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Old 02-01-2012, 03:58 PM   #1
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Mainship 36

Tomorrow morning we will be seriously looking at a 1986 Mainship 36' Aft Cabin.

Question..........What is the hull speed for this boat and how economical (MPG) would*it be*at 6 to 7 knots with twin 270HP gas engines?

Coming from a sailboat, I know fuel will cost money and I have accepted that. I know it will be affordable but was just wondering about fuel economy.

*

Thank in advance

*

Tony B
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Old 02-02-2012, 10:12 AM   #2
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RE: Mainship 36

I don't know but I would think in the 3 - 5 mpg range.

Not considering a diesel?
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Old 02-02-2012, 02:48 PM   #3
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RE: Mainship 36

Haven't done the math on ours but I've been told that the blue 270's run about 6 gph per engine under 3,000 to 3,200K rpm (at which rpm the secondaries open up). *I'll get up to around 9-10 knts at just under 20,000K rpm. *The boat feels like the sweet spot is around 1,800 rpm. *When the secondaries open, I'm told that this jumps to 12 gph per engine per hour. *I have yet to get above 3,000 for any long period of time nor approach WOT.
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Old 02-02-2012, 02:53 PM   #4
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Mainship 36

Quote:
*

Question..........What is the hull speed for this boat and how economical (MPG) would*it be*at 6 to 7 knots with twin 270HP gas engines?
*To calculate the hull speed.

*Take the square root of the waterline.

If it is 36 that is* 6

multiply by 1.34 to get 8.04

There you go.

Faster than that and you are just pushing water and burning fuel.

SD

*


-- Edited by skipperdude on Thursday 2nd of February 2012 04:55:22 PM
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Old 02-02-2012, 02:53 PM   #5
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RE: Mainship 36

Quote:
Rick in the Delta wrote:
*I'll get up to around 9-10 knts at just under 20,000K rpm.
*Wow! Motorcycle engine?
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Old 02-02-2012, 03:56 PM   #6
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RE: Mainship 36

And FYI...it is a planing hull....or at least a semi-planing hull. I would recommend diesel!!!
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Old 02-02-2012, 04:10 PM   #7
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RE: Mainship 36

Oops! *Not paying enough attention to editing.......

*

The hull is "semi-displacement" which, of course, means it does neither displacement or planing very well. *The origional specs at at*http://www.mainship.com/models/previous_models/36dc.htm

I'm new to this boat, still, but I find the speed estimates a bit inflated and at the least they are expensive and working the small *blocks way hard.
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Old 02-03-2012, 08:20 AM   #8
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RE: Mainship 36

20,000 rpm - more like Formula 1... probably would burn about 20gpm :-D
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Old 02-03-2016, 10:20 PM   #9
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Interested if there are any more updates and new comments on this thread from current crusader 270 hp owners as I am considering the same boat and have the same questions. Clearly earlier poster meant 2000 rpm not 20000. Thanks in advance,
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Old 02-04-2016, 06:59 AM   #10
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Quote:
Originally Posted by timjet View Post
Not considering a diesel?
Quote:
Originally Posted by Baker View Post
And FYI...it is a planing hull....or at least a semi-planing hull. I would recommend diesel!!!

Old thread, but...


Don't think Mainship offered diesels in that model. At least never saw one advertised....

Our Mainship 34 Mk III was an '87 and their 34 models of that era were all single diesel. I never understood why they only (apparently, at least AFAIK) offered gas in the 36s.

There was a 40, too, but I can't remember engine options for those...

-Chris
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Old 02-04-2016, 09:06 AM   #11
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Old thread, but...


Don't think Mainship offered diesels in that model. At least never saw one advertised....

Our Mainship 34 Mk III was an '87 and their 34 models of that era were all single diesel. I never understood why they only (apparently, at least AFAIK) offered gas in the 36s.

There was a 40, too, but I can't remember engine options for those...

-Chris
I saw one 36 with twin Perkins 200. Also saw a couple of 40s with twin Perks.
But they are rare.
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Old 02-04-2016, 09:50 AM   #12
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We've got a 40 with twin perks. There are a few others with gas I've seen floating around. We "trawler"it up most of the time at 7 or 8 kts burning 3-4 gph.
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Old 02-04-2016, 05:28 PM   #13
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The 36 came with twin 4 cylinder perkins, the 4.236, I believe. The 40 came with twin 6.354. In later years, they used the 8.2 L Detroits.
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Old 02-04-2016, 07:02 PM   #14
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I cant believe they fit anything bigger than these perks in there! my radiator caps and turbo "horn" are literally pressing against the hatch when it's closed. are the 8.2s squat or what?!
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Old 02-05-2016, 06:13 AM   #15
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Originally Posted by slowandsteady View Post
The 36 came with twin 4 cylinder perkins, the 4.236, I believe. The 40 came with twin 6.354. In later years, they used the 8.2 L Detroits.
I have seen scores of 36 aft cabin Mainships. Never saw one with twin 4 cyl Perkins. Only the one with the twin 200s, or gas 350s.
Never saw a 40 aft cabin with Detroits. Only Perkins. Or gas 454s..
All of the 40 Pilot House models had the original 160hp version, then the later ones had the 165 hp or 200 hp Perkins.
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Old 02-11-2016, 06:48 PM   #16
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I won't argue with you jleonard because you have been around boats way longer than I and now you've placed some doubt in my mind. But when I first started looking at Mainships I lusted after one that I saw on YW that I am almost sure had twin 4 cylinder Perkins in it. The 36 on YW now has new DD 8.2, not factory. Would Mainship really put twin 200 Perkins in that hull? Wait, they put twin Crusaders in them, I think I just answered my question. Maybe you're right...
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Old 02-11-2016, 07:52 PM   #17
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We are Living aboard and cruising on one.

Quote:
Originally Posted by Luke-44 View Post
Interested if there are any more updates and new comments on this thread from current crusader 270 hp owners as I am considering the same boat and have the same questions. ,
Luke

I dont have the time or energy to answer all your questions tonight.
I am retired so call me tomorrow, any reasonable time (EST) and I can answer all of your questions. I am sending you a pm with my cell number.
If I dont hear from you, I will post the answers on here when I can.
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Old 02-14-2016, 08:27 AM   #18
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Slow & steady I am not counting repowered. The field is open there.
I know of some who used twin Yanmars for example.
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Old 02-14-2016, 09:22 AM   #19
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Fuel Economy

This is an older post but has been renewed.

After I bought the 1986 Mainship 36 DC, I joined a Mainship Group on Yahoo Groups.

On there I came on contact with an owner of an identical boat to mine. he had traveled the Great Loop for 6500 miles.
He kept meticulous records using Flow Scan meters for the entire trip.

He sent me the data attached.
It turned out to be very accurate for me, although I don't have flow scan meters. I checked my mileage and fuel consumption and come up with the same figures.
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Old 02-14-2016, 09:52 AM   #20
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One More Chart

Since I had planned a long trip, I did the following calculations based on the info on the preceding charts. This chart was designed specifically for me and on the current price of gas at the time.
We generally travel on one engine at a time at 7 SMPH. We knew that traveling from Houston, Tx area to Mississippi (our first goal) could be problematic in the way of few gas stops and marinas. This new chart would help determine if speeding up would be economically worth while or would we run out of gas.
This chart had been invaluable for decision making as we traveled approx. 2,000 miles so far. I will update it in the next month or so to reflect the new price of gas.
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