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Old 09-28-2019, 09:28 PM   #61
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Twins can also have shaft and prop. Protected as per photo of my Selene
A rare beast.
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Old 09-28-2019, 09:35 PM   #62
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A rare beast.
That’s the beauty of dealing with Selene yard, a complete FD semi customed boat at the price of a production boat...
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Old 09-28-2019, 09:38 PM   #63
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These double keeled twins probably aren’t as fuel efficient.

The difference on a single v/s twin w one keel is fly-stuff. Some twins are probably more efficient than singles.
Lots of variables to stack up.
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Old 09-28-2019, 10:38 PM   #64
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A rare beast.
Not really. KKs and Nordhavns can come this way too if one is so inclined.
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Old 09-28-2019, 10:42 PM   #65
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Singles with perfect designs can have strike issues too. A good friends Nordhavn 55 hit some ice near Petersburg AK this summer. Both main and get home drive trains damaged.
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Old 09-28-2019, 11:13 PM   #66
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That’s the beauty of dealing with Selene yard, a complete FD semi customed boat at the price of a production boat...
Are Selens full displacement?

I thought they were semi.
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Old 09-29-2019, 02:44 AM   #67
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Twins can also have shaft and prop. Protected as per photo of my Selene
Unreliable memory of the one or two past "twins vs single" chats is that Gulfstars have protected twin props. Never seen one for myself, probably never will.
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Old 09-29-2019, 05:51 AM   #68
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Singles with perfect designs can have strike issues too. A good friends Nordhavn 55 hit some ice near Petersburg AK this summer. Both main and get home drive trains damaged.
A friend of ours wrecked their prop and shaft on their keel/skeg protected single engine trawler on the ICW a few years ago (and, no, not on the Rock Pile, which is the first thing I asked when he told me about it). They still don't know what they hit.

I told him I would have bet that what happened to him was darn nigh impossible, before it happened.
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Old 09-29-2019, 07:43 AM   #69
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Twins can also have shaft and prop. Protected as per photo of my Selene
Also mine.
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Old 09-29-2019, 10:35 AM   #70
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Know your boat.
Unless there was a 'V' in a reef that I threaded the keel into the props are protected as the forward part of the keel would hit first. Sure run aground and have the tide drop. lean over prop shaft damage. Sure run over a water logged object and it may take out one of the shafts. A lot must all conspire against you. But please stop saying props are unprotected suggesting imminent damage awaiting.

Attachment 94547
Also have well protected twin props and rudders:
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Old 09-29-2019, 10:35 AM   #71
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syjos wrote;
“Are Selens full displacement?

I thought they were semi.”

The one in post #59 is not even close to FD. SD to be sure.
The GH in #69 is clearly FD.
The one above in #70 is also SD....
IMO

The Seaton above has a very interesting fore and aft support for the lower shoe. Never seen that before. Probably too much drag for much in the way of SD speeds. But w props that far inbd. she probably runs straighter than most running one engine.
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Old 09-29-2019, 11:08 AM   #72
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Here are my twins on a KK42. They only built 5 like this. A good 2’ to the bottom of the keel. You can see the blank in the center where a single shaft would exit Click image for larger version

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Old 09-29-2019, 11:17 AM   #73
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Go for the Gusto... Go With Twins!

16 to 17 knots [on full plain] = 1 nmpg

When we have desire to get there more than twice as quick... #3 works well.

I do really like the many speed levels as well as hard chine handling capabilities when on full-plain and hard chine stability while at anchor that exists with planing hull and twins.
Although I really agree with the advantages of a single engine trawler, Art's post above & the performance of a twin and what it can bring to the party are traits that I'm addicted to.
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Old 09-29-2019, 11:17 AM   #74
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syjos wrote;
“Are Selens full displacement?

I thought they were semi.”

The one in post #59 is not even close to FD. SD to be sure.
The GH in #69 is clearly FD.
The one above in #70 is also SD....
IMO

The Seaton above has a very interesting fore and aft support for the lower shoe. Never seen that before. Probably too much drag for much in the way of SD speeds. But w props that far inbd. she probably runs straighter than most running one engine.
My Selene 80 in post #59 is a full displacement hull, twin engines!!!
Almost all Selene, no matter the size are FD, may be you should go and visit the shipyard in Zuhai, China and check by yourself...
Please check your sources before posting such wrong and misleading informations
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Old 09-29-2019, 11:34 AM   #75
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The Selene 49 and 54 with near 47' WLL advertises an 11.5 knot top speed and a 9 knot cruise.

Of course when you put small enough engines in any boat they're all pretty much displacement. .. But that doesn't mean their hull shape is.
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Old 09-29-2019, 11:37 AM   #76
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CaptianSEA,
You’re welcome to your opinion.

Meridian, nice setup.
Most floating debris works it’s way outboard as the boat moves fwd so a centered propeller has the advantage. But your setup may be as good or better hitting things not floating.
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Old 09-29-2019, 11:45 AM   #77
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CaptianSEA,
You’re welcome to your opinion.

Meridian, nice setup.
Opinions are different from facts!!! Don’t know where you got your sources from but please check again, as far as I am concerned as well as hundred of Selene owners, we know pretty well the technical specs of our boats.
Have a good day.
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Old 09-29-2019, 11:56 AM   #78
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The Selene 49 and 54 with near 47' WLL advertises an 11.5 knot top speed and a 9 knot cruise.

Of course when you put small enough engines in any boat they're all pretty much displacement. .. But that doesn't mean their hull shape is.
Understood, but at 2 meters draft, 2 x 450 hp for a speed of max 12.5 kts and bulbous bow, a 2500 nm range and an FD hull design I would not classify my boat as an SD as stated earlier or would you also consider a Nordhavn 64 or 76 as an SD boat???
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Old 09-29-2019, 12:30 PM   #79
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Captian SEA,
Speeds or speeds attainable is not an identifying element of FD/SD definition.
It’s all about hullform. If you don’t at least have some QBBL angle aft the hull is either planing or SD. Not ever FD.
I don’t follow Nordhavns. Show me a pic of their stern below the WL and I’ll comment. In a new thread. This is not on topic.
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Old 09-29-2019, 01:08 PM   #80
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Understood, but at 2 meters draft, 2 x 450 hp for a speed of max 12.5 kts and bulbous bow, a 2500 nm range and an FD hull design I would not classify my boat as an SD as stated earlier or would you also consider a Nordhavn 64 or 76 as an SD boat???
I just stated manufacturer specs, whether they are facts or not.

I also didn't comment on all Selenes....just those 2

Despite your physical description of your boat...do you consider boats that can go 1.7 times the square root of the WLL full or semi displacement?
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