First of I know many people thinks speed is silly but I want to get past 500fps with at least 54grain balls (30 fpe which should be possible with a fast system) and have been looking for info on flight shooting and compounding but I can not find a lot of info...
As most people know we are losing efficiency with light ammo and fast speed.
Terotically so should the lighter ammo have the same energy as the slow heavy one but the bands can't keep up.
So too get high velocities we need too increase the efficiency with delicate taped bands, cutting down on weight and at the same time still sacrifice energy with unreasonably light ammo...
But with compounding we can "gear up" the speed of the bands, sure we loss some efficency as no gearbox has zero loses.
A typical compound bow will have a gear ratio of ~1:2 wich means simplified that a 70 pound bow does really have 140lb limbs and those limbs will only need to move half the speed as a recurve and on that they use cams to manipulat the force draw curve too put into more energy into the system.
So now is my question how do we do it and has anyone experience in this?
If we have a very wide fork would we not get a compounding effect like the rüdiger koltze crossbow? https://patents.google.com/patent/US5720268
Other systems that I know have been used.
Levers
Pulleys
Vacuum (not really a compound principle but it should have a optimal force draw curve)
I have got over 300fps with a recurve bow at 85fpe, but I don't think I will get any faster without some kind of compound system.
Any ideas is greatly appreciated!
As most people know we are losing efficiency with light ammo and fast speed.
Terotically so should the lighter ammo have the same energy as the slow heavy one but the bands can't keep up.
So too get high velocities we need too increase the efficiency with delicate taped bands, cutting down on weight and at the same time still sacrifice energy with unreasonably light ammo...
But with compounding we can "gear up" the speed of the bands, sure we loss some efficency as no gearbox has zero loses.
A typical compound bow will have a gear ratio of ~1:2 wich means simplified that a 70 pound bow does really have 140lb limbs and those limbs will only need to move half the speed as a recurve and on that they use cams to manipulat the force draw curve too put into more energy into the system.
So now is my question how do we do it and has anyone experience in this?
If we have a very wide fork would we not get a compounding effect like the rüdiger koltze crossbow? https://patents.google.com/patent/US5720268
Other systems that I know have been used.
Levers
Pulleys
Vacuum (not really a compound principle but it should have a optimal force draw curve)
I have got over 300fps with a recurve bow at 85fpe, but I don't think I will get any faster without some kind of compound system.
Any ideas is greatly appreciated!