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What size should it be?

Old Marine Engine » One and Two Cylinder Gas Inboards » What size should it be? « Previous Next »

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Mark Widmer
Posted on Wednesday, December 10, 2003 - 12:59 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

I am currently in the processess of building a 24ft picnic launch. The plans refer to an electric 3hp motor. I would like to use a hit'n miss. What size would be best and what type? I want an engine which would not so unique that I would not be able to repair and maintain.

Any suggestions?
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Tom Stranko
Posted on Wednesday, December 10, 2003 - 07:21 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

At 12 volts the current for 3 HP would be about 185 amps (not counting losses) -as I recall.
You can't put an older outboard motor on it?
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miro
Posted on Thursday, December 11, 2003 - 05:36 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Based on 24 ft and 3 hp, yu'd like to see a propeller with a dia of about 12-14 in and pitch of about 14-15 in. The engine should be making about 700 -800 rpm. Having a bit more power ( say 4 or 5 HP) would let you run the run at less than full throttle.

Miro

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