Hondero recently mentioned that two standard lengths for Balaeric slings are:  Fingertip-to-Elbow, and Fingertip-to-Shoulder.

This makes the flexible "driven" part of the "slinging system" equal to the rigid "driving" part.   That is, one sling has length equal to a rigid forearm-hand combination that's flexible at the elbow.  The other has length equal to an upper-arm-rigid-elbow-forearm-hand combination that's flexible at the shoulder.

Could there be some "performance improving engineering magic" in making the driving and driven lengths equal to each other??

To extend the principle:  If I build a trebuchet, should the sling length be equal to the length of the arm above the pivot??

Inquiring minds want to know!   mgreenfield