Wednesday, May 27, 2009

[Electric Boats] Re: Electric power for over 30'



Tom,

That sounds like a small prop for your boat. I had a fixed 2 blade 11"x10" prop on my Ericson 27 and would get 3knts @ a 20amp draw and just over 4knts @ full power. I changed to a 12"x10" fixed 3 blade prop and now get 4knts @ a 20amp draw and 5.8 knts @ full power.

Have you tried different props?

Mark

-- In electricboats@yahoogroups.com, "tdmitrukowski" <tdmitrukowski@...> wrote:
>
> Tom I have a challenger 32' that displaces around 14000 lb. It also had a Perkins 4108. I converted it to electric this year. You can see the pictures in the picture files under the folder Second Wind. I built the rig myself from parts I could get cheap on ebay( with exception of the controller). I used 8 batteries for a 48V system. It should give me 250 amp hours of use. Minus all the losses its probably much less. I think it will run at 40 amps for over 3 hr ( I haven't tested it for this long yet) At 30 amps I get close to 3 knots at 80 amps I get about 4 knots. The prop I am using is a 12" with a 9" pitch and has three blades. My boat ispretty wide with 11' of beem that I think is thre reason for the large amp draw and slow speed. I think your boat will get similar results to mine as far as amp draw is concered and the speeds you can expect.
>
> Tom
>

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