From reading various sources it seemed that a larger prop turning slower would give a more efficient transfer of the power.
Also, I have heard that running the motors at lower rpm under load results in undesirable heating, thus the choice of a higher gear ratio. I found a listing in the Michigan Propeller catalog showing that there are some Evinrude & Johnson outboards with 2.42:1 gears. Since I am starting from scratch, not having an existing outboard in hand, thought I might look for one of those.
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Posted by: John Acord <jcacord@gmail.com>
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