1988 Mainship Nantucket

B

Bill Taylor

Member
Joined
Mar 30, 2001
RO Number
3998
Messages
64
Greetings: Have found a fresh water 1988 with cursader small blocks. Boat on first viewing looks quite accetable. However given wt at 20000 will the small block push her at a speed of 12kts with some reserve. As well given the history of fibreglass is she constucted well and meets the ABYC standards of the day. Any other information welcome. Regards Bill Taylor
 
Well the moderator of this forum is a surveyor and he has a 36DC. I have a 1993 Sedan Bridge and the hull is solifd thick fiberglass. My topsides were showing signs of crazing and some minor cracks it was repaired and new gelcoat applied 4 years ago. She looks like a boat made in the 2000's not a vintage boat. I have been on many 36DC's and haven't seen one with serious fiberglass issues. As far as speed I can't answer that my hull is a planing hull with fresh 8.1L HO Mercs it will do 30 to 31knots WOT. I rarely run it that fast my usual cruising speed for me is 21 to 23 knots.
Bill
 
I wouldn't mind owning a 36DC but I would only get out of my current Mainship if I could find one with Diesels, very rare for the 36DC.
Bill
 
Bill, I have a '87. When I cruise I run 2900 rpm and the speed is 14.5 - 15.0 mph. On good water that translates to 13gph or .9 mpg. Push it hard and it will go 25pmh. I have been experimenting at running at a little over 8 mph this year but I haven't filled yet to see the numbers. Fire away with the questions, we are in our 5th season with the boat and we really like it and I have layed my hands on most of it :)
Niles
 
I've got a buddy who has that boat with the small blocks in it. I've been on it a number of times and never felt it to be underpowered.
I've always liked that boat a lot. Good interior space, decent speed, handles well and takes a chop without beating you to death. My only complaint is the fly bridge is kinda tight on space.
 
NWaning and All: Great answers. Boat has wonderful glass,but needs some interior upgrading, cosmetic dressing interior. Has a hard top over the aft cabin. Being on the Great Lakes and having heavy mileage to get from habour to cruise areas, stealing along at bearly 8 kts is an issue given that all the movement is over open water. I thing that pushing the small blocks, one orginal, at RPM greater than 2000 really puts a load on them. As well the fuel curve will rise to around 15 to 20 gals per side in my view and would result in running range of about 6 hours or about 60 mile range. My closes fuel when I leave is around 50 NM. The current owner does not have stats as he runs on the Trent Severn Canal which has fuel every few miles so range is not an issue. But nevertheless my fears are that the small blocks really are working hard pushing 20000 or more pounds through the water. You could lessen the load by not carrying full water at the stern, but what is the gain.
If your use shows different stats I would be please to hear. Interesting discussion. Bill
 
There's 2 ways to run that boat. If you want economy, run hull speed - about 7 knots. If you want speed, then get up on a decent plane, I'm guessing around 15 knots. Anything inbetween those 2 speeds and you are wasting fuel.
I don't understand what you mean by anything over 2000 RPMs really puts a load on the engines. Those engines were designed to run 3000 all day long. Again, most boats that size need big blocks, but somehow Mainship designed it to run well with small blocks.
 
These boats are semi-displacement; the power requirements are different when compared to planning hulls. Running the engines at 3k or little above is not putting a load on them, their meant to run there, just below the 4-barrels coming in.

Looking at my 2010 log I ran from Erie Pa to Port Colbourne (61 miles), thru the Welland (26 miles) to Toronto (28 miles) back to Wilson, NY (35 miles) for a total of 150 miles. All but the Welland was cruising speed. I fueled in Wilson and took on 177 gallons leaving 63 still in the tanks. That run totaled 20.1 hrs (11 Welland) and my GPH was 8.86. I have done many 100 -120 miles runs and burned roughly ½ a load.

UPDATE: 3 weeks ago we crossed from Erie to Port Dover, ON. and back for a total of 108 miles and the refuel was 125 gallons. hrs was 9.4 gph was 13.3 and the mpg was .87 Almost all of it was 3000rpm cruise at 15+ mph.

Good luck
Niles
 
I have a 1985 Double Cabin with late model Marine Power 454 EFIs. She runs well at 3000 rpms with a gph of about 14. I don't believe you'll find a better aft cabin for the market value of these boats. They are very well constructed and the semi-displacement hull is just wonderful.

You will have two advantages with the 350s. There lighter and will be easier to work on in the engine room.
 
I'm curious if the Nantucket is a slightly different boat then the 36 Double Cabin. It's more like a Pilothouse boat there were very few made most were diesels and it is about 40'?
I think they were only made for 2 or 3 years off to the Mainship website if it's still up if so I will post a link.
Bill
 
I don't know but I think they are the same. The last year of the 36dc was 1988. I have the seen many 36DC refered to as Nantucket's. If I go to the boat I will look at my orginial owners manual and see if Nantucket is referenced.

Al...were your engines replacements. I didn't think big blocks were even an option on the 36dc. Diesels were but very rare.

Niles
 
My favorite Mainship the limited production 40 Motor Cruiser with a pair of Perkins.
I wish I could find one with diesels but would need to sell of my favorite Mainship 40 Sedan Bridge.
Notice the number built "20". Very unique boat one was for sale in the Mass. area and Northeast Canada but I can't be a 3 boat owner. In fact I feel very fortunate that I was able to modernize the Mainship 40SB I have.
http://www.mainship.com/models/previous_models/40mc.htm
 
I dug up the original flyer for my DC and it says Mainship Nantucket 36DC. I have only ever seen two 40DC's and there is a quite a bit of difference to the 36DC.

While walking the docks at the Erie Yacht Club last month I came across a Mainship 37 Motor yacht. I had never seen this model before and I would have loved to have checked it out but nobody was around.

Niles
 
I think the 37 is a CPMY. It's also a unique boat. Naibship did well with all but the express cruisers. The express was a real dog.
The most popular older model is the 34 Mark I, II & III trawlers. These were built and sold during the last big econmic decline and when we had the initial gas crisis.
Bill
 
We are on our fourth summer with our 36. Running at 3000rpm gives us 15 knots, on sea trial WOT gave 4250 at 24.8 knots. At 3000 use about 18 gph. Last week had the boat in southern Lake Huron in 3-4 footers, not a problem at all.
Very solid hull. When we bought ours it had a pink couch and drapes, my wife redid the whole interior and it looks great. We have more room than a friends 40' Sea Ray.
 
quote:
Originally posted by yamadon7

We are on our fourth summer with our 36. Running at 3000rpm gives us 15 knots, on sea trial WOT gave 4250 at 24.8 knots. At 3000 use about 18 gph. Last week had the boat in southern Lake Huron in 3-4 footers, not a problem at all.
Very solid hull. When we bought ours it had a pink couch and drapes, my wife redid the whole interior and it looks great. We have more room than a friends 40' Sea Ray.

Click to expand...


Like I said earlier, roomy, takes a chop and will run all day at 3000. It's a nice, well thought out boat. I'd much rather have one than a lot of the newer ones coming out of boat yards.
 
Don, good to here from you. We went east this year for our big trip so we will be coming west next year, I'll give you a shout out if we make it up your way. I plan on refueling this weekend so I'll have some numbers on our 50 miles at 8 mph and how much fuel we usedsaved.

Niles
 
36DC in trawler mode, speed was right around 8+ mph and the rpm's was 1600 - 1700

52 miles...gph 3.5...MPG 2.3...gallons used 23...time 6.5 hrs.

Niles
 
Niles, My boat was repowered with the late model big blocks before I bought it six years ago. My boat is a Nantucket with the lower driving station as well.
 
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