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Old 01-08-2018, 11:26 PM   #1
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Fuel Figures

Peoples

Just returned from a trip down southwest Western Australia, nice travels, This is my first long trip. I would like to share my fuel consumption figures to see how the compare with others on similar boats.

Total distance in nautical Miles = 329
Total Fuel usage for generator and main = 1188L or 314US Gallons

Mostly at 10knots 1250 rpm = 21 hours
other time spent at 1850 rpm for about 18Knots racing ahead of weather.

Boat is SD at 48feet single screw 825hp FPT tier IV

I am pretty happy with these numbers.
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Old 01-09-2018, 02:11 AM   #2
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I think those numbers are excellent considering genny plus a sprint for a bit. Overall a shade over 1 nmpg. The boat must be relatively light?

I am 50' SD hull with 2 x 200HP, displacement a bit under 30 tonnes. I can get 1.5 nmpg (US Gallons) if I run at 8 kn. Running at 8.5 or so I drop to 1.2. I rarely run at 10kn, and would be under 1 in that case.
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Old 01-09-2018, 07:34 AM   #3
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My 45' 45,000 pound semi displacement trawler could cruise at 14 knots with a 1.5 gallons per mile fuel burn. Originally it had a 450 HP Cummins. Repowered with a tier 2 135 Hp John Deere and now cruise 7 knots at 3.5 MPG.

Ted
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Old 01-10-2018, 07:09 AM   #4
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Ted, did you ever measure the fuel burn with the stock engine at 7K/
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Old 01-10-2018, 08:54 AM   #5
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Quote:
Originally Posted by FF View Post
Ted, did you ever measure the fuel burn with the stock engine at 7K/
3.5 to 4.0 GPH or <2 MPG at 7 knots. I think Ski's boat does a lot better with the same engine at that speed because he displaces a lot less. Before I changed the prop, I was getting 2 GPH with the John Deere. It seems to me that the Cummins was real inefficient at 1,200 RPM.

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Old 01-10-2018, 09:07 AM   #6
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I've got the dyno data for the 450C and down at like 40-60hp it is certainly not as efficient as the Deere 4045 making the same hp, but it is not that much worse. I can look it up and crunch numbers if desired but if I remember right it is about 15hp/gph. Not stellar, but not horrible.

I tolerate the less than stellar BSFC for hull speed running as a good bit of my travels are at 200-250hp, right at the sweet spot of the engine making a solid 20hp/gph and running in the 20kt range. Depends on how much money I feel like burning!!!
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