US Patent 9254898 Hull robot with rotatable turret

A hull robot includes a turbine subsystem actuatable by fluid moving past the hull, a drive subsystem for maneuvering the robot about the hull, and an adjustment subsystem for either the turbine subsystem or the drive subsystem. A controller is configured to operate the adjustment subsystem to adjust the position of the turret subsystem relative to the drive subsystem until fluid flowing past the hull results in an optimal flow of fluid with respect to the turbine subsystem.