Title:
RUDDER
Document Type and Number:
WIPO Patent Application WO/2022/044644
Kind Code:
A1
Abstract:
[Problem] To provide a rudder for generating high thrust in order to reduce energy consumption of a watercraft during navigation. [Solution] Provided is a rudder formed of a first rudder which is arranged on both sides of a first propeller and a second rudder which is arranged on both sides of a second propeller. The first rudder is formed of a left rudder arranged on the left side of the first propeller and a right rudder arranged on the right side of the first propeller in the rear view. The second rudder is formed of a left rudder arranged on the left side of the second propeller and a right rudder arranged on the right side of the second propeller in the rear view. Each of the left rudders of the first rudder and the second rudder is formed of a first left rudder portion which extends in the left-and-right direction, a second left rudder portion which curves toward the lower left side from a left end of the first left rudder portion, and a third left rudder portion which extends downward from a bottom end of the second left rudder portion in the rear view. Each of the right rudders of the first rudder and the second rudder is formed of a first right rudder portion which extends in the left-and-right direction, a second right rudder portion which curves toward the lower right side from a right end of the first right rudder portion, and a third right rudder portion which extends downward from a bottom end of the second right rudder portion in the rear view. The first left rudder portion and the first right rudder portion of the first rudder are arranged above and apart from the top end of the outer peripheral line of the first propeller by a distance longer than 10-20% of the diameter of the propeller in the rear view. The first left rudder portion and the first right rudder portion of the second rudder are arranged above and apart from the top end of the outer peripheral line of the second propeller by a distance longer than 10-20% of the diameter of the propeller in the rear view.
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Inventors:
KURIBAYASHI SADATOMO (JP)
SASAKI NORIYUKI (JP)
SASAKI NORIYUKI (JP)
Application Number:
PCT/JP2021/027488
Publication Date:
March 03, 2022
Filing Date:
July 26, 2021
Export Citation:
Assignee:
K SEVEN KK (JP)
International Classes:
B63H5/07; B63H5/08; B63H25/38
Foreign References:
| JP2020090233A | 2020-06-11 | |||
| JP2020044876A | 2020-03-26 | |||
| JP2011168251A | 2011-09-01 | |||
| JP2016097711A | 2016-05-30 | |||
| JPH01501384A | 1989-05-18 |
Attorney, Agent or Firm:
NAGAI INTERNATIONAL PATENT BUREAU (JP)
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