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Unread 11-01-2012, 22:12
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Re: "Pitching Machine" motors

Quote:
Originally Posted by dellagd View Post
Doesnt that all depend on how much backspin you want? Elaborate please.
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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