Quote:
Originally Posted by Ninja_Bait
It's time for a free-body diagram explanation.
Bottom roller + hood:
Two forces: the force from the wheel and the force of friction from the hood. both work together to create backspin; friction works against the wheel to create forward acceleration.
Top and Bottom roller:
Two forces: The wheels work against each other, with the bottom wheel applying more torque to create backspin; the wheels work together to create forward acceleration.
So yes, there is a backspin consideration involved here - more backspin would be easier to get out of a hooded shooter. However, the wheel is forced to do more work, so you lose more momentum between shots, and can't shoot as far.
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Have you seen some of the shooters from 2006 with only 1 wheel? They could shoot pretty far, the only thing keeping them from shooting as far as they could was the speed limit the had that year...