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post #1 of 11 Old 02-12-2007 Thread Starter
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Fuel Consumption

what would be the expected fuel consumption, for a PERKINS 4-180 50hp in a cal 39. only has @ 50 Us Gallon tank. (cruising, not flat out)

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post #2 of 11 Old 02-12-2007
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There's a formula for this which I've long forgotten. Maybe Cam will know. My 65 hp ford-lehman pushing 37 ton displacement at 65% power averages 1/3 gal per hr at 5 kts.
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post #3 of 11 Old 02-12-2007
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my 4.236[82 HP] avgs between 1.25 and 1.5 gal/hr. The best solution is to measure your own burn. Fill it up. Write down the hours on the engine, cruise for a bit, fill it up again, look at the hour meter, calculate your real burn.

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post #4 of 11 Old 02-12-2007
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Quote:
Originally Posted by ianhlnd
My 65 hp ford-lehman pushing 37 ton displacement at 65% power averages 1/3 gal per hr at 5 kts.
I want your engine !! That's less fuel burn than my generator which is about a liter/hr and it's a 1 cyl 12hp engine...

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post #5 of 11 Old 02-12-2007
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My very ancient Volvo MD21A 56 hp sucks 3.5 litres and hour at 2000 rpm. So I guess about 1 US gallon an hour. (6 knots, 7000kg, 38 feet).
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post #6 of 11 Old 02-12-2007
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Very rough calculation (many many unknowns)
Fuel usage 1 gal/hr (+- 50%)
Speed 6kts (-1, +.5)
Range with 50 gals. 300 mi. ( The error estimate is left as an exercise for the reader)

That much power (50hp) could probably get a bit more that 6.5 knots, but it would be at the expense of really significantly more fuel consumption.
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It can vary tremendously based on RPM. Our Yanmar 4hj will more than double consumption between 1500 and 3000 RPMs

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post #8 of 11 Old 02-12-2007
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My 4-108 at under 2000 rpms... about a gallon an hour 6.5 mph. Push over that and at 2500 rpms you can almost double that 8mph (Hull Speed). Boat, 17000 lb 36 ft lod, 32 ft lwl.
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post #9 of 11 Old 02-12-2007
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Very hard to answer as it's based on LWL, hull shape, prop efficiency and power band. I will say that in my experience it's the last 1.5 knots before top speed that eats up the fuel. If you can push the boat 7 knots in flat seas below, say, 2,800 RPM (too bloody loud for me), you'll probably get best fuel economy at 5.2-5.5 knots and 1900-2150 RPM. Scale up and down as boat, engine and real life require.
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post #10 of 11 Old 02-14-2007
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Pathfinder

I have a 52 HP Pathfinder on my 24,000 lb fiberglass schooner, 33 ft lod + 12.5 ft Bm. It is slightly over-propped with an 18x15 three-blade, which I very much like because it keeps the engine around 1600 RPM, and she burns 0.5 GPH @ 5 to 5.5 knots, but goes up to 0.75 @ 6 knots and 1.0 trying to better that, without much more effect than a bone in her teeth and a wake. At 5 knots she slips through the water with hardly a ripple.

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