SWATH hull trimaran

Has anybody idea how SWATH hull like in the picture would behave with parameters:

Loa 9m
Displ. 2T
Speed 35 knt

Thanks!

http://www.maritimejournal.com/news...nergy/new-windfarm-vessel-concept-from-norway

 

I do not know if I understand you but can not be assimilated/compared SWATH and SWASH. They are different concepts and some of the functions of one can not be performed by the other.
What do you mean specifically?

 

VeelaidVahur

Firstly you're numbers of displacement 2 tonne is clearly incorrect.

How can you build a swath hull of 9.0m length with ballast systems fuel, propulsion outfitting etc etc for 2 tonne. Its hard pushed to build a 9.0m simple monohull for 2 tonne all up, let alone a swath hull.

The picture is more a tri-swath than a swath. Since by definition a swath only has 2 hulls, not 3.

 

here, its a real boat that exists

25m version
http://www.fjellstrand.no/flyers/flyer_1690.pdf

and 30m version

http://www.fjellstrand.no/flyers/flyer_1694.pdf

 

Kerosene, those are trimarans (three hulls), nothing to do witn SWATH (twin hull) or SWASH (single hull)

 

I just added the links, not making any claims.
The manufacturer uses term "swath like", original link uses term SWASH.

Its interesting concept anyway.

 

SWATH stands for ‘Small Waterplane Area Twin Hull’, an innovative concept for smooth service in rough seas. The buoyancy of a SWATH ship is provided by two submarine hulls connected to the upper platform by twin narrow struts from each of the submarine hulls, as shown in the image below. The cross-sectional area at the sea surface is approximately 1/6th that of a comparable size yacht and thus only a minimum part of the ship is exposed to the lifting forces of the waves while 5/6 of the buoyancy is on the submarine hulls. Additional stability is provided by the SWATH’s broad beam which is twice that of a comparable yacht and by four large stabilizers controlled by a sophisticated computer system. The idea of SWATH was taken from the principle of semi-submersible offshore rigs, which are designed to provide a working platform with minimized motions in open seas. As scuba divers and submariners will attest, one needs to be only slightly under the surface of the sea to be in a calm environment regardless of conditions on the sea surface.

http://www.yachtsilvercloud.com/

 

That has nothing to do with how a SWATH works.

 

Submerged Buoancy

There have been attempts to get the main hull of a Multihull lifted by "submerged buoyancy". They are documented and discussed by members of the Amateur Yacht Research Society (AYRS London). For instance:



Please scroll down to "Submerged buoyancy" where you will find more references: http://www.dcss.org/ayrs/6.html,
http://www.ayrs.org/ayrslist.htm
http://www.ayrs.org/repository/AYRS036.all_A5.pdf Please have a look at pp 47-48.

 

As correctly noted in the article linked in OP, the concept is an ama-stabilized SWASH. Producing a design of one at only 9m LOA would be a real challenge and making it go 35kts only adds to that challenge; that center hull isn't easy to push to high speeds.

 

I suppose one could say that they're working a similar distinction that stabilized monohulls are in that the amas are less about displacement but stabilization. Of course examples of various native trimaran canoes of old could likewise be called stabilized monohulls too if that was all there is to it.

Maybe there's some percentage of overall length or displacement that some have in mind which separates an ama for stabilization from one for displacement?