Maybe that's why Golden Motor makes them with water cooling, water pump inside the outboard motor housing, or could be inside the boat with hoses -- so do it right, for safety. I don't think air cooled would be as good, maybe more noise – I can hear the water rush by the stern at cruise speeds on a 18 ft cabin cruiser. Johnson 50 hp OB lower unit.
Later, Cal
Sent: Saturday, February 27, 2016 9:13 AM
Subject: Re: [Electric Boats] Why gear reduction?
My understanding is that your efficiency increase is from turning a larger propeller at slow speed. Running a fan cooled motor at lower rpm reduces the cooling and may cause damage. Getting the most efficient prop while keeping the motor cool is the goal.
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Posted by: "cal" <h20dragon@centurytel.net>
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