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Originally Posted by Orion
I've pondered the air vs. water prop and it seems that the disadvantage of an air prop is travelling upwind at which point you'd need higher revolutions to achieve the same through-the-water speed. We generally don't deal with water currents on the lake so it wouldn't be a factor with a water prop. Either way, some very interesting craft have been built as evidenced on that site.
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Yup, it would be bad to have no (tail) wind on the way out and have to fight a head wind coming back to homeport
Certainly a point in favor of the water-prop. Then again maybe the answer is something completely different. The pump cycle thingee on the site B.I. gave (thx B.I. !) got me thinking
I've read that fish are more efficient, at least at low speeds, than prop/screw driven craft. Given any HPB is going to be low speed and given the low power output I can generate, efficiency is paramount. I'd heard about the "RoboTuna" but not the below until recently. If you're going to build something, might as well make it unique
http://www.rbbi.com/folders/tech/product/penguin.htm