FIELD: shipbuilding. SUBSTANCE: hull is provided with parallel middlebody; freeboards are vertical and are provided with wedge stops for centerboards which are articulated to vertical freeboards and are provided with rope drive. Besides that, underwater portion of each centerboard is provided with swivel flap whose height is equal to at least one fifth of chord of centerboard cross-section. Hull is provided with flat portion of bottom with streamlined bracket fitted at its level for securing the lower wedge stop. EFFECT: enhanced reliability. 3 cl, 5 dwg
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