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Old 08-20-2018, 01:48 PM   #21
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Thanks to all for your comments. I started out convinced that I wanted a 30-35 foot trawler with a diesel, but it seems people who own boats in that category spend a lot of time on maintenance, and I'm an older guy; I don't have a lot of time. Or mechanical knowledge. So I started thinking that maybe I should be considering something on the order of a Rosborough or C-Dory. Now I don't know what to think.

There is no simple answer. It all depends on how you plan to use the boat but unless you are planning to do the loop, planning to be a live aboard cruiser, or some other extensive cruising, a gas outboard can check a lot of the boxes as most boaters put well under 100 hours a year on their boats.

So, how and where do you plan to use the boat?
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Old 08-20-2018, 02:18 PM   #22
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"This makes diesel the only option for a bigger boat."

For a big fast boat like a sport fish that requires big HP.

A displacement boat will cruise on about 3 HP per ton (2240lbs) .

So a 150,000 displacement cruiser ( a bigger boat) would be about 70 tons and require perhaps 200hp.

200 cont hp is easily available from most V8 or many outboards.

When the service is over 1000, 2000 hours a year diesel wins.
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Old 08-20-2018, 02:29 PM   #23
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...
I have read Europe is going to ban diesel engines, at least in and around cities since they pollute worse than gasoline.
...
Turns out that the 2.5 micron particles that diesels put out are very bad for you even if the other gaseous emissions are controlled.
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Old 08-20-2018, 02:50 PM   #24
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Plan to cruise the ICW, but not necessarily The Loop. Would like to go to New York and to Key West.
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Old 08-20-2018, 07:30 PM   #25
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Access to inboard (go faster) twin engines on a less than a 40-foot boat seems to be problematic. At least for less-flexible older fellows.
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Old 08-20-2018, 07:52 PM   #26
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"This makes diesel the only option for a bigger boat."

For a big fast boat like a sport fish that requires big HP.

A displacement boat will cruise on about 3 HP per ton (2240lbs) .

So a 150,000 displacement cruiser ( a bigger boat) would be about 70 tons and require perhaps 200hp.

200 cont hp is easily available from most V8 or many outboards.

When the service is over 1000, 2000 hours a year diesel wins.
Yep, and donot forget lower rpm torque.
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Old 08-20-2018, 07:53 PM   #27
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There are a few other considerations. Outboards swing smaller diameter props that tend to cavitate when really loaded up. Their small alternators make hard to charge up a larger battery bank. For us in the Northern areas... you need an alternate method of providing heat for both the cabin and water... My experience is for a day type boat OBs are fine, not so much for spending more than a couple days on the hook..
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Old 08-20-2018, 08:34 PM   #28
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Many (most) of the larger 35'+ style fishing boats (GW, Pursuit ,etc) around here that carry multiple large outboards also carry a stock diesel genset. These often troll for many hours in ocean sea states and some are very large in size and weight without reported troubles.
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Old 08-21-2018, 08:43 AM   #29
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Never Too Late:

Now that we have opined on most sides of your question, do you have two specific boats, one with a 200 hp O/B and one with a 200 hp diesel inboard that you are considering?

The closest I can think of is the Ranger Tug 23 that is offered with a 200 hp outboard or a 170 hp diesel I/O, although I doubt if they sell many of the latter. Or maybe the new Rosborough 246 with an outboard vs an older diesel powered one.

Also you say you would like to cruise to Key West and New York, presumably from your base in what, NC? That is roughly 1,500 miles round trip to NYC and close to 2,000 to Key West from Wilmington, NC. Those will be significant trips for a 23' Ranger Tug, doable but tough.

So maybe you are thinking about something bigger, but I can't figure out what. Could you enlighten us?

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Old 08-21-2018, 09:15 AM   #30
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Another factor that is likely more of a geographical consideration than otherwise is availability of gas vs diesel. Locally diesel is readily available, but there is only ONE place that sells gas. Why? Well we have a relatively large work boat fleet (lobster boats) that is universally inboard diesel. Gas can be very hard to find in this area unless you are willing to jerry can it to the boat, which many of the runabout owners do.
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Old 08-21-2018, 09:17 AM   #31
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Originally Posted by djmarchand View Post
Never Too Late:

Now that we have opined on most sides of your question, do you have two specific boats, one with a 200 hp O/B and one with a 200 hp diesel inboard that you are considering?

The closest I can think of is the Ranger Tug 23 that is offered with a 200 hp outboard or a 170 hp diesel I/O, although I doubt if they sell many of the latter.

Also you say you would like to cruise to Key West and New York, presumably from your base in what, NC? That is roughly 1,500 miles round trip to NYC and close to 2,000 to Key West from Wilmington, NC. Those will be significant trips for a 23' Ranger Tug, doable but tough.

So maybe you are thinking about something bigger, but I can't figure out what. Could you enlighten us?

David
Yup, the OP needs to state the boat and it's intended use. The 23' Ranger Tug is simple, put it on a boat trailer and tow it.

In the PNW many Ranger Tugs have a diesel inboard with a factory installed OB mounted for trolling or get home capability. The best of both worlds it would seem for cruisers.

The neatest rigs I've seen though are either an aluminum Sea Wolf or Kingfisher in the 32' range with a pair of 300 OBs and a trolling motor. The demand for these vessels is huge by the sport fishing crowd. Especially when traveling long distances. Many of the owners I've talked to would never go back to diesel given the utter simplicity of the big outboards and ability to tilt them out of the water when parked.
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Old 08-21-2018, 09:26 AM   #32
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There is an outboard powered 30' Rosborough Roughrider inflatable trawler listed on Craigslist that might interest you.

https://jacksonville.craigslist.org/...664358402.html
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Old 08-21-2018, 09:31 AM   #33
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Originally Posted by Never too late View Post
Thanks to all for your comments. I started out convinced that I wanted a 30-35 foot trawler with a diesel, but it seems people who own boats in that category spend a lot of time on maintenance, and I'm an older guy; I don't have a lot of time. Or mechanical knowledge. So I started thinking that maybe I should be considering something on the order of a Rosborough or C-Dory. Now I don't know what to think.
Some of the new outboards have a great reputation for low maintenance, better fuel economy and more power, but even compared to a 15 yr old diesel the diesel stacks up pretty good. Now a new diesel, I'd take anytime of a gas anything.

FWIW, my maintenance for 370 yanmar in my trawler operates for less than 25% of the cost of my Sundance with a pair of 4.3 Merc outboards, and they are pretty bullet proof little engines. The trawler takes WAY LESS time and while the parts are more expensive, they are still less as they are not changed as much. Just an observation.... and referring only to routine maintenance. As for major maintenance, have had none with the diesel and a handful of costly ones with the Mercs over the years.

For a trawler, I'd be hard pressed to be talked into outboards, unless perhaps they are diesel... but that's still a ways down the road.

However, one big advantage of the outboards is shallow draft, which can be a huge plus. As a counter point, I'd love to have a diesel IO to push my trawler. I know, a bit more maintenance, but a TON more flexibility and probably more efficient.
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Old 08-21-2018, 11:20 AM   #34
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The Cutwater C-302 Coupe is a 30' cruiser with twin O/Bs. It gets pretty much the same MPG whether it is going at 20MPH or 50.

C-302 Coupe
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Old 08-21-2018, 11:22 AM   #35
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Seevee wrote;
“For a trawler, I'd be hard pressed to be talked into outboards, unless perhaps they are diesel... but that's still a ways down the road.”

No problem as there’s no such thing as an OB trawler.
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Old 08-21-2018, 11:39 AM   #36
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David, two boats I am considering are the Camano 31 and the Rosborough 246.
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Old 08-21-2018, 02:13 PM   #37
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David, two boats I am considering are the Camano 31 and the Rosborough 246.

OK, those are two very different boats, but yes one has an outboard and one has an inboard diesel.

Irrespective of maintenance requirements, fuel efficiency, fuel safety, and cost, I believe that the Camano would be a much better choice for your mission.

I could live aboard a Camano for a 1,000 mile trip and enjoy it. I wouldn't enjoy doing 1,000 miles in a Rosborough.

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Old 08-21-2018, 02:55 PM   #38
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I'm with David on this one...
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Old 08-22-2018, 07:42 AM   #39
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The hardest problem with an I-O or an outboard for a larger boat would be in having a large enough prop , geared properly.

For a 30fter is would not be a big deal, but larger , there would be some efficiency losses .2 smaller engines might work.

My own objection to either is the inability to have the boats transom drop like on a pickup truck. Something I would build into a "next" boat.

I would enjoy sitting in a large covered cockpit a few inches above the water with the transom folded down .

The cockpit could also be shaped to hold a rubber dink , hard to steal, EZ to dock with , and perhaps a built in get home engine.
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Old 08-22-2018, 09:59 AM   #40
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The hardest problem with an I-O or an outboard for a larger boat would be in having a large enough prop , geared properly.

For a 30fter is would not be a big deal, but larger , there would be some efficiency losses .2 smaller engines might work.

My own objection to either is the inability to have the boats transom drop like on a pickup truck. Something I would build into a "next" boat.

I would enjoy sitting in a large covered cockpit a few inches above the water with the transom folded down .

The cockpit could also be shaped to hold a rubber dink , hard to steal, EZ to dock with , and perhaps a built in get home engine.
Perhaps related - I have towed a number of larger boats with RIBS that had outboards. As one example only we towed a 45' Cruisers for over 10 miles with a twin engine RIB and had no problem holding 6-7 knots with the existing props ...which were selected for speed and not towing.
I am sure the props could be changed to account for the intended use and be better matched for the task.
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