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Is there an easy explanation how two different length bows with the same draw weight let off arrows at different speeds.
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- shorter limbs have less mass to accelerate (same reason as having 'foam' limb cores)
- with shorter limbs the limbs are bent more so there is more utilisation of the limb energy storage capacity.
- Shorter bow will generally have a lower bracing height - more useable energy stored at full draw with same draw weight.
- Shorter bow will have a more acute string angle with the arrow so force is more forward then up and down - short axle length compound bows take this to a much greater extreme then possible with a recurve because of release aid/loop.