| 摘要 |
The Multiple Concavity Surfing Ship and Transition System is an improvement for a surfing ship that generates a singular water wave and rides on its crest efficiently at high speeds. The improved system now adds provisions to aid in the ship's transition in lifting the ship upwards from its low speed displacement mode deep in the water to its high speed surfing mode on top of the ocean surface and to enhance stability and control during transition and cruise. Two complementary features to assist in this transition are provided, the first comprising one or more pairs of hydrofoils on either side of the ship near its bottom to increase surface area and span to lift the ship upwards at the low speed beginning of its transition, and second, one or more sets of concavities preferably symmetric nested concavities, of increasing camber on the bottom of the ship itself to reduce the wetted area in a controlled manner as the ship approaches its cruise mode at high speeds. The hydrofoils are retractable, enabling their extension for transition and cruise and their retraction for high speed cruise, if desired, as well as displacement operation in harbors and for docking. Intermediate positions of the hydrofoils also offer the possibility of dihedral to aid in roll stability. The nested bottom concavities are bounded by forward ramps and aft steps to control water contact, with the increasing camber towards the center of the nest matching the convex slope increase of the surfing wave with speed. A flexible plate bridging the innermost concavity changes its camber to match the convex slope of the surfing wave during cruise. Multiple sets of bottom concavities enhance the longitudinal stability and/or control of the ship at cruise and relaxes loading requirements about the center of gravity of the ship. Multiple pairs of hydrofoils similarly enhances stability and/or control during transition.
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