The Physics Behind the Insanely Dangerous Japanese Water Jetpack

PopSci's Adam "Easy Joke" Weiner has worked out the physics of a super crazy Japanese water jetpack. Science is cool and all, but I just like watching this guy get tossed across a lake.

Essentially, this poor bastard left the launching pad at over 320kph due to the pressure of the water built up in the pack. It looks like he's using 25 two-litre bottles that tossed him about 25-30 metres. Unfortunately, he didn't calculate the rate of crap entering his pants during his flight, but maybe that's a job for a physicist with less scruples. [PopSci]

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