> > Wonder why they use compress air to fire water out, rather than
> > simply using a pneumatic ram to lift the arm?  The water looks
> >  more exciting to spectators I suppose.

> Squirting water through a nozzle is much more predicatable and a much
> safer way to do it!

NASA have this natty launcher at the ADLF facility. Uses a water
cannon instead of rockets. Supposedly costs only $25 per launch

http://lisar.larc.nasa.gov/UTILS/info.cgi?id=EL-2002-00456

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