| 摘要 |
A vessel includes an heavy loaded catamaran, one or several movable buoyant roll-on/roll-off platform(s) ( 3 ); a moving element is provided for draft variation in heavy deep seas so that the platform(s) ( 3 ) may be raised or lowered between the hulls thereby selectively changing the flotation of the vessel. In the upper position, the vessel is a deep-sea catamaran, in an intermediate position the platform(s) is buoyant and a canal is formed between platform bottom and catamaran keels, in the lower position, platform bottom and catamaran are even-keel converting the catamaran in a shallow water craft, in the lowest position, the catamaran is raised above water for docking.
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