INFLATABLE BOAT Russian patent published in 1998 - IPC

FIELD: water transport. SUBSTANCE: inflatable boat includes inflatable sides, fore and aft extremities made from elastic envelope cut in form of round cylinders and bottom secured to sides and to fore and aft extremities. Boat is provided with device for change of relationship between height of side and its width; this device is located on at least one section of each side and is made in form of horizontal flexible diaphragm located in center of section and secured over entire length of envelope dividing sections of sides into upper and lower zones which are equal over perimeter of section. Outer surface of side on these section is made in form of cylinder with parallel bases in form of closed flat algebraic curve, type Cassinian oval with waist having vertical axis and waist in horizontal plane. Distance between vertices of oval along its vertical axis exceeds diameter of base of adjoining sections of round cylinders and distance between any points of oval lying on one horizontal line is less than diameter of base of adjoining sections of round cylinders. Perimeter of curve of Cassinian type oval with waist is equal to perimeter of base of round cylinder; central axis of cylindrical surface with bases having form of Cassinian oval with waist coincides with central axis of adjoining round cylinders. EFFECT: enhanced reliability. 3 cl, 6 dwg