Part of the problem is that you can't really test the output of the prop sitting at the dock. The top-end RPM will be lower than if the boat was in motion IIRC. The torque and performance curves of two-stroke and four-stroke engines is very different and it is hard to compare them directly IMHO. Also, if you're not getting to the manufacturer's recommended RPM range for WOT, how is it that you expect to get the full HP out of the engine. The missing two HP that you're complaining about is probably provided by the 1700 RPM that you're short of the WOT recommended range by.
BTW, I have both a 20 HP Honda four-stroke and a Tohatsu 3.5 HP four-stroke outboard engines.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.
Last edited by sailingdog; 09-19-2007 at 05:07 PM.