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post #1 of 6 Old 03-26-2013 Thread Starter
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diesel usage per hour

I have just purchased a 2003 hunter 44DS which I will fly to soon to sail home approx 600nm. I am planning my journey allowing an estimate of 6nm/hour but there is a section of nearly 40nm were I will probably have to motor. Can any one give me an estimate of how much diesel fuel per hour that a Yanmar 56hp motor will use. Thank you
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post #2 of 6 Old 03-26-2013
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Re: diesel usage per hour

The rule of thumb is 1 gal per hour for every 18hp used - i.e. at 75% of RPM that 56hp motor is likely burning about 2 gal per hour.
Yanmar probably has power and fuel consumption curves available at their web site. Keep in mind it all depends on bottom condition.

I would not use 6 kts as your estimated speed especially over a 600 nm passage. A more reasonable allowance would be 5 kts based on experience of other cruisers (another general rule of thumb), and even that would depend on average wind speed where you are traveling.

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Re: diesel usage per hour

A quick search found a passport 40 repowered w/ that engine averaged 1.16 gph @ 7.1 kts motoring between Newport RI and Miami on the ICW.
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post #4 of 6 Old 03-26-2013
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Re: diesel usage per hour

Chuckles, not sure that rule of thumb is linear. Our 100hp Volvo burns approx 2gph.


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post #5 of 6 Old 03-26-2013
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Re: diesel usage per hour

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Originally Posted by Minnewaska View Post
Chuckles, not sure that rule of thumb is linear. Our 100hp Volvo burns approx 2gph.
I'm quoting John Vigor on that one. (The Practical Mariner's Book of Knowledge (page 71))

No experience above my Westerbeke 30 - which burned 1.12 gals at full RPM per the manufacturer.

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post #6 of 6 Old 03-26-2013
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Re: diesel usage per hour

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Originally Posted by AKAPeterc View Post
I have just purchased a 2003 hunter 44DS which I will fly to soon to sail home approx 600nm. I am planning my journey allowing an estimate of 6nm/hour but there is a section of nearly 40nm were I will probably have to motor. Can any one give me an estimate of how much diesel fuel per hour that a Yanmar 56hp motor will use. Thank you
See Yanmar Fuel Consumption

On your 39' WL, I'm guessing you should average just shy of 6 Knots probably running at about 2800 RPM with a fuel burn of about 1.7 GPH. Considering the fuel capacity of that yacht, reportedly 51 gallons, assuming a 20% reserve your range under power along would be about 416 miles.

Despite the foregoing, do your own math with your observed RPM and actual boat speed with due consideration of tide/current effects as to VMG vs Burn Rate.

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