Patent ID: 8881667

Claim:
An underwater moving body, comprising: a body; and a cavitation device for generating a cavity which encloses an outer circumferential surface of the body, wherein the cavitation device comprises: a plurality of flap-up/down members, which members are rotatably connected to the body, disposed to cover the outer circumferential surface, and disposed in a circumferential direction and a lengthwise direction of the body; and a plurality of pressing modules, wherein each pressing module is configured to flap up a respective flap-up/down member to generate the cavity associated with the respective flap-up/down member, when the flap-up/down members are being rotated to incline from the outer circumferential surface, wherein the plurality of flap-up/down members comprises a plurality of front flap-up/down members and a plurality of rear flap-up/down members, wherein the rear flap-up/down members are disposed in the lengthwise direction inside the cavity formed due to the front flap-up/down members, wherein the cavitation device is configured to be multi-functional, wherein the plurality of flap-up/down members are configured to flap up in a predetermined angle range, in which the friction resistance of the moving body due to water viscosity is smaller than the friction resistance of the moving body due to water viscosity when the plurality of flap-up/down members are not in the predetermined angle range, and wherein a braking power is generated by the flapping-up movement of each flap-up/down member at a maximum angle of the angle range.