a strong recovery memory once flexed.
AN ANGLED HEAL - allows for a natural, more energy efficient kick stroke in both the forward and backward thrust of a kick.
FLEXIBLE SIDE CHANNELS - work a greater amount of water, keep the blade in line, and prevent blade vibration.
BLADE LENGTH is critical to selecting the correct fin.
BLADES OF 80cm+ are more suited to freedivers or spearfishers who dive in a constricted area to great depths (greater than 30m). These blades require a greater level of technique and concentrated effort to achieve a fluid and efficient dynamic motion
BLADES LESS THAN 80cm are more suited to spearfishers that cover large areas and dive repeatedly to various depths. These blades have a sharp, more precise reaction, and they are easier to control and manoeuvre.
BLADE STIFFNESS - possibly the most complicated part of the selection process as there are a number of variables to consider. The objective should be to obtain the greatest possible performance whilst using the least amount of energy; and to also make you, the diver, feel comfortable and safe using it. The softer the blade the less energy required to work it so every diver should select the softest blade possible whilst taking into account their diving style, and psychology.
A large bodied diver may not feel comfortable and safe using a softer blade because it takes a little longer to achieve an acceptable level of momentum on ascent from a dive.
A diver with an aggressive diving style will likely lose patience with a softer blade.
A more technical style diver will achieve improved performance from softer blades.
Footpocket selection is even more important than correct blade selection. If your foot is uncomfortable, then you will be disappointed no matter what you buy. Rule of thumb:
o Very wide foot = Omer / Mat Mas Footpocket
o Wide/Medium width foot = Omer / Dessault Footpocket
o Medium Width foot = Omer-Pathos Footpocket
o Medium to narrow Width foot = Pathos Footpocket
o Narrow Width foot = Beauchat-Pathos Footpocket