A horizontal shaft rotor and a watercraft having the rotor

Abstract

A horizontal shaft rotor comprising a lift-type blade, wherein, in the lift-type blade 1, a front face 3D in a flow receiving direction is a large arcuate bulging face in a string direction, a rear face 3E in a discharge direction is made smaller than the bulge of the front face 3D, so that, when the blade rotates, a high speed flow passing along the string direction of the front face from the rear edge portion 3G to the back face 3E direction generates propulsive force.

1 . A horizontal shaft rotor comprising a lift-type blade, in the lift-type blade, a front face in a flow receiving direction is a large arcuate bulging face in a string direction, a rear face in a discharge direction is made smaller than the bulge of the front face, when the blade rotates, a high speed flow caused according to the Coanda effect passing along the string direction of the front face from a rear edge portion to a back face direction generates propulsive force. 
     
     
         2 . The horizontal shaft rotor according to  claim 1 , wherein, in the lift type blade, the back face in the discharge direction at the blade root portion is linear in the string direction and parallel to the rotation direction, the back face is gradually increased inclination to a front face direction from the blade root portion to a maximum string length portion, and from the rear edge portion to a front edge portion. 
     
     
         3 . The horizontal shaft rotor according to  claim 1 , wherein, in the lift-type blade, in a side view, a thickness gradually decreases from the blade root portion to a blade tip portion, and the front face gradually inclines to the back face direction from the blade root portion to the blade tip portion. 
     
     
         4 . A watercraft comprising the horizontal shaft rotor according to  claim 1 , wherein the horizontal shaft rotor is mounted on a rotor shaft of a rotor housing disposed in the watercraft so that a tip of an inclined portion of a blade is oriented in a bow direction. 
     
     
         5 . The horizontal shaft rotor according to  claim 2 , wherein, in the lift-type blade, in a side view, a thickness gradually decreases from the blade root portion to a blade tip portion, and the front face gradually inclines to the back face direction from the blade root portion to the blade tip portion. 
     
     
         6 . A watercraft comprising the horizontal shaft rotor according to  claim 2 , wherein the horizontal shaft rotor is mounted on a rotor shaft of a rotor housing disposed in the watercraft so that a tip of an inclined portion of a blade is oriented in a bow direction. 
     
     
         7 . A watercraft comprising the horizontal shaft rotor according to  claim 3 , wherein the horizontal shaft rotor is mounted on a rotor shaft of a rotor housing disposed in the watercraft so that a tip of an inclined portion of a blade is oriented in a bow direction.