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S.W.A.T.H. Technology

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(@powergroove)
Posts: 1224
Master Chief Registered
Topic starter
 
[#17075]

Anyone see the monohull bashing segment on Discovery Channel the other night? Apparently this gentlemen named Creed designed a multihull that had a huge underwater displacment in the shape of a submarine hull that kept the boat stable in almost all conditions. He was laughed at in his time, but now there are a few boast built with this technology that seem to prove his point. SWATH (small waterplane area twin hull design). looks ugly, but sure worked well in the demonstartions Vs. monohulls. What was best was the bashing of monohulls. Ive never heard the word monohull used in any other place other than this forum with such disrespect. It was great! Multihulls do rule!


 
Posted : February 24, 2006 10:53 am
 jrg
(@jrg)
Posts: 35
Member
 

What was the name of the show??? I'm looking for the re-run already.

jrg


 
Posted : February 24, 2006 12:17 pm
(@s-b-cats)
Posts: 167
Member
 

I would see the SWATH ships down in San Diego that the Navy had, pretty interesting. They can change the amount of ballast in the twin hulls and change the height above the water for the different conditions too....


 
Posted : February 24, 2006 12:24 pm
Jake Kohl
(@jake)
Posts: 11744
Three Star Admiral Registered
 
Quote
What was the name of the show??? I'm looking for the re-run already.

Likewise - Tivo remote standing by.


 
Posted : February 24, 2006 1:14 pm
(@stags209)
Posts: 24
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I saw it on the discovery channel. The guy filled the submarine hulls with water so they would stay sumergerd. Cool show, It is called mega machines i think.

http://www.navegantegroup.com/swathrendering.gif

http://www.marinetalk.com/images/02-07-19/swath.jpeg


 
Posted : February 28, 2006 6:25 pm
MaryAWells
(@maryawells)
Posts: 5485
Member
 

Is that the same thing that Tom Clancy describes in his book "Splinter Cell"?

Quote from the book. Now that I know there really is such a thing, I am assuming that Clancy did his research:

Quote
"SWATH gives a craft the ability to deliver big-ship platform steadiness and ride quality in a smaller vessel and the capability to sustain a high proportion of its normal cruising speed in rough head seas. The waterplane is the horizontal-plane cross-section of a ship's hull at the water surface. Thus, the boat has two submarinelike lower hulls completely submerged below the surface; above the surface it resembles a catamaran. Ship motions are caused by the waves on the ocean surface, which produce forces on the hull that decrease rapidly as the hull is moved farther below the surface, as with a submarine. Wave-exciting forces can also be made smaller if the amount of waterplane area at the design waterline is decreased. However, the objective of SWATH is not to minimize ship motions at the expense of speed/power or payload capabilities. Instead, the relative proportions for the strut waterplane area and submerged hulls are selected to reduce motions and accelerations well below accepted criteria for seasickness or onset of degraded performance of personnel or equipment. All SWATH crafts will have less than 50 percent as much waterplane area as a monohull of equal displacement."

Does that sound like what they were talking about on the Discovery Channel?


 
Posted : February 28, 2006 6:55 pm
(@powergroove)
Posts: 1224
Master Chief Registered
Topic starter
 

Thats exactly it. Cool show, catch it if you can.


 
Posted : March 2, 2006 12:39 pm
Gary P. Joyce
(@gjoyce)
Posts: 34
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For at least 10 years (probably longer) there's been a liveaboard dive boat called the Nekton Pilot that is a SWATH boat ... key in Nekton Pilot for a looksee ...

gary


 
Posted : March 3, 2006 9:27 am
(@Anonymous 2658)
Posts: 92
 

David et al,
have a look at this movie to see the comparison of a monohull with a SWATH.
http://www.abeking.com/flash.html , then you go under ships and in the right lower corner go under SWATH.
Enjoy the movie!

Fritz
Flensburg, Germany


 
Posted : March 3, 2006 1:44 pm
(@wyndsurf2000)
Posts: 1137
Master Chief Registered
 

This show was replayed last night. It was amazing to see the difference when the SWATH ship was running side by side with the monohull. SWATH ship had a drink of water sitting on a counter while out the window in the backround the monohull was getting beat to he** by the seas. Really cool technology!


 
Posted : March 16, 2006 4:46 pm
Bob Webbon
(@lobo)
Posts: 2
Newby Registered
 

SWATH tech is very good but it's damn expensive. Works best for station keeping. It's not that fast and sucks on fuel economy. But for certain needs it's very forgiving and I wouldn't have it any other way. Did I mention maintenance is a bear!
Bob


 
Posted : March 17, 2006 1:19 am
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