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Fuel economy while motorsailing
Another thread discusses sailboats motoring "too much" but I think most
sailboats will use their engines to supplement sail but we still worry about fuel economy. Even motoring alone, my yanmar 2GM seems to burn only about 1-1.5 gals/hr at 6 kts in my 28' S2 but still I wonder about the best way to conserve fuel in very light air. Normally, in light air, I start with sails and no engine and eventually get impatient with going only 3 kts and start the engine and put us up to 5 and then eventually 6 kts or more. It is this last little bit that I think burns the most fuel because she is most efficient at slower speeds but as we get closer to hull speed fuel use rises sharply. An alternative strategy that would burn less fuel but would go a little slower might to be ALWAYS run the engine at sufficient rpm to get to 3.5 kts and then use the sails to supplement that. |
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