This produces a bow with a tiller between top and bottom limbs that varies by four pounds. In other words, the top limb pulls four pounds less than the bottom limb. With this design, any of my longbows will shoot a variety of differently spined arrows well, including graphite, carbon, wood and aluminum. My bamboo comes from Japan and it is tempered. It also reduces handshock and the bows do not stack.
Carbon has higher elasticity than fiberglass in tension.
It has very high tensile strength and low physical weight. Backing a bow limb with it enables the bowyer to increase tensile stress and reduce the overall physical weight of the limb. The effect increases the recovery rate of the bow, reduces stack and practically eliminates handshock. After years of experimenting with this combination, I have not found anything that compares. Limb stack and handshock are reduced, while smoothness, cast and speed are increased.