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
