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Old 02-24-2013, 08:12 PM   #21
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Originally Posted by Riverguy View Post

Just curious, how do most folks here determine fuel burn? Floscan?
Yes....I do.
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Old 02-25-2013, 08:01 AM   #22
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[QUOTE
Just curious, how do most folks here determine fuel burn? Floscan?[/QUOTE]

I calculate only after a long trip of several days and after I know I have previously topped off the tanks and have confidence I have a good handle on how much fuel I've used. That number will include everything...genny time, idle time, etc.
My recent nunber was based on a summer long cruise up thru the Trent Severn, Georgian bay, etc totalling 327 engine hours and 607 gallons of fuel, and I calculated 1.85 gal per hour with my Lehman 120 which seems to coincide fairly well with what I have seen others post.
(I could be off a little bit but who really cares?)
It's not a "true" representation of what the main engine burns, but tells me what I'll use with the way I boat.
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Old 03-15-2013, 02:59 PM   #23
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Do you know if this is true of the 2002 390? (about the platform having access points)
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Old 03-26-2013, 06:42 AM   #24
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Originally Posted by Dougcole View Post

Are you sure of this? There are quite a few mainships on the market, and it has been my recent experience that they are selling well below the asking price. We bought our boat at 45% less than asking. We had cash and found the right situation.

You could do the same.

Doug
Check the date of that post....over 2 years old!...
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Old 12-22-2014, 12:43 PM   #25
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390 Fuel burn

Quote:
Originally Posted by Riverguy View Post
Hi all, I'm new to the forum today, and I have a question I hope someone can help with.

My wife and I are looking at trawlers and one that we really like is the Mainship 390 with a single diesel engine. There is a 1999 review of the boat from Boating magazine posted at boatdiesel.com. The article includes extensive fuel-burn testing.

What got my attention is that the boat tested at 0.8 GPH turning 1200rpm and 8.5kts, yielding 10.6 nautical miles per gallon. This is exactly what we're looking for, but is it really true? Has anyone seen this kind of efficiency from the 390 single?

Here is the published test:

http://boatdiesel.com/Boats/Mainship...9201331&Page=5

Thanks in advance!
I get that or better as long as the current is swift and I leave the Main Engine off and don't put too much load on the generator.

2002 Mainship 390 Single Yanmar 370hp
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Old 12-22-2014, 10:43 PM   #26
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I get that or better as long as the current is swift and I leave the Main Engine off and don't put too much load on the generator.

2002 Mainship 390 Single Yanmar 370hp
:f acepalm:

No doubt. I'd like to see that. 1200 RPMs and 8.5 knots. I don't think so!!!
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Old 12-23-2014, 07:43 AM   #27
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If fuel consumption is a concern, start looking at displacement boats. At that size you can easily hit 8kts at 1.5 - 1.6 gph.
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Old 12-23-2014, 11:37 AM   #28
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That Mainship 390 should easily be in the 2-3 gph at just under hull speed, around 7-7.5kts.

It's a strange hullshape with built in hook and a not very streamlined keel. The hook will force bow down in the semiplaning regime, which is sorta nice, but the keel causes bad turbulence into prop making it very loud back there when running "fast". Not very efficient up there. Hard to decide whether to call it "semi-planing" or "semi-plowing".

But down around hull speed, it should get about the same speed vs burn rate as anything else in that size and weight class. Regardless of engine. Trawlers in the 35-40' range running just under hull speed seem pretty consistent in the 2-4nmpg range.

That 0.8gph at 1200 and 8.5kts is pure BS!!
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