There is a lot of info out there if you know where to look. I'll send a PM. Anyway stack is heavily related to string angle at full draw as John says. Tip wedges are your friend here in a LB. Hooks in a RC do the same thing. Speed, noise and shock are all related mostly to efficiency. You can maximize all three with a stiff tipped, light but rigid limb design with a rather compressed working portion of the limb. A couple of design characteristics that help: confine most of the bending to the outside of the middle third away from fades but well inside tips, deep stack, narrow limbs are generally faster, quieter and less shocky than shallow wide limbs in the same design. This is because glass or carbon is heavier than wood in general and narrow limbs have less glass and are usually lighter in mass for their draw weight. Reduce mass as much as possible in the part of the limb that is moving. You want it to take off and stop quickly. Shock and noise occur when the limb moves too much after the arrow is gone. You want a lot of preload on your limbs. A higher portion of the total draw weight in the early part of the draw cycle is always good. This is the antithesis of stack. Think of it this way, early weight is the tail end of the power stroke. You want the bow to push the arrow hard all the way to brace. Stack only pushes the arrow at the beginning of the power stroke. Now you are wondering what a limb with these characteristics looks like? The fastest quietest most shock free rigs I have built, or seen for that matter were 64" RDLBs with skinny, skinny but deep limbs and about 13 inches of working limb from the fades to the tip wedges. A static tipped 60" RC with narrow limbs, and about 10 inches of working limb is a close second, but this design will test your patience. I built 7 forms in one summer before I had one I liked.
Bonner
Topic: Who can school me on bow design? (Read 606 times)
