JPS5663598A - Contra-rudder for small boat - Google Patents
Contra-rudder for small boatInfo
- Publication number
- JPS5663598A JPS5663598A JP14090379A JP14090379A JPS5663598A JP S5663598 A JPS5663598 A JP S5663598A JP 14090379 A JP14090379 A JP 14090379A JP 14090379 A JP14090379 A JP 14090379A JP S5663598 A JPS5663598 A JP S5663598A
- Authority
- JP
- Japan
- Prior art keywords
- rudder
- contra
- plate
- rudder plate
- propeller
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/38—Rudders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
- B63H25/06—Steering by rudders
- B63H25/38—Rudders
- B63H2025/388—Rudders with varying angle of attack over the height of the rudder blade, e.g. twisted rudders
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Ocean & Marine Engineering (AREA)
Abstract
PURPOSE: To improve the propulsion efficiency and to make the manufacturing of a contra-redder easier by having the upper half and lower half of the contra-rudder at respectively uniform twist angle.
CONSTITUTION: A contra-rudder 31 is divided into an upper half and lower half by the center line of a propeller and consists of a stream lined upper rudder plate 311 and lower rudder 312, a tubular lower shaft 326 which also function a constituting member of the rudder shaft, supporting plates 313, 314, 315 and 316 and auxiliary plate 317 all of which designating the shape of the respective rudder plates 311 and 312 and being structure members thereof. The rear part of the upper rudder plate 311 is twisted counterclockwise looking from the top uniformly from its top end to bottom end and the lower rudder plate 312 is similarly twisted clockwise. Thus, the rotating energy in the stream generated by propeller is converted to the forward thrust on the entire surface of the respective rudder plate to increase the thrust efficiency. The quandric surface of the entire rudder plate makes the manufacturing easier.
COPYRIGHT: (C)1981,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14090379A JPS5663598A (en) | 1979-10-30 | 1979-10-30 | Contra-rudder for small boat |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP14090379A JPS5663598A (en) | 1979-10-30 | 1979-10-30 | Contra-rudder for small boat |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5663598A true JPS5663598A (en) | 1981-05-30 |
Family
ID=15279477
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP14090379A Pending JPS5663598A (en) | 1979-10-30 | 1979-10-30 | Contra-rudder for small boat |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5663598A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH037695A (en) * | 1989-06-05 | 1991-01-14 | Japan Hamuwaaji Kk | Ship rudder and its fabricating method |
EP2263936A1 (en) | 2009-06-17 | 2010-12-22 | Daewoo Shipbuilding & Marine Engineering Co., Ltd | Rudder for ship |
JP2019177813A (en) * | 2018-03-30 | 2019-10-17 | 国立研究開発法人 海上・港湾・航空技術研究所 | Rudder device and vessel |
-
1979
- 1979-10-30 JP JP14090379A patent/JPS5663598A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH037695A (en) * | 1989-06-05 | 1991-01-14 | Japan Hamuwaaji Kk | Ship rudder and its fabricating method |
EP2263936A1 (en) | 2009-06-17 | 2010-12-22 | Daewoo Shipbuilding & Marine Engineering Co., Ltd | Rudder for ship |
JP2019177813A (en) * | 2018-03-30 | 2019-10-17 | 国立研究開発法人 海上・港湾・航空技術研究所 | Rudder device and vessel |
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