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Old 08-01-2012, 10:02 PM   #13
Marin
Scraping Paint
 
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Join Date: Oct 2007
Posts: 13,745
Camano is also, of course, a semi-planing hull.

Toward the end of its run the standard engines in a Grand Banks 42 were a pair of 400-something hp Cats. These engines can push the GB42 along at a sustained cruise of some 14-15 knots. Of course they burn some 23 gph to do it. But at about 9 knots, the same engines burn about 7 or 8 gph.

Even our old GB36 with it's two FL120s can get well over 9 knots at full throttle, but you wouldn't want to do that very long. We did it for just a few minutes once to get rpm data for the prop shop that was going to rework our props. Other than that, the engines have never been above 1800 rpm in the last 14 years ( we cruise at about 1650).

I think you find that in the production cruising boat world there are actually very few displacement boats. Most, like Grand Banks, are semi-planing or, in the case of boats like the Eastbay, planing.
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