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Originally Posted by sciguy125
Aside from the actual speed that the piston moves (I hadn't thought about that until now), I don't think that it would be practical to launch the balls this way.
E=0.5mv^2
To get the ball to 12m/s, we need to supply it with 13J. This assumes no spin and minimal friction losses.
W=Fd
A 2" cylinder at 60psi will be able to give this 13J with a ~6" stroke. That's a huge volume of air. Your fire rate wouldn't be that great.
Of course, if your goal isn't the full 12m/s, some pneumatic mechanism might work for you.
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using F=M*A and V=A*t my calculations indicate you only need 19 lbs of force over a distance of 6" to accelerate a 0.175 kg ball up to 12m/s
the acceleration is 480M/S^2, and the time to get from 0 to 12m/S is 25mS