ADVANCED HULLFORMS
to a high-speed surface connector (HSC) for shipment of cargo directly to forces ashore or to shallow-draft ports. ‘For our design effort, the primary issue was
the need to mitigate wave-induced relative motions between ships in Sea States 4/5. This was necessary to enable safe and rapid loading and unloading of heavy armored combat vehicles between ships at sea,’ said CDI, noting that this has been recognised by the US Navy as one of the more serious challenges, for which numerous techniques have been, and are being, tried, with mixed success so far. ‘The objective of our design effort, therefore,
The Navatek proposal for the T-Craft includes an innovative Captive–Air Amphibious Transporter called C-AAT which will be carried aboard the ship.
was to conceive of a near-term, affordable, Low-Draft, Stabilised (LDS) High-Speed Surface Connector (HSC) that could make motion compensation requirements for systems now being developed for cargo transfer, less demanding, and therefore result in a higher probability of success in satisfying overall seabasing mission objectives,’ said the company. The problem is, of course, that there are no
existing types of high-speed ships that can achieve this objective because, notionally, the HSC should ideally:
of hull resistance and seakeeping motions, and loads for large vessels that the US Navy is exploring for high-speed sealift. Such vessels must also be capable of servicing sea base facilities and austere ports, and as part of this effort, CDI developed the concept design of a transformable hybrid vessel, a sub-scale model of which was tested in December 2006 at the Naval Surface Warfare Center (NSWC)
Carderock. The results of these tests will be used to help validate the various Computational Fluid Dynamic (CFD) codes being developed. As CDI notes, one of the more serious
challenges for supporting and sustaining the operations of a military marine expeditionary force ashore will be the safe, reliable, and efficient transfer of heavy equipment and cargo at sea; that is, from a seabase, or MPF (F) ship,
• Be capable of efficiently transporting very large payloads (4000tonnes) at high speeds (greater than 40knots) over long distances (greater than 4000nm).
• Have shallow draft to permit access to as many foreign ports as possible.
• Have low pitch, heave, and roll motions in response to heavy seas.
WARSHIP TECHNOLOGY MAY 2007
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