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Project a object at variable distances/trajectory

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Duane Degn:
As jwatte suggests, the irregular shape of the rocks will likely cause trouble in an air cannon unless you use some sort of sled.

An alternative which may be easier to implement would be to use a servo catapult.

Here's one made by a friend of mine.

Servo Catapult

He added an auto loader here.


If you used one of Dyanamixel's fancy servos, you might be able to weigh the rock by using its torque feedback feature. You could then adjust the speed the servo moves based on the rock's weight.


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