--- In electricboats@yahoogroups.com, "williamwlow" <wmwlow@...> wrote:
>
> I am searching for info on how to replace a gas Palmer 8hp with electric drive to a 3/4 shaft inboard. Any info would be greatly appreciated
>
Look in the file "Building a Javelin.pdf" for a simple conversion job. The Javelin installation is only 3/4 horsepower, but the same setup would work for higher powers, just need switchgear and cables rated for more amperage, or use higher voltages, the Javelin is 12/24 volt.
Thumb rules indicate about 1 horsepower per ton of displacement to reach nearly hull speed, of course this is with a reasonably efficient propeller setup. I would think about 1-1/2 horsepower would be good for your boat, 24/48 volts (4 x 12 volt batteries) with a large slow speed prop, preferably 18 - 20 inch diameter at around 400 RPM.
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