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29 to 43 footers with single instead of twins

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29 to 43 footers with single instead of twins

Old 01-12-2013, 03:42 PM
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Default 29 to 43 footers with single instead of twins

I have always wondered why sportfishermens, convertibless and express fishermens in these lenghts even in the 60's have been mounted with twin engines instead of a single diesel. Another reason is that I have seen a plug mold of a 36 footer for sale for 12K on yachtworld and boats.com and no-one has ever bought it.
My question is, why is this ?
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Old 01-12-2013, 03:45 PM
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Reliability and speed
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Old 01-12-2013, 03:48 PM
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A few reasons come to mind. Redundancy, less draft with 2 props of smaller diameter than one big prop and better handling in tight quarters. Would you rather be going out a rough inlet with twin diesels or a single? Twins for me please!
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Old 01-12-2013, 03:58 PM
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To get the HP you need for a 36 foot inboard, you are better off with twin diesels--in trawler types, the single may make some more sense--but most folks go for twins, unless going with an ocean crossing long range boat, and slow speeds.

Not sure about your question about the plug mold--it is a long way form there to a finished boat! Does this include all of the deck molds the hatches, interior--or just a hull which has to then be built out. Cost of the hull alone is only a small fraction of the cost of a boat.

I once looked at a boat which had twin 350 hp diesels--and the owner put in a single 600 hp--the boat handled very poorly. Design will be different in a high speed hull with a single and twins--rudder needs are different etc.
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Old 01-12-2013, 06:04 PM
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Originally Posted by thataway View Post
To get the HP you need for a 36 foot inboard, you are better off with twin diesels--in trawler types, the single may make some more sense--but most folks go for twins, unless going with an ocean crossing long range boat, and slow speeds.

Not sure about your question about the plug mold--it is a long way form there to a finished boat! Does this include all of the deck molds the hatches, interior--or just a hull which has to then be built out. Cost of the hull alone is only a small fraction of the cost of a boat.

I once looked at a boat which had twin 350 hp diesels--and the owner put in a single 600 hp--the boat handled very poorly. Design will be different in a high speed hull with a single and twins--rudder needs are different etc.
The 12K is for the hull only and now I see why it's still up for sale.
If it were used for downeast boats it would make a pretty nice hull.
It's a custom Carolina hull.
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Old 01-12-2013, 09:02 PM
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There were some. For example, you could get a 36' or a 42' Grand Banks with a single. But those models were much less desirable then and now for the following reasons (listed above):

Slightly better cruising speed,
MANEUVERABILITY,
redundancy.

Personally, I would never buy a 36-42' trawler with a single. It's under-equipped. Lots of 34s are singles, CHB, Mainships, etc.
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Old 01-12-2013, 11:26 PM
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speed and maneuverability. Twins backdown and spin aggressively on a fish (talking game boats not trawlers). Singles are not good for that so much though i have fished a awesome 33 with a single and thruster and that thruster got a work out and moved us around well.

Reliability not an issue. Commercial boats been going to sea on one engine for a hell of a long time and will continue to do so.
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Old 01-13-2013, 02:46 AM
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It's personal preference. I would go a long way offshore on this vessel. It has a 20+kt cruise speed and a single 800hp cat.

http://www.wesmac.com/tulsatime.html
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Old 01-13-2013, 05:23 AM
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100 miles out, if one fails, the other will get you home.
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Old 01-13-2013, 08:02 AM
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And why is it that so many commercial fishing boat have big singles? What is every NE Lobster boat? What is every Chesapeake Bay work boat? What is every boat out tuna fishing way off New England?

Give me a single big detuned commercial grade diesel anyday over a pair of high output, high turning, throwaway recreational motors.

A single engined hull with a protected prop will run over trap lines & slide over rocks undamaged. Can't do that with props & rudders hanging down.

So the single sacrifces some speed. Big deal!

Yeah man!! Now this is a real boat. http://www.wesmac.com/tulsatime.html
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Old 01-13-2013, 08:32 AM
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Originally Posted by Doug in Bermuda View Post
And why is it that so many commercial fishing boat have big singles? What is every NE Lobster boat? What is every Chesapeake Bay work boat? What is every boat out tuna fishing way off New England?

http://www.wesmac.com/tulsatime.html
As a rec fisherman if your traveling 100 to 150 miles to get to the canyons your fishing 16 knots sucks. These slow single engine displacement hulls spend days to a week or more on the fishing grounds.

A friend of a friend who I have met has a nice Duffy, 32 I believe. 16 to 18 knots and 5 to 6 hours to get to Oceanographer. 3.5 for me allowing me to fish more. Even then I hate the long ride. He can go faster (20 knot range) but his efficiency suffers considerably.

He does get about 50% better economy and is a charter. It is all a trade off but distance fishing you need speed unless you are retired.
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Old 01-13-2013, 08:51 AM
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Not all 50+ boats powered by single engines are slow. There are more charter boats fishing out of North Carolina inlets with single power than you know.
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Old 01-13-2013, 09:09 AM
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40+ miles out, spun an impeller, engine done (stuff happens).

Came back on the other. Twins for me please.
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Old 01-13-2013, 09:22 AM
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I have seen a G&S charter boat in the mid 50 range with a single 12V-92 up in Destin. It also carried about a ton of ice. With that said, i wouldn't wnat to try to back down on a billfish or tuna in a big boat with a single screw, bow thruster or not.
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Old 01-14-2013, 11:39 PM
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Originally Posted by cape_fisherman View Post
Not all 50+ boats powered by single engines are slow. There are more charter boats fishing out of North Carolina inlets with single power than you know.

True. I fished on a charter out of Hatteras several yrs ago. The sportfisher was very close to 50'. I went below to hit the head and peeked into the engine room. I was very surprised to see just one engine in there. It was as big as a beetle bug.
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Old 01-15-2013, 06:31 AM
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All you must have twin engine lot how does this grab you? Not quite finished but has been in the water & run. Tops out at near 35kts. Cruises in the high 20s. Powered by a 800hp Cat. Twin rudders. No thruster. hull is 46' Markley.

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A very nicely finished version of the same hull.

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Old 01-15-2013, 07:07 AM
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I think the 29' Sea Vee cuddy cabin single is a good choice. I have never had an issue getting a diesel running on a well maintained boat. Carry spare impellars, belts, filters (of course) and proper tools and you can usually get a diesel running. I would love a single diesel flybridge 32' or something like the Eastport.http://eastportyacht.com
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Old 01-15-2013, 07:13 AM
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Many sport fisher guys are afraid they are going to die if they venture away from the dock without a minimum of two engines.
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Old 01-15-2013, 07:21 AM
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Originally Posted by Doug in Bermuda View Post
All you must have twin engine lot how does this grab you? Not quite finished but has been in the water & run. Tops out at near 35kts. Cruises in the high 20s. Powered by a 800hp Cat. Twin rudders. No thruster. hull is 46' Markley.



A very nicely finished version of the same hull.

that boat is gorgeous!!!

Most of the "old salts" I know laugh at all these twin engine boats. I dont know a single one of them that would take a twin engine boat if it was given to them. These guys LOVE to talk about running their old 35+ footers on 100-150 HP Perkins diesels burning a few gallons an hour. I'm talking about guys who made 3, 400, 600 mile crossings with no stops.
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Old 01-15-2013, 07:25 AM
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The largest marlin ever weighed in NC was caught on a boat with a single. They won the NC gov. cup at least once as well. just to disprove the "backing down" issue.
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