Wednesday, August 3, 2011

Fuel Economy Anyone?

This boat is teaching me a lot about boat design. At normal cruise we burn about 2GPH. The boat has no stern wake. That's right, no stern wake. This is in a displacement boat which is the key, I believe, to good fuel economy. Last weekend we ran 1550 to 1600 RPM most of the time and averaged 7+ kts burning 1.7 to 1.8 GPH. The boat is "happy" at this speed and I think for the 48 this is the "sweet" spot. Running harder gives us little gain for a lot higher fuel burn.

2 comments:

  1. Um, is that 1.7 to 1.8 Gallons per HOUR? or did you mean "Gallons Per Mile" or "Nautical miles per Gallon?"

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  2. I am not sure if I ever answered you, my apologize. I just thought I could throw out a blog and forget about it. But, when I make comments like I tend to do, yes that is me, I hold very little back, I should at least be prepared to explain.

    Yes the numbers at 1500 rpm are 1.7-1.8 GPH, gallons per hour. Typically we can expect 6.8-7.2 kts, of course there are so many variables. I usually " flight plan" off shore at 6.8 and add in what I guess is thevcurrent and wind. Regardless the GPS is king at determining ETA.

    Sorry, this is months late but I never planned to respond, just post.

    Cheers, K&S

    Thanks for following, if you see us on the water on on a dock please come by.

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