30-FOOT CRUISING RACING SAIL CATAMARAN Russian patent published in 1996 - IPC

FIELD: sport shipbuilding. SUBSTANCE: catamaran has two hulls which are so interconnected that ratio of length L over DWL each of them to breadth B of catamaran measured between keel lines does not exceed 1.84 and satisfies conditions L/12<l<3L/25, where 1 is maximum width of working waterline. Catamaran CG is located at distance from stern not exceeding 0.45 L. Curvilinear surfaces of hulls at section of 0.23-0.24 L from stern to bow are formed by arcs of circle of varying radius reducing in the same direction; ratio of radius R₁ in stern to final radius R₂ ranges from 1.18 to 1.22. EFFECT: enhanced reliability. 4 cl, 7 dwg