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Well ... fast forward 18 months. Decided that my interests were a little on the expensive side and decided to stay abroad a while longer doing overseas work to help the piggy bank out.
I came across something that has some interesting hacking possibilities. it seems that someone has fitted a battery operated hydro-jet module to surfboards to help surfers get through the breakers. Very sleek. www . wavejet . com (sorry for the spread-out link. I'm not allowed to post URLs yet)
Popular Mechanics happened to mention it as well.
20lbs of thrust for 39 minutes in a 17lb modular package. No additional specs are available that I could find ... but it does raise some interesting possibilities that might be worth mimicking in some form or fashion.
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