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Old 18-11-2012, 20:26   #1
LPL
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Fuel Consumtion on Marine Trader 38

Any ideas of fuel consumption per hour on a Marine Trader 38 with twin Ford Lehman 135HP. What about a very similar trawler with twin Volvos with similar HP. Lastly a similar 38 foot trawler with a single Ford Lehman 135HP. Trying to compare 3 boats and trying to figure the difference in fuel consumption. All 3 are 38' Taiwanese boats. Obviously not looking at top speed, but fuel efficient cruising speed.

Thanks
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Old 19-11-2012, 08:14   #2
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Re: Fuel Consumtion on Marine Trader 38

I have a Mainship 34 with a 270 Cummins, and she'll use 1.75-2 gph at 6.5-7kts. I would expect the Marine Traders to be similar, with the twin engine boats using slightly more fuel. I would also expect fuel consumption to start increasing significantly over 7.5knts as you start approaching hull speed and are pushing more water. Fyi, my boat used apprx 9gph at 13kts.
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Old 19-11-2012, 09:52   #3
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Re: Fuel Consumtion on Marine Trader 38

Similar trawlers with similar lengths will use about the same fuel at the same speed, except that the single engine boats may use about 15-20% less than the dual engine boats.

Fuel consumption is more dependent on cruising speed than anything else--if you don't like the burn rate, slow down half a knot. FWIW, I burn about 4gph at 8k with twin 200hp Leyland Fords, and that's good enough for me.
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Old 19-11-2012, 10:22   #4
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Re: Fuel Consumtion on Marine Trader 38

Thanks for the replies. That's what I needed. I've been getting estimates that are all over the board. I do realize a slight increase in speed can greatly increase consumption. Do trawlers generally run their generators while under way? I would think the engine alternator and inverter should be able to handle an AC fridge. What is the norm?
Thanks,
Paul
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Old 19-11-2012, 10:38   #5
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Re: Fuel Consumtion on Marine Trader 38

Paul
Yes the alt should handle your power needs unless you wish to run the AC while underway . My experience with the lehmans is the less RPM the less fuel simple
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Old 19-11-2012, 11:11   #6
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I have twin EH700 Hinos 175 HP NA in my Bayliner 3870. I've averaged 3 gph including gen time the last 3 years. Each trip I usually run a bit at wot to make sure everything is still working as it should. Mains average 90 hours a year & gen 65. I could do better if I stayed at 6.5 - 8 mph all the time, but sometimes I have to get on step to pass a tow or to get thru a lock without a long wait. I normally run at 1200 - 1500 rpm, half my time is with the current & half against, 3000 rpm is wot.
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