Title:
CONTRA-ROTATING PROPELLER SHIP WITH COURSE KEEPING FUNCTION
Document Type and Number:
Japanese Patent JP3780342
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To properly provide a course keeping function by utilizing a slight difference in the number of rotations between a front propeller and a rear propeller while basically suppressing the occurrence of swirl flow to the rear by a contra-rotating propeller by turning attention to a fact that the swirl flow acts on one side surface of an upper strut to allow a steering action when the propeller is installed at the front end of a pod supported at the lower end of the strut.
SOLUTION: In this contra-rotating propeller 5, the pod 3 is fitted to the lower end of the strut 2 projected from a stern part 1 to the lower side of a ship bottom. The front propeller 5a and the rear propeller 5b rotatingly driven by motors 3a and 3b in the pod 3 are disposed at the front of the pod 3. When a hull is cruised aslant, the swirl flow generated by a difference in the number of rotations between the propellers 5a and 5b is applied to one side surfaces of the strut 2 and a fin plate 2a so that the course keeping function can be provided.
Inventors:
Numano Masayoshi
Application Number:
JP2003041837A
Publication Date:
May 31, 2006
Filing Date:
February 19, 2003
Export Citation:
Assignee:
Japan Maritime Research Institute
International Classes:
B63H5/10; B63H5/125; B63H25/48; (IPC1-7): B63H5/10; B63H5/125
Domestic Patent References:
| JP6263092A | ||||
| JP8207895A |
Foreign References:
| DE19647948A1 |
Attorney, Agent or Firm:
Yoshihiko Iinuma
Karasawa Yukichi
Karasawa Yukichi