Anyone can paddle a canoe in a pool. It doesn't equate to what I would
call unidirectional thrust. I know that this device does it from inside
the canoe, but that just requires a non-linearity in the interaction of
the boat and water with thrust. I bet that the water takes off the other
way ... equal and opposite reaction. I can do the same thing sitting on
a chair and jumping across a room.
-- Ray Tomes -- http://www.kcbbs.gen.nz/users/rtomes/rt-home.htm --
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