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Old 07-01-2012, 01:20 AM   #31
CPseudonym
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City: Hotel, CA
Join Date: Sep 2011
Posts: 8,323
Quote:
Originally Posted by markpierce

Art, that's not very efficient. The 35-foot, 28,000 lb. Coot does about 6.5 knots running its single 80 h.p. JD 4045DFM70 at 1600 RPM using 1.3 gallons per hours, or about five miles per gallon. Just don't ask it to exceed 7.5 knots, however.
My mind isn't into the math right now and don't have the power curve data on either engine but my best guess is the Coots Deere is putting out maybe 50 HP at 1600 rpm. Art's 350's won't see 255 HP at any less than 5500 rpm. Unless Art's engines have been rebuilt recently I doubt they'd reach rated HP output.

He's maybe 80 HP max on one engine at just over 2000 rpm. Still not nearly as efficient as the Coot, but a significant cost difference between powerplants and vessels too.

Sorry Art. A planing hull can certainly run more efficient at hull speed, but the displacement hull will still win the efficiency battle IMO. Nothing wrong with that though.
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