Dcd Inc.

Albert D Kruglov

Vladimiz Barbazash

Boris E Rapoport

Yury M Ukrainskiy

Multiple-hull catamaran vessels equipped with hydrofoils have two hulls connected by a deck. Transverse to the hulls below the waterline are three or more hydrofoils, the trim bow and stern hydrofoils, and the relieving middle hydrofoil or a group of hydrofoils. The bow and stern hydrofoils are mounted at a distance not less than 30% and 20% of the hull length to the bow and stern, respectively, from the center of mass. Lift arising on all hydrofoils when sailing at a maximum calculated speed in calm sea reaches 60-70% and in calculated rough seas 20-40% of the catamaran's full weight. The bow foil, middle and stern foils account for 0.05-0.15; 0.15-0.30; 0.10-0.25 shares of the catamaran's full weight, respectively. When sailing in rough sea and during vertical travels of the hulls (vertical rocking), 'submergence--emergence' takes place which leads to 'increase--decrease' of the lift thereby reducing vertical travel amplitude. When the vessel pitches about its lateral axis, the bow hydrofoil and the stern hydrofoil take turns being near the free surface at the moment the other is considerably submerged. A righting moment arises facilitates a decrease of pitching amplitude.

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St. Petersburg, Russia

Albert D Kruglov