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Re: Pnuematics?
That cart looks to be powered by either a pullback motor or rubberband drive of some type.
During the Mission Mars challenge one mission required the delivery of a ball into a container so it could be launched "back to earth". Our team accomplished this by carrying the ball in a container with a pneumatic trap door type device that allowed the bottom to drop out and the ball to be fall through. The biggest issue I found with the pneumatics is that the piston, switch and tank all have to be placed on the robot and attatching the switch to a motor (if that is how you want to activate it) can be difficult if you want any other type of motorized device.
The various pullback motors on the other hand i have found to be very useful. They were far more useful before the rule that requires the robot to leave base before completeing missions, but with a bit of inovation they can still be quite handy.
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