Patent ID: 8166899

Claim:
An air cavity vessel in which air is injected into a bottom thereof to form an air layer, the air cavity vessel comprising: transverse partitions that are installed on a bottom of a recess formed in a bottom portion of the vessel to partition the bottom portion of the vessel in a transverse direction; longitudinal partitions that are installed on the bottom of the recess formed in the bottom portion of the vessel to partition the bottom portion of the vessel in a longitudinal direction; spatial areas that are defined in a grid pattern by the transverse partitions and the longitudinal partitions; a hydraulic actuator that adjusts a height of at least one of the transverse partitions and the longitudinal partitions corresponding to a thickness of an air layer formed in the bottom portion of the vessel; an air supply unit that is installed in a forebody of the vessel and supplies compressed air into the spatial areas, an amount of the compressed air supplied into the spatial areas being controlled by a hydraulic part of the air supply unit; and means for supplying the compressed air to the air supply unit, wherein the air layer is formed in multiple parts on the bottom portion of the vessel.