Here's another take on that idea that avoids the "waggle" factor and has some interesting possibilities for improved efficiency over a prop and (since I sail) a fairly no-drag solution as well.
http://techtv.
-Keith
--- In electricboats@
>
> Did some searching and found this YouTube video of his boat.
> http://www.youtube.
>
> And the official page with plans. http://www.harrybry
>
> Note the two skegs. These are required to turn the fin's wiggle into forward motion by resisting the boat from wiggling. You want to wiggle the tail, not the dog.
>
> I see no reason why an electric motor couldn't drive an oscillating mechanism that would pull on the two cables like his design shows.
>
> Or, my simpler idea, with a disc mounted on the motor, with an eccentric that would push/pull on a rigid pole mounted on one side of the fin as the disc turned.
>
>
> --- In electricboats@
> >
> > Victor , I have the plans for the Harry Bryan "Thistle" which is a Fin boat.
> > Its peddle powered , so its probably quite feasable to have a battery powered auxilery electric motor on it , possibly with a hand powered clutch to engage/disengage.
> > Regards Rob J.
> >
>
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