METHOD OF BREAKING ICE COVER Russian patent published in 2002 - IPC

FIELD: ice-breaking jobs. SUBSTANCE: submarine ship 2 trimmed by bow is set in motion under ice 1 at safe depth and resonance speed exciting flexural gravitational waves 3; during motion of ship 2, pressure under first crest 5 of wave after stern is additionally increased by directing water mass 4 thrown by ship's propeller 6 under crest. Said operations give rise to additional flexural gravitational waves 7 whose interference with main flexural gravitational waves 3 increases amplitude of resulting flexural gravitational waves 8. Water mass 4 is thrown by ship's propeller 6 at frequency equal to frequency of flexural gravitational waves; to this end, propeller 6 is periodically started and stopped. EFFECT: enhanced efficiency of ice breaking. 1 dwg