Peculiarityof the carbon and its manifacturing

The main manufacturing peculiarity of FiberBow 5.99 Riser in carbon fibre is its stratified structure. This structure grant a high resistance to bending, stress and torsion. Our Riser has been manufactured with a tubular carbon system (that is a patented pending product); this is a tubular structure constituted by oriented fibres carbon coats so that they can contrast the traction and release forces and vibrations. The starting point is thin carbon filament, flexible and soft like nylon. It is stranded and woven just like a normal fabric, and after its interwoven we get the carbon fibre. This carbon fibre now is still flexible, so it is pre-soaked in epoxy resin. Now the pre-peg product is ready for the following step. The carbon skins are placed into the mould and this process is really important because the placement will give the fibres the mechanic characteristics needed. The carbon fibre is placed according to the main project, focusing in particular onto the Riser’s strain lines. Together with the carbon fibre, we insert in the mould some epoxy resin, a liquid stick that links the different skins. Once the mould is closed, it goes into an autoclave, where high temperature and pressure will solidify the fibres, making the structure adhere to it. The higher the pressure, the better the final result.

The 5.99 and the advantage of the “Stiffness to Weight”

What’s the Stiffness to Weight? It’s the bending of the material, in operation with its weight and shape. Talking about the 5.99, the stiffness to weight contribute to the arrow flight. That is because the arrow speed is the result between the speed of limbs closure and the riser closure. Having an active riser, we have a higher speed. The result is much more effective than just with the limbs action. With the stiffness to weight we have a higher boost just after the release, when the string is in its axis.
After the release, the acceleration due to the limbs boost will be constant. Thanks to the higher speed, the string won’t go out of its axis and this will result in less oscillations. In the FiberBow 5.99 the mass (riser) cumulates energy and then renders it as a boost (think about the longbow, where the riser is a whole thing with the limbs).
Talking about this riser, weight is one of the most immediate characteristics, but we should consider every single technical solution that took us to the 5.99. FiberBow 5.99: Simply amazing!

Another important step in the making is the varnishing.

It is realized with electrostatic techniques: the varnish is negatively charged, while the riser is positively charged. The riser attracts the varnish so that they cumulate evenly on it. While using your FiberBow 5.99 you don’t need to pay attention to the varnish. After a long time, vibrations may create very little and almost invisible cracks, but they’ve nothing to do with your bow precision and reliability.

Hollow tubular carbon structure

The material

The FiberBow 5.99 is manufactured using Full Total Carbon. The hollow tubular carbon structure is manufactured using unidirectional layers of carbon fibre to their best advantage. The carbon fibre is intrinsic to the design and is not just an outer skin covering an internal structure, which allows us to produce a strong, light, efficient and good-looking riser.

Vibration dispersion & greater accuracy

On a bow, the vibrations produced by the limbs propagate to the riser and then to the stabilisation. If by design these vibrations are also dispersed and dampened through the riser the result is a very quiet shot. It also means that less energy is dispersed in sound, that is, more energy goes in the arrow’s speed! Tests have shown that you may get up to 3-4% more arrow speed compared to a CNC riser.

After the shot, you always have a period of time where the entire bow vibrates, even if it is well stabilised and dampened. By using carbon fibres this period of vibration is surprisingly short reducing the need for over dampening of the stabilisation.

When using conventional riser materials such as aluminium it has been found that a heavier draw weight requires more stabilisation which means longer rods more weight and dampening. For many archers this results in a bow that cannot be fully stabilised because the optimum weight and overall length of the system is too much for the archer.

With a lighter riser, which also reduces vibrations, the archer has more options when it comes to stabilisation by being able to place less weight and dampening where it works best.

At this point it is important to stress that here we are talking about a light bow, not an unstable bow. Only the total weight of the bow is reduced not the stability, in fact by allowing weight to be removed from the stabilisation the bows stability is improved. For many archers the biggest benefit seen by the reducing the weight and stresses on the bow arm, is that the archer can focus more on the shot rather than trying to keep the bow arm up and extended. Resulting better control of the shot, less physical fatigue towards the end of a tournament or days shooting and greater accuracy.