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Old 02-20-2012, 03:47 PM   #1
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Mainship Trawler 34

I currently have a 30 Mainship Pilot with a single 315hp Yanmar.* The boat cruises at 14mph-15mph and will top out at 21mph.* I love the boat but need more room in the engine room.

I am considering a 34 Mainship Trawler but I am getting conflicting reports as to the speed with the single 375hp Yanmar.

Any thoughts?


-- Edited by T2056 on Monday 20th of February 2012 05:46:45 PM
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Old 02-20-2012, 05:11 PM   #2
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RE: Mainship Trawler 34

If you read the 390 discussion right under yours, you can read JD's comments. He can reach 16kts at 3200 rpms. Your pilot was designed to plane the trawlers really aren't.
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Old 02-21-2012, 09:56 AM   #3
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Mainship Trawler 34

Quote:
T2056 wrote:
I currently have a 30 Mainship Pilot with a single 315hp Yanmar.* The boat cruises at 14mph-15mph and will top out at 21mph.* I love the boat but need more room in the engine room.

I am considering a 34 Mainship Trawler but I am getting conflicting reports as to the speed with the single 375hp Yanmar.

Any thoughts?

-- Edited by T2056 on Monday 20th of February 2012 05:46:45 PM
Well here is how you get conflicting reports.* When one says a Mainship 34 one is covering boats from the 80's through 2009.* As an example ask for the top end on a White Corvette.* Several folks with White Corvettes will answer but a 54 six and a 2009 will have a great disparity. I would guess you boat weighs in at about 14,000 lbs where as the 34t's are at a bit above 20,000 lbs.* We carry about 300 gallons of fuel and water at any one time which is another 1,800 lbs give or take.*

Even on the Mainship Owners List the problem exists.* Someone with a 2006 34t will ask a question and someone will answer, and is just trying to be helpful, but they have a Pilot or a 92 or some other year*34 Mainship.* The two boats are no where near alike.

So here is what a Mainship 2006 34t with a Yanmar 6LYA*370 HP*single screw four blade prop and clean bottom*will do.* At about 1,800 rpm and without a head wind of more than 5 to 8 kts the speed over ground will be about 7 kts at about 2,000 rpm we make about 8 kts.* Now at full throttle*which is 3,400 rpm*and full trim tabs*we get 16 or 16.2 kts.

The problem is that the 34t was built with three different engines. There is no 375 hp engine.* Some brokers make stuff up, now notice I said some, not all.* In some cases the selling owner doesn't know and the broker uses what they are told which is misinformation.* The early boats 2004 and 2005*may have the stock engine which is a Yanmar 315 hp or they may have a Cummins which was a $20k up grade.* The late 2005 through the final production boats came standard with the Yanmar 6LYA which is 370 hp.* The Cummins was an option as well.* Now to confuse you*even more all year models 04-09*were available with twin Yanmars.* But the majority are single 6LY or 6LYS's.

If you do not believe the speeds I am telling you I can supply the page on my surveys sea trial that makes that statement.* I was there on the fly bridge when it was observed by the surveyor.

*

Hope this helps.* Feel free to ask anything about the boat that*I may be able to answer.* I'm familiar with most*all of the systems on a 2006 34t.*


-- Edited by JD on Tuesday 21st of February 2012 10:59:54 AM
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Old 02-21-2012, 10:31 AM   #4
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RE: Mainship Trawler 34

Thnak you, sir.
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Old 02-21-2012, 10:31 AM   #5
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RE: Mainship Trawler 34

Thank you, sir.
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Old 04-23-2012, 07:29 PM   #6
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pilot 34 with yanmar 370 hp

My pilot express 34 hit 23 knots with the 375 hp engine
tocade
Quote:
Originally Posted by T2056 View Post
I currently have a 30 Mainship Pilot with a single 315hp Yanmar.* The boat cruises at 14mph-15mph and will top out at 21mph.* I love the boat but need more room in the engine room.

I am considering a 34 Mainship Trawler but I am getting conflicting reports as to the speed with the single 375hp Yanmar.

Any thoughts?

-- Edited by T2056 on Monday 20th of February 2012 05:46:45 PM
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