![](http://3.bp.blogspot.com/_iKn87SvIojM/TIk0hyDsPwI/AAAAAAAAANA/azsY6ayCX5k/s200/swath_300.jpg)
![](http://1.bp.blogspot.com/_iKn87SvIojM/TIkz7IhN_YI/AAAAAAAAAM4/hCzqKdPuFwo/s200/SWATH_pilot_boat_in_Rotterdam.jpg)
SWATH (small waterplane area twin hull) is an intriguing boat design in effect floating a boat on top of a semi-submerged submarine. The lower hull cuts through the waves at a constant depth, the boat rides smooth and level cutting through the waves.
http://www.brighthub.com/engineering/marine/articles/60455.aspx
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