Ship Equipped with Additional Propeller

Abstract

A ship is configured to obtain propelling force by driving a designed propeller with a main engine. A vertical tunnel is formed at a bow portion to pass through a ship bottom. A lateral tunnel is formed in communication with the vertical tunnel. An additional propeller device has an additional propeller and a driving unit for the propeller. The additional propeller device is configured such that the additional propeller can turn around a vertical center line of the vertical tunnel. The additional propeller is configured to be capable of vertically movable from below the ship bottom to a height position of the lateral tunnel. When the additional propeller is at the height position of the lateral tunnel, the additional propeller is configured to follow the lateral tunnel.

1 . A ship equipped with an additional propeller, the ship being configured to obtain propelling force by driving a designed propeller with a main engine, the ship comprising:
 a vertical tunnel that is formed at a bow portion to pass through a-ship bottom;   a lateral tunnel that is formed in communication with the vertical tunnel;   an additional propeller device that is provided, which has a propeller and a driving unit for the propeller, in the vertical tunnel; and   a hanging unit that is provided to hang the additional propeller device from above a water level inside the vertical tunnel,   wherein the additional propeller device is configured such that the additional propeller can be vertically movable from below the ship bottom to a height position of the lateral tunnel,   in a state with hanging by the hanging unit, the additional propeller device is provided so as to be capable of turning around a vertical center line of the vertical tunnel, and   when the additional propeller of the additional propeller device is at the lateral tunnel height position, the additional propeller is configured to follow the lateral tunnel.   
     
     
         2 . The ship according to  claim 1 , wherein when the additional propeller of the additional propeller device is at the lateral tunnel height position, the additional propeller device is configured so as to be mountable on a support portion protruding inward in the vertical tunnel. 
     
     
         3 . The ship according to  claim 1 , wherein when the additional propeller of the additional propeller device is located below the ship bottom, the additional propeller device is configured to be mountable on a support portion protruding inward in the vertical tunnel. 
     
     
         4 . The ship according to  claim 1 , wherein operating condition is selectable between regular operating condition in which propelling force is obtained by driving the designed propeller and the other operating condition in which propelling force is obtained by driving the additional propeller. 
     
     
         5 . The ship according to  claim 1 , wherein the additional propeller is a duct propeller. 
     
     
         6 . The ship according to  claim 1 , comprising a water level detecting unit that monitors or detects variation of the water level inside the vertical tunnel. 
     
     
         7 . An operating method for a ship equipped with an additional propeller, the ship being configured to obtain propelling force by driving a designed propeller with a main engine, the operating method comprising:
 a vertical tunnel that is formed at a bow portion to pass through a ship bottom;   a lateral tunnel that is formed in communication with the vertical tunnel;   an additional propeller device that is provided, which has a propeller and a driving unit for the propeller, in the vertical tunnel; and   a hanging unit that is provided to hang the additional propeller device from above a water level inside the vertical tunnel,   wherein the additional propeller device is configured such that the additional propeller can be vertically movable from below the ship bottom to a height position of the lateral tunnel,   in a state with hanging by the hanging unit, the additional propeller device is provided so as to be capable of turning around a vertical center line of the vertical tunnel,   when the additional propeller of the additional propeller device is at the lateral tunnel height position, the additional propeller is configured to follow the lateral tunnel, and   the ship is propelled by driving the designed propeller in a load condition, and the ship is propelled by driving at least the additional propeller in an unload condition.   
     
     
         8 . The operating method according to  claim 7 , wherein when the additional propeller is raised to the lateral tunnel height position, the additional propeller is oriented in a direction along the lateral tunnel, and the ship is made to dock at a pier or a port or leave from the pier or the port.