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01-08-2018, 10:26 PM
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#1
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Veteran Member
City: Perth
Vessel Name: Yarradeen
Vessel Model: Harriscraft 48
Join Date: Jul 2017
Posts: 79
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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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01-09-2018, 01:11 AM
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#2
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TF Site Team
City: Brisbane
Vessel Name: Insequent
Vessel Model: Ocean Alexander 50 Mk I
Join Date: Mar 2012
Posts: 4,262
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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.
__________________
Brian
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01-09-2018, 06:34 AM
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#3
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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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
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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01-10-2018, 06:09 AM
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#4
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Guru
Join Date: Oct 2007
Posts: 22,553
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Ted, did you ever measure the fuel burn with the stock engine at 7K/
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01-10-2018, 07:54 AM
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#5
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Guru
City: Fort Myers, FL... Summers in the Great Lakes
Vessel Name: Slow Hand
Vessel Model: Cherubini Independence 45
Join Date: Dec 2010
Posts: 12,834
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Quote:
Originally Posted by FF
Ted, did you ever measure the fuel burn with the stock engine at 7K/
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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.
Ted
__________________
Blog: mvslowhand.com
I'm tired of fast moves, I've got a slow groove, on my mind.....
I want to spend some time, Not come and go in a heated rush.....
"Slow Hand" by The Pointer Sisters
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01-10-2018, 08:07 AM
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#6
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Technical Guru
City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
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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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