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Old 02-22-2014, 02:14 PM   #1
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Mainship 34 Fuel Burn Rate

Hey guys,

We're going to charter a Mainship 34 out of Anacortes this fall. I Started doing some planning and was unsure about the fuel burn rate we should expect. Please chime in if you can offer some advise. It has a 330hp Cummins with a cruising speed of 8 knots at 2800rpm.

Thanks
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Old 02-22-2014, 03:33 PM   #2
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8 knots and 2800 rpm does not sound right. I think one of the numbers is incorrect.
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Old 02-22-2014, 06:08 PM   #3
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As jleonard noted, one or maybe both of your numbers is incorrect.

But in any case, here are a couple of data points from our 2006 Mainship 34T with the Yanmar 370 engine. The fuel burn and speed numbers will be close for the Cummins engine, but the rpm numbers will be lower for the Cummins by about 10%.

1,700 rpm, 3 gph, 7 kts
2,800 rpm, 12 gph, 12 kts

FWIW those are the best two points to operate that boat at. The 7 kt speed is near displacement speed and gives you good fuel economy. The 12 kt speed is a bit over the hump and any faster is loading the engine too much IMO.

And also FWIW the Cummins QSB 330 hp engine is rated at 330 hp at 2,800 rpm. I wouldn't cruise it any faster than 2,500, but I won't tell; it is between you and the owner.

David
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Old 02-22-2014, 07:11 PM   #4
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I have 50', a 250 hp Cummins and cruise at 1200 rpm, 7-8 knots.
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Old 02-22-2014, 07:55 PM   #5
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This might help ... from archived 2007 Mainship website:
Mainship Trawler Charters

Click on the engine type below the fuel efficiency overview to get more details.
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Old 02-23-2014, 12:45 AM   #6
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Quote:
Originally Posted by jleonard View Post
8 knots and 2800 rpm does not sound right. I think one of the numbers is incorrect.
Yep....2800RPMs on a 330hp 6BTA is redline! and will be burning about 16gph I would imagine.
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