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Harry Krause wrote:
My recollection is that BOATING magazine's "cruise speed" for planing boats is the throttle setting that produces the best fuel economy while the boat is on plane. Typically, it is somewhere around 70-75% of the engine's top RPM on a boat with a gas engine. and Gould 0738 commented: Actually that would not be correct. The greatest fuel economy with a planing hull boat (eliminating the "dead idle" option) is achieved just after the boat reaches plane. I think you are both correct but some tweaking of Gould's comment is required. Engine load and fuel flow rate won't be minimized simply by getting the boat on plane. Once on plane, proper trim of the boat via load distribution or engine, outdrive or tab trim will often result in an increase in RPM and speed for a given throttle setting. Properly trimmed and on plane, the ideal cruise speed (with best fuel economy) may be several knots or mph higher than the boats natural planing speed. Diesel engines are easy. The manufacturer's recommended cruising RPM on my boat is 200 below maximum RPM. Simple. Eisboch |
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