Boat

Abstract

The purpose of the present invention is to provide a boat capable of obtaining a propulsion force in a discretionary direction. A boat is provided with Arneson drives which drive propellers by means of propeller shafts via universal joints, and which control the left and right directions of the propellers by means of hydraulic cylinders. Two of the Arneson drives are provided, and the Arneson drives are respectively provided to the left and right sides of a hull. The propellers are controlled in the left and right directions in a mutually independent manner.

1 . A vessel comprising Arneson Surface Drives, which are provided on a port side and a starboard side, and each of which drives a propeller by a propeller shaft via a universal joint and controls the propeller in a horizontal direction by a hydraulic cylinder, wherein
 the universal joint on each of the port side and the starboard side is provided in a middle of the propeller shaft, a base end of the hydraulic cylinder on each of the port side and the starboard side is pivotally supported at a rear end of the vessel on a side closer to a broadside with respect to the propeller shaft, and a distal end of the hydraulic cylinder on each of the port side and the starboard side is pivotally supported on a side closer to the propeller with respect to the middle of the propeller shaft on each of the port side and the starboard side.   
     
     
         2 . The vessel according to  claim 1 , wherein control is performed such that a current slidable region of the hydraulic cylinder is set as entirety of a subsequent slidable region when there is an abnormality in the hydraulic cylinder.