GB755629A - Improvements relating to single-rotor helicopters - Google Patents
Improvements relating to single-rotor helicoptersInfo
- Publication number
- GB755629A GB755629A GB3586453A GB3586453A GB755629A GB 755629 A GB755629 A GB 755629A GB 3586453 A GB3586453 A GB 3586453A GB 3586453 A GB3586453 A GB 3586453A GB 755629 A GB755629 A GB 755629A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blades
- rotor
- axis
- advancing
- centre
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/04—Helicopters
- B64C27/06—Helicopters with single rotor
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Toys (AREA)
Abstract
755,629. Helicopters. SHORT BROS. & HARLAND,Ltd. Jan. 5, 1955 [Dec. 24, 1953], No. 35864/53. Class 4. In a helicopter of the kind incorporating only a single rotor which is of the hingeless or non- articulated type or which is of the type having articulated blades whereof the flapping hinges are off-set from the axis of rotation by an appreciable proportion (say from 15 to 20 per cent) of the radius of the rotor disc and wherein cyclic pitch control is provided to load the advancing blade more heavily than the retreating blade, the centre of gravity is off-set with respect to the axis of the rotor on the side at which the blades advance. The embodiment shown has non-flapping blades and the position CG of the centre of gravity is located forward and off-set from the rotor axis R on the side of an advancing blade B. To maintain lateral stability the blades have a greater pitch angle when advancing than when retreating which has the effect of increasing the loading of the blades when advancing and thereby moving the aerodynamic centre of the rotor sideways to lie in a vertical longitudinal plane passing through the point CG. Such arrangement also enables higher forward speeds to be attained. The forward location of the point CG with respect to axis R maintains longitudinal stability by providing a restoring moment when the aircraft pitches upwardly under external influence.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3586453A GB755629A (en) | 1953-12-24 | 1953-12-24 | Improvements relating to single-rotor helicopters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3586453A GB755629A (en) | 1953-12-24 | 1953-12-24 | Improvements relating to single-rotor helicopters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB755629A true GB755629A (en) | 1956-08-22 |
Family
ID=10382392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3586453A Expired GB755629A (en) | 1953-12-24 | 1953-12-24 | Improvements relating to single-rotor helicopters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB755629A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3241791A (en) * | 1964-04-03 | 1966-03-22 | Frank N Piasecki | Compound helicopter with shrouded tail propeller |
| US3411737A (en) * | 1966-08-24 | 1968-11-19 | Aubrey W Price | Helicopter |
| US4720059A (en) * | 1986-12-31 | 1988-01-19 | Stearns Jr Hoyt A | High speed helicopter |
-
1953
- 1953-12-24 GB GB3586453A patent/GB755629A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3241791A (en) * | 1964-04-03 | 1966-03-22 | Frank N Piasecki | Compound helicopter with shrouded tail propeller |
| US3411737A (en) * | 1966-08-24 | 1968-11-19 | Aubrey W Price | Helicopter |
| US4720059A (en) * | 1986-12-31 | 1988-01-19 | Stearns Jr Hoyt A | High speed helicopter |
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