I'm not laughing, I'm designing. (Yes, I have too much free time on my hands.) Running water is one of the most powerful things known to man.

Heck, if it can be run off water, the basic design could be modified so that it uses high pressure air. Like you'd get on an air bottle refill station.

Update: Found some air powered ones.
http://www.barnant.com/products.php?product=18
http://www.techsavvy.com/industry/file/n...p;base_region=* (scroll to the end)

And Northern Tool has everthing under the sun. Electical and air, and I didn't look far enough, but I wouldn't be suprised if they had hand pumped.
http://www.northerntool.com/webapp/wcs/s...matchallpartial