Concept Design Report for a Low draft Stabilized - High Speed Connector (LDS-HSC) Vessel for the ONR High Speed Sea Lift (HSSL) Program
2007
Stammnitz, Volker | Lavis, David | Buley, Greg | Purnell, John | Gupta, Manish | Clayson, Chris
The subject vessel is a concept ship conceived by CDIM-SDD that can easily transform itself to operate either as a Catamaran, a SWATH, or as an SES. The catamaran was chosen because of its good high-speed efficiency and seakeeping performance, low risk, low cost, good payload arrangeability and compatibility with the SES concept. The SWATH was chosen because of its inherently good seakeeping, and the SES because of its ability to afford shallow draft with cushion end seals deployed for gaining access to Austere Ports, and to combine with the SWATH to enhance seakeeping at low speed fore transferring cargo to and from a sea base in heavy seas. This latter combination is achieved by ballasting the vessel to transform from a Cat mode to a SWATH mode in combination with deploying the cushion end seals and a mid-cushion divider, and supplying air to the cushion as in an SES with active control of cushion air flow and, hence, control of cushion pressure fore and aft of the divider that provides significant dynamic control of ship pitch and heave in a seaway.
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