Abeking & Rasmussen

What is a SWATH?

SWATH stands for Small Waterplane Area Twin Hull, an innovative hull concept for smooth service in rough seas. The buoyancy of a SWATH ship is provided by its submerged torpedo-like bodies, which are connected by single or twin struts to the upper platform. The cross-section at sea surface level is minimized and thus only a minimum of the ship is exposed to the lifting forces of the waves. 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 sea.
The first demonstration SWATHs were built in the late 1970ies; initial problems reported were caused by “trial and error” approaches. Give today’s possibilities of computer technology, sophisticated and optimized SWATH design are now feasible; motions in rough seas can be predicted and reliably tuned during the project phase - by those who know how!
Abeking & Rasmussen has developed SWATH Technology systematically on the background of its longstanding experience in hydrodynamics, lightweight construction, special materials and leading edge ship design.
With the know-how gained from full-scale service data of reference ships and special software tools A&R is now in a position to design and deliver SWATH ships reliable for tough everyday duty – a longterm valuable investment – under the brand name SWATH@A&R.

Comparison of Waterline Area