ES356058A1 - Rotor construction with elastic interconnection of opposite blades - Google Patents
Rotor construction with elastic interconnection of opposite bladesInfo
- Publication number
- ES356058A1 ES356058A1 ES356058A ES356058A ES356058A1 ES 356058 A1 ES356058 A1 ES 356058A1 ES 356058 A ES356058 A ES 356058A ES 356058 A ES356058 A ES 356058A ES 356058 A1 ES356058 A1 ES 356058A1
- Authority
- ES
- Spain
- Prior art keywords
- bar
- loop
- bars
- twist
- pitch
- 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
- B64C27/32—Rotors
- B64C27/327—Retention means relieving the stress from the arm, e.g. tie-bars
Abstract
A rigid rotor for a rotorcraft having four blades 9 each rigidly connected to a blade shank sleeve 5 rotatably mounted for pitch change in a bearing sleeve 4 formed on the rotor head 3, each pair of diametrically opposed blades being connected by a laminated torsion bar 10, 18 in the form of a stretched loop, the loop of the bar 10 being in a vertical plane, and the loop of the bar 18 in a horizontal plane and passing through the loop of the bar 8. The laminations may be of steel separated by a low friction layer, e.g. of P.T.F.E. The laminations may comprise either a series of loops side by side (as in bar 18) or a series of concentric loops each encircling the previous one. The torsion bars 10, 18 may be tensioned by disc springs 16, 17, the tension when the rotor is stationary, being adjusted by rotating a nut 14 on a screw 12 which slides without rotating because of a key 13. Cyclic pitch # 2 does not twist the bars 10, 18 as both ends are rotated by the angle, Fig. 3 (not shown). However the collective pitch + # 3 twists the bars by 2# 3 as the ends are both rotated by # 3 but in opposite directions. To minimize the maximum twist of the blades, the bars may be given a present twist of # 1 = # 3 at zero pitch angle, resulting in the bar twist being 2 # 1 = # 3 for the collective pitch range from zero to + # 3 . The insulation of 1,190,259 is acknowledged as prior art.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEB0093415 | 1967-07-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
ES356058A1 true ES356058A1 (en) | 1969-12-16 |
Family
ID=6986954
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
ES356058A Expired ES356058A1 (en) | 1967-07-11 | 1968-07-11 | Rotor construction with elastic interconnection of opposite blades |
Country Status (5)
Country | Link |
---|---|
US (1) | US3578877A (en) |
DE (1) | DE1531359B1 (en) |
ES (1) | ES356058A1 (en) |
FR (1) | FR1559400A (en) |
GB (1) | GB1196318A (en) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3893788A (en) * | 1973-02-06 | 1975-07-08 | Bendix Corp | Flexible coupling |
US3879153A (en) * | 1974-01-07 | 1975-04-22 | Gerald L Breuner | Attachment for rotor hub and pairs of blades |
DE2638167C3 (en) * | 1976-08-25 | 1980-09-25 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Rotor for rotary wing aircraft |
DE2638148C3 (en) * | 1976-08-25 | 1980-09-18 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Rotor for a rotary wing aircraft |
DE2656296C3 (en) * | 1976-12-11 | 1980-10-16 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Rotor for a rotary wing aircraft |
DE2722250A1 (en) * | 1977-03-23 | 1978-11-23 | Messerschmitt Boelkow Blohm | ROTOR OF A ROTARY WING AIRPLANE |
DE2753305C3 (en) * | 1977-11-30 | 1980-06-12 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Four-blade rotor, in particular for rotary wing aircraft |
DE2756398C3 (en) * | 1977-12-17 | 1980-07-24 | Messerschmitt-Boelkow-Blohm Gmbh, 8000 Muenchen | Four-blade rotor, in particular for rotary wing aircraft |
DE2801943C2 (en) * | 1978-01-18 | 1981-09-24 | Messerschmitt-Bölkow-Blohm GmbH, 8000 München | Rotor, especially for a rotary wing aircraft |
GB2122708B (en) * | 1982-07-01 | 1985-09-25 | Dunlop Ltd | Improvements in or relating to link means |
US5110260A (en) * | 1990-12-17 | 1992-05-05 | United Technologies Corporation | Articulated helicopter rotor within an improved blade-to-hub connection |
FR2678579B1 (en) * | 1991-07-03 | 1997-03-21 | Aerospatiale | ROTOR HEAD OF GIRAVION, RIGID IN TRAIL AND ARTICULATED IN PIT AND BEATS. |
WO2015183658A1 (en) * | 2014-05-30 | 2015-12-03 | Sikorsky Aircraft Corporation | Structurally efficient pin wrap |
US11021234B1 (en) | 2017-05-25 | 2021-06-01 | Amazon Technologies, Inc. | Variable pitch mechanisms for propeller blades using a compound gearbox |
US10562608B1 (en) * | 2017-05-25 | 2020-02-18 | Amazon Technologies, Inc. | Variable pitch mechanisms for propeller blades using linear actuation |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2137952A (en) * | 1936-06-25 | 1938-11-22 | Walter W Rothenhoefer | Airplane |
US2495434A (en) * | 1946-05-17 | 1950-01-24 | Joy Mfg Co | Variable pitch propeller |
FR1334446A (en) * | 1961-06-28 | 1963-08-09 | Bolkow Entwicklungen Kg | Joint without friction |
GB1045723A (en) * | 1961-11-06 | 1966-10-19 | Bendix Corp | Improvements in or relating to force transmitting members |
US3228481A (en) * | 1964-04-24 | 1966-01-11 | Bendix Corp | Tie bar bushing |
US3249161A (en) * | 1964-12-02 | 1966-05-03 | Karl E Schoenherr | Feathering controllable pitch propeller |
GB1205757A (en) * | 1967-02-07 | 1970-09-16 | Westland Aircraft Ltd | Improvements in or relating to rotor heads for rotary wing aircraft |
US3384185A (en) * | 1967-06-02 | 1968-05-21 | Aerojet General Co | Rotor hubs |
-
1967
- 1967-07-11 DE DE19671531359 patent/DE1531359B1/en active Pending
- 1967-11-08 GB GB50791/67A patent/GB1196318A/en not_active Expired
-
1968
- 1968-03-25 FR FR1559400D patent/FR1559400A/fr not_active Expired
- 1968-06-04 US US735956A patent/US3578877A/en not_active Expired - Lifetime
- 1968-07-11 ES ES356058A patent/ES356058A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US3578877A (en) | 1971-05-18 |
FR1559400A (en) | 1969-03-07 |
DE1531359B1 (en) | 1969-09-11 |
GB1196318A (en) | 1970-06-24 |
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