METHOD OF BREAKING ICE COVER Russian patent published in 2000 - IPC

FIELD: shipbuilding; ships breaking ice cover in shallow waters. SUBSTANCE: ship moves perpendicularly to edge of ice cover at speed corresponding to maximum wave resistance. Plates are mounted symmetrically on ship's sides at distance from one another equal to length of gravitational waves but not exceeding their height in order to increase amplitude of transversal waves of fore sector. First pair of plates is mounted in area of first crest of bow wave. Number of pairs of plates is equal to number of lengths of waves present along ship's length. Plates are secured on vertical axles for turn through definite angle and motion along ship's sides. Ship is turned through 180 deg before shallow water without bringing her in contact with solid ice and she moves in this direction. EFFECT: enhanced efficiency of breaking ice. 2 dwg