Sunday, November 22, 2009

Re: [Electric Boats] Alternative to propeller

 

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.mit.edu/videos/650-proteus-the-penguin-boat

-Keith

--- In electricboats@yahoogroups.com, danbollinger <no_reply@...> wrote:
>
> Did some searching and found this YouTube video of his boat.
> http://www.youtube.com/watch?v=3PdOIXvfB3g
>
> And the official page with plans. http://www.harrybryan.com/harrybryan/ThistlePlan.html
>
> 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@yahoogroups.com, Rob Johnson <dopeydriver@> wrote:
> >
> > 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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