GB1232037A - - Google Patents
Info
- Publication number
- GB1232037A GB1232037A GB1232037DA GB1232037A GB 1232037 A GB1232037 A GB 1232037A GB 1232037D A GB1232037D A GB 1232037DA GB 1232037 A GB1232037 A GB 1232037A
- Authority
- GB
- United Kingdom
- Prior art keywords
- blade
- glass fibre
- shank
- rotor
- sleeve
- 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
- 239000003365 glass fiber Substances 0.000 abstract 3
- 239000006260 foam Substances 0.000 abstract 1
- 239000004033 plastic Substances 0.000 abstract 1
- 229920003023 plastic Polymers 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/32—Rotors
- B64C27/37—Rotors having articulated joints
- B64C27/45—Rotors having articulated joints with a feathering hinge only
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C27/00—Rotorcraft; Rotors peculiar thereto
- B64C27/32—Rotors
- B64C27/46—Blades
- B64C27/473—Constructional features
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Moulding By Coating Moulds (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
1,232,037. Helicopter rotors. MESSERSCHMITT - BOLKOW - BLOHM G.m.b.H. 6 Aug., 1968 [14 Sept., 1967], No. 37503/68. Heading B7W. A helicopter rotor comprises a rigid head 1 provided with rigid arms 3 set at a fixed coning angle α, each arm having rotatably mounted therein, a blade shank sleeve 4 to which is rigidly connected the root fitting 6 of a rotor blade 7 adjusted in pitch by a control horn 5 on sleeve 4 and which comprises a glass fibre shank 8 of such a width:thickness ratio that it possesses substantially the same chordwise and flapping flexural resistance and of such a length a that the blade's natural frequency in the drag direction is below the rotor's rotational frequency, an aerofoil 9 provided with a glass fibre leading edge (23, Fig. 2, not shown) that merges with the shank and an aerodynamically shaping glass fibre shell filled with a supporting plastics foam core and weights 10 mounted either at or adjacent the blade tip.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE1531375A DE1531375C3 (en) | 1967-09-14 | 1967-09-14 | Flapless and pivot-less, but not rigid rotor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1232037A true GB1232037A (en) | 1971-05-19 |
Family
ID=5675485
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1232037D Expired GB1232037A (en) | 1967-09-14 | 1968-08-06 |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3477796A (en) |
| FR (1) | FR1595587A (en) |
| GB (1) | GB1232037A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3782856A (en) * | 1972-05-31 | 1974-01-01 | United Aircraft Corp | Composite aerodynamic blade with twin-beam spar |
| US4083656A (en) * | 1975-03-21 | 1978-04-11 | Textron, Inc. | Composite rotor blade |
| US4302155A (en) * | 1979-01-08 | 1981-11-24 | Hartzell Propeller, Inc. | Air craft propeller assembly with composite blades |
| US4304694A (en) * | 1979-12-03 | 1981-12-08 | United Technologies Corporation | High damping epoxy resin composite |
| US5549455A (en) * | 1992-07-15 | 1996-08-27 | Aerostar Marine Corporation | Through the hub exhaust flow improvements for marine variable pitch propeller |
| US7699260B2 (en) * | 2005-01-14 | 2010-04-20 | Hughey Electricopter Corporation | Vertical takeoff and landing aircraft using a redundant array of independent rotors |
| CN107323651B (en) * | 2015-06-01 | 2020-02-28 | 深圳市大疆创新科技有限公司 | Arm subassembly, frame and unmanned aerial vehicle |
| US10415581B1 (en) * | 2018-04-25 | 2019-09-17 | Brien Aven Seeley | Ultra-quiet propeller system |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2588570A (en) * | 1946-10-31 | 1952-03-11 | Autogiro Co Of America | Blade construction for aircraft sustaining rotors |
| US2484141A (en) * | 1947-01-09 | 1949-10-11 | United Aircraft Corp | Skin stressed laminated fiberglas rotor blade |
| US2659444A (en) * | 1949-06-21 | 1953-11-17 | Autogiro Co Of America | Molded aircraft sustaining rotor blade |
| US3000446A (en) * | 1958-08-25 | 1961-09-19 | Studebaker Packard Corp | Helicopter rotor blades |
| FR1334446A (en) * | 1961-06-28 | 1963-08-09 | Bolkow Entwicklungen Kg | Joint without friction |
| US3237697A (en) * | 1963-02-11 | 1966-03-01 | Boeing Co | Helicopter rotor blade |
| US3321019A (en) * | 1965-10-22 | 1967-05-23 | United Aircraft Corp | Fiberglass blade |
-
1968
- 1968-07-23 US US746871A patent/US3477796A/en not_active Expired - Lifetime
- 1968-08-06 GB GB1232037D patent/GB1232037A/en not_active Expired
- 1968-09-13 FR FR1595587D patent/FR1595587A/fr not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US3477796A (en) | 1969-11-11 |
| FR1595587A (en) | 1970-06-15 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PE20 | Patent expired after termination of 20 years |