Newbie from NY.

Manowar

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Hey guys I'm Andrew, newbie from New York. I'm a Marine Diesel tech by trade. Former USCG mechanic. Now I work directly for the Cummins Factory. Certified 75-2600 HP. I'd be glad to help answer any general diesel questions or cummins specific questions. They're all the same animal.
I joined this forum to learn more about the Downeast and its mechanical limitations (if there are any). In the near future I plan on purchasing a Downeast 35-40 feet, hard chine or built down, with a blown, warn out or missing engine. Im in a position with my job where I can build a 670 qsm 11 or a 600 HO QSC for very cheap. I would need to lay in an engine bed, fit up the right gear, prop ect,, maybe fit up some large raw water and fuel plumbing intakes ect. Fun winter project for me. My goal would be to have a 45kt WOT and a 35kt cruise. The over kill of the QSM 670 or QSC 600 should achieve those speeds. The other half of the project would be to completely paint rewire and over haul the boat. I'm building an offshore fishing machine. Full enclosure, AC, genset, out riggers, live wells, electronics, fish holds. I hope to consult with the pros on this forum throughout the project and provide some diesel knowledge in return.
 

petrel

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I hear you hot rod. Maybe need a few more ponies for that kind of speed in a keel boat that size. 45 KNOTS is pretty strong.
 

Manowar

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45 Kts

More like 42 wot and 32 cruise? Or am I still dreaming? The QSC 600 has a much better power to weight ratio then that big 670 QSM.
 

petrel

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I think yer dreamin', but I'm trying to figure out what it takes to go that fast...
 

petrel

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For starters, it's gonna take a particular hull.
 

Manowar

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Hard chine for sure. Look into that QSC "HO". Impressive fuel burn as well. Common rail of corse. But for a hull I'm thinking like a 37 BHS or Duffy. 80's... Another 2 or 3 feet I might loose that over 40 kt goal.
 

petrel

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See the Searsport thread to see what it takes to go 40 knots in a 36 Northern Bay. More than 600 hp c series, it would seem.
 

Manowar

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Trying to get to the canyon cruising in the 30's.. That northern bay looks like the hull... Damn that's nice. Now I just need to find one sitting in the back of a boat yard with a blown engine. Ha.
 

Blitzen

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It's not going to happen. You need water line length to make for a smooth ride in the ocean which in turn equates to wetted surface area or drag, which equals HP. Better be looking at a better Length to beam ratio than a DE.
 

CEShawn

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I only like to go fast enough as to not mess up my Spagettio's in the microwave... After that its just to messy. Hit one wall or one hole at 40kts, no thank you. Some of those holes at 18kts are sometimes to much.

Make sure you have really good windows too...
 

Frigate

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You can get a DE to do 40 knots (68 feet per second) if you remember your high school physics. Achieving 40 knots would only take a few seconds after the following....

flat-earth.jpg
 

Blitzen

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Good info blitzen. What does your 36 cruise and top out at?

With the 575 it cruises easily at 18-23kts and tops out at 27kts. 20-22kts seems to be the sweet spot most of the time but when we get into the short steep chop 16-18kts is the ticket.
 

Frank Grimes

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Manowar--

First Team put together a 38' NB a few years back all decked out with the offshore goodies, QSM 11 670, that went what, about 30kts in the corner? Solid 26kt cruise, was it?

I support your quest to make a DE go like a modern sportfisher with a single diesel, but unless you get into the mid 40's and start talking about 12 cylinder MAN engines, it ain't gonna happen. Not to mention the fact that once the weather kicks up a little bit you're gonna need to slow waaay down in the DE....the beauty of the hull form is that she can still go 20 in all but the sloppiest of slop, whereas a comparable deep or modified V would be wallowing all over the ocean and you're either doing 28kts getting your face kicked in or displacing at 8kts.
 

Muscie

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36 Flowers finished by Cape Island, 2014 ; 645 QSM11
You might also want to consider the considerable uptick in fuel consumption. For fishing & cruising in these boats 18-20 knts is the most comfortable. In lousy conditions you can almost go through anything you are willing to be out in at 16knts.
 

geosushi

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Should be able to let you know around april or may a friend is building a 38nb now 38 morgan with a QSM11 715hp
 
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