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SWATH ships

 
 
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Old 08-20-2005, 11:09 PM   #1 (permalink)
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SWATH ships

Just watched a Science Channel program on this multihull design. It featured all kinds of vessels from science research ships and huge charter ships to military vessels. Can someone post a link to a website for it?
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Old 08-21-2005, 02:47 AM   #2 (permalink)
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Abeking & Rasmussen in Bremen, Germany, is building Swath ships. They have some information on their website, unfortunately a Flash-site so you have to find it yourself under the headline Ships and also under Yachts where I found the illustration below; http://www.abeking.com/flash.html

Look at the movie where they compare Swath to a monohull, unbelievable! Who will be the first to build a big Swath-yacht?
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Old 08-21-2005, 04:18 AM   #3 (permalink)
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Wow, those videos certainly speak for themselves! The first monohull almost disappears under all the water, whilst the SWATH sits ontop the wave and rides it no problem! Surely there is a market for this technology in yachts as well as working vessels?
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Old 08-21-2005, 11:02 AM   #4 (permalink)
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Any chance of some photos of the engine room on one of the Swath pilot ships?
What is the draught?
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Old 08-21-2005, 01:50 PM   #5 (permalink)
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The revenge of the humble pontoon!
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Old 08-21-2005, 01:55 PM   #6 (permalink)
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Thanks for the link Lars. The Science channel program also featured vids and the seas were 18-20ft. They showed a glass of water on the SWATH ship and it never spilled a drop!!
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Old 08-21-2005, 01:56 PM   #7 (permalink)
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Quote:
Originally Posted by KCook
The revenge of the humble pontoon!
LOL
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Old 08-21-2005, 09:45 PM   #8 (permalink)
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Very interseting, thanks.

Just one question, in the first video, the naval vessal appears to be much larger, could his apparently poor performance have something to do with his extra length and the distance between waves?

Perhaps the Swath vessal is aided by the fact that he is small enough to drive up and then down each wave?

Of course, I could be wrong.
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Old 08-21-2005, 11:09 PM   #9 (permalink)
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Quote:
Originally Posted by Ben
Very interseting, thanks.

Just one question, in the first video, the naval vessal appears to be much larger, could his apparently poor performance have something to do with his extra length and the distance between waves?

Perhaps the Swath vessal is aided by the fact that he is small enough to drive up and then down each wave?

Of course, I could be wrong.
Did you see any pitching motions from the SWATH vessel? I didn't. And it was obvious the SWATH was keeping its speed down to stay with the other ship.
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Old 08-22-2005, 03:05 AM   #10 (permalink)
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Anyway, the difference in pitching was great and it must also influence the fuel economy. As I understand it, the downsides of SWATH is more draught, I have seen figures representing more than 3 m on a 30 m boat, also it is pretty load sensitive which might be controlled with ballast tanks and finally, like all multihulls it will take more space in harbours.

Besides this, it must be the ultimate hull for comfort at speeds 20-30 knots. I think the first yachts to use it will be explorer types where the stability for handling tenders, submarines and helis is a big advantage.
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Old 08-22-2005, 05:48 AM   #11 (permalink)
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I'll try a different angle.

That Swath did look remarkably stable, so they must be onto a good thing.

I'm a bit of a learner in open ocean things, but those waves seemed to be just the wrong size for the ship. It didn't apear to be handling that swell very well.
Is that normal?

The smaller vessel in the second video (not the Swath) was heading into bigger waves and appeared to be staying out of the water better.


As I said, I'm a learner, so I'm just asking a question.
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Old 08-22-2005, 07:02 AM   #12 (permalink)
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Quote:
Originally Posted by Ben
Just one question, in the first video, the naval vessal appears to be much larger, could his apparently poor performance have something to do with his extra length and the distance between waves?

Perhaps the Swath vessal is aided by the fact that he is small enough to drive up and then down each wave? Of course, I could be wrong.
Ben is correct. The length differential of the vessels along with the frequency of swells contributed to the contrast in stability between these two hulls. Had the swells been smaller, with reduced frequency, longitudinal stability would have favored the monohull.
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Old 09-01-2005, 05:07 PM   #13 (permalink)
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I found a site (not very updated but anyway) where they have a lot on SWATH ships, the first patent was awarded a monohull SWATH! (Could be a Swedish invention?)

They are also trying to develop a tri-hull SWATH which would make sense I think. I like when boats behave like boats and the chances are that this boat will have nice motions at sea?

http://www.swath.com/Tri-hull1.htm
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Old 09-08-2005, 09:01 AM   #14 (permalink)
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Slightly off topic post...

After watching the SWATH video I was wondering about Princess Marina's beak hull, I was thinking that perhaps the idea is to provide a narower, sharper entry point to improve ride in smaller waves and chop (and economy/speed), but then flair out the hull to give enough boyancy so you don't cut to deep into bigger waves like the naval vessel did.

Sort of like a half way between ECO's narrow, cutting bow and Octopus's more conventional (looking) roomier bow.
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Old 09-08-2005, 09:42 AM   #15 (permalink)
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If there is any significant effect it is probably to the contrary. The high "chineline" is more of a design gimmick that Espen came up with almost ten years ago on a fast yacht concept which I believe was never produced. Then we have seen it on Skat, where I think it works very well and on Princess Mariana where I think the combination with the sloping nose looks a little strange...

Here she is in Monaco; http://community.webshots.com/photo/...45151065uOPkbO

and here is Skat when in Stockholm;
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Last edited by AMG; 09-09-2005 at 03:56 AM..
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