.The force that the bands exert is proportional to the extent to which they are stretched. For this experiment, it is NOT the draw length that matters ... that is, the distance from the pouch to the middle of the fork.
What IS important is the distance from the pouch to the fork tip. So to maintain constant force from one slingshot to another, one needs to draw each so that the pouch to fork tip is the same in each case. Then if elementary physics still operates, the wider fork width will yield slower velocities; consider the force vector along one band as being resolved into 1: a component from the pouch to the middle of the fork tips, and 2: a component perpendicular to the first, along a line from the middle of the forks to the tip to which the band is connected. The wider the fork, the greater 2 will be and the lesser 1 will be. It is 1 that actually drives the ammo. In other words, the wider your forks, the more band power is being wasted.
As a graphic illustration of this point, suppose in the extreme case you made the fork tips of the wider slingshot so wide that the bands were stretched to the draw length of the narrower slingshot. Then to keep the band stretch the same for the two slingshots, you would not be allowed to draw the pouch back at all. Hence, the ammo would go nowhere ... zero velocity. All the force in the wide slingshot would be directed along vector 2.
However, if you always use the same draw length, then the bands on the wider fork are actually being stretched more than the bands on the narrower fork. That extra stretch will mean the bands will exert more force on the ammo, although a bit of it will be wasted. If the extra stretch outweighs the loss due to vector 2 above, then the wider forks might indeed give higher velocities.
In Bill's case, he was using the same draw length each time, so the bands on the wider fork were being stretched more than when the same bands were on the narrower fork.
Cheers .... Charles
I think it was because John was pulling to the bands maximum length, while Bill was pulling to a set draw length for both.So why was John getting slower results? I thought he was using a consistent draw length, too?
Not trying to rattle you, unless I am misunderstanding you...?........ You adjust the tubes or the flatbands to accomodate your choice of forks in combination with the hold time......... Narrow forks with speed of release will knock the snot out of anything else out there.....
Heres a tip. The ammo leaves tbe pouch at a different point with wide vs narrow. So you go figure the rest out now.