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The potential for efficiency is there with the fin. Fish are quite efficient using them. In fact, I have seen several web sites where in other nations they are experimenting with fin type propulsion systems for large vessels, and getting quite good results in terms of efficiency and propulsion.
> The September 1996 issue of Woodenboat had an article about Harry Bryan
> which included pictures of a fin-powered boat he builds. It is probably
> not as efficient or fast as a pedal-driven propeller, but it seems to
> offer the additional advantage of totally hands-free operation. I believe
> that the boat could be propelled and steered using just the foot-powered
> fin. As a fisherman, this aspect appeals to me. I hope to build a boat
> with a similar drive system in the future.
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Guillemot Kayak - High
Performance Wooden Sea Kayak Designs
