Suggestion: Pneumatic Powered Enginegreenspun.com : LUSENET : Junkyard Wars : One Thread
(Note: Not an engine as in locomotive, but engine as in engine -- or motor, if you will)
Similar to a steam engine, except that compressed air, rather than steam, is used to drive the cylinder(s) of the engine. An equal compressed air source could be provided for each team. There are many steam engine enthusiasts (and relatively simple designs) so finding an expert shouldn't be that hard. Make the task something like the coffee bean grinding task or simply measure RPM or torque.
-- tBoy (email@example.com), March 07, 2001
Maybe a steam shovel that has to dig at least 10 feet?
-- Eddie Gene Warren (firstname.lastname@example.org), March 12, 2001.