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02-01-2012, 03:58 PM
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#1
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Guru
City: Joe Wheeler State Park, Al
Vessel Name: Serenity
Vessel Model: Mainship 36 Dual Cabin -1986
Join Date: Jul 2011
Posts: 1,251
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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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02-02-2012, 10:12 AM
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#2
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Guru
Join Date: Apr 2009
Posts: 1,920
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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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02-02-2012, 02:48 PM
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#3
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Member
City: Chico
Vessel Name: Terrapin
Vessel Model: 36 Mainship DC
Join Date: Feb 2012
Posts: 12
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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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02-02-2012, 02:53 PM
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#4
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Guru
City: Whittier AK
Vessel Name: Apache II
Vessel Model: 1974 Donald Jones
Join Date: Oct 2007
Posts: 3,147
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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?
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*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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02-02-2012, 02:53 PM
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#5
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Moderator Emeritus
City: Home Port: Buck's Harbor, Maine
Vessel Name: "Emily Anne"
Vessel Model: 2001 Island Gypsy 32 Europa (Hull #146)
Join Date: Sep 2008
Posts: 2,846
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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.
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*Wow! Motorcycle engine?
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02-02-2012, 03:56 PM
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#6
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TF Site Team/Forum Founder
City: League City, Tx
Vessel Name: Floatsome & Jetsome
Vessel Model: Meridian 411
Join Date: Oct 2007
Posts: 7,332
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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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02-02-2012, 04:10 PM
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#7
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Member
City: Chico
Vessel Name: Terrapin
Vessel Model: 36 Mainship DC
Join Date: Feb 2012
Posts: 12
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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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02-03-2012, 08:20 AM
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#8
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Senior Member
Join Date: Jan 2011
Posts: 239
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RE: Mainship 36
20,000 rpm - more like Formula 1... probably would burn about 20gpm :-D
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02-03-2016, 10:20 PM
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#9
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Veteran Member
City: Sewell
Join Date: Oct 2015
Posts: 26
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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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02-04-2016, 06:59 AM
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#10
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Guru
City: Annapolis
Vessel Name: Ranger
Vessel Model: 58' Sedan Bridge
Join Date: Aug 2013
Posts: 7,088
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Quote:
Originally Posted by timjet
Not considering a diesel?
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Quote:
Originally Posted by Baker
And FYI...it is a planing hull....or at least a semi-planing hull. I would recommend diesel!!!
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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
__________________
Chesapeake Bay, USA
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02-04-2016, 09:06 AM
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#11
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Guru
Join Date: Jun 2008
Posts: 5,037
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Quote:
Originally Posted by ranger42c
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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I saw one 36 with twin Perkins 200. Also saw a couple of 40s with twin Perks.
But they are rare.
__________________
Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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02-04-2016, 09:50 AM
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#12
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Guru
City: Tavernier, FL
Vessel Name: Volans
Vessel Model: 2001 PDQ MV 32
Join Date: Jan 2015
Posts: 580
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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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02-04-2016, 05:28 PM
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#13
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Senior Member
City: North Kingstown, RI
Vessel Model: Mainship 34 III
Join Date: Jul 2013
Posts: 179
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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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02-04-2016, 07:02 PM
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#14
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Guru
City: Tavernier, FL
Vessel Name: Volans
Vessel Model: 2001 PDQ MV 32
Join Date: Jan 2015
Posts: 580
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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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02-05-2016, 06:13 AM
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#15
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Guru
Join Date: Jun 2008
Posts: 5,037
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Quote:
Originally Posted by slowandsteady
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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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.
__________________
Jay Leonard
Ex boats: 1983 40 Albin trunk cabin, 1978 Mainship 34 Model 1
New Port Richey, Fl
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02-11-2016, 06:48 PM
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#16
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Senior Member
City: North Kingstown, RI
Vessel Model: Mainship 34 III
Join Date: Jul 2013
Posts: 179
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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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02-11-2016, 07:52 PM
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#17
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Guru
City: Joe Wheeler State Park, Al
Vessel Name: Serenity
Vessel Model: Mainship 36 Dual Cabin -1986
Join Date: Jul 2011
Posts: 1,251
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We are Living aboard and cruising on one.
Quote:
Originally Posted by Luke-44
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. ,
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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.
__________________
Cruising the Eastern U.S. Inland Waterways and Gulf Coast. Presently on the ICW in Louisiana and heading Back to Texas.
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02-14-2016, 08:27 AM
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#18
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Guru
Join Date: Jun 2008
Posts: 5,037
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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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02-14-2016, 09:22 AM
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#19
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Guru
City: Joe Wheeler State Park, Al
Vessel Name: Serenity
Vessel Model: Mainship 36 Dual Cabin -1986
Join Date: Jul 2011
Posts: 1,251
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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.
__________________
Cruising the Eastern U.S. Inland Waterways and Gulf Coast. Presently on the ICW in Louisiana and heading Back to Texas.
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02-14-2016, 09:52 AM
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#20
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Guru
City: Joe Wheeler State Park, Al
Vessel Name: Serenity
Vessel Model: Mainship 36 Dual Cabin -1986
Join Date: Jul 2011
Posts: 1,251
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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.
__________________
Cruising the Eastern U.S. Inland Waterways and Gulf Coast. Presently on the ICW in Louisiana and heading Back to Texas.
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