What is a Swath?
SWATH is the abbreviation of Small Waterplane Area Twin Hull, the discription of an innovative hull-concept for smooth service in rough seas. The buoyancy of a SWATH-ship is provided by 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 a minimum of the ship only is exposed to the lifting forces of the waves.
• sensational smooth ride and avoidance of seasickness
• drastically reduced ship motions
• the possibility to ride with nearly top speed in rough sea
• extended all-weather operation capability, compared to conventional ships of simiar size
A Maximum of Passenger Comfort and Crew Operability
If the human body is exposed to acceleration the result will be discomfort under certain circumstances. On board a ship the vertical acceleration caused by heaving and pitching motions is the dominating parameter for "seasickness". According to ISO 2631 severe discomfort may occur for passengers of smaller and fast monohull- or catamaran ships, if they are exposed to vertical accelerations in the magnitude of 20% of the earth´s gravity constant 0,2g for more than 30 minutes. Due to its unique hull concept the vertical accelerations of a Swath (even a smaller one) are by far lower than those of the compared conventional ship and clearly under the discomfort bounderies for passengers even in seastate 5 (abt. 3m wave hight). A fast monohull or catamaran can only reduce te vertical acceleration- (and discomfort) level by reducing speed (or changing course) in rough sea, even if ride control fins should be applied, while a Swath can operate close to its top speed offering an even more comfortable enviroment for passengers and crew.
SWATH advantages for hydro-acoustic survey
• greater comfort for crew and scientists
• less sea-sickness
• more efficient working
• genuine recovery on free watch
• greater speeds at sea
• less time required for prescribed survey
• significantly less bubble formation under foreship, and therefore less disturbance of instruments