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GB1391940A - Helicopter rotor blades - Google Patents

Helicopter rotor blades

Info

Publication number
GB1391940A
GB1391940A GB3037972A GB3037972A GB1391940A GB 1391940 A GB1391940 A GB 1391940A GB 3037972 A GB3037972 A GB 3037972A GB 3037972 A GB3037972 A GB 3037972A GB 1391940 A GB1391940 A GB 1391940A
Authority
GB
United Kingdom
Prior art keywords
tip portion
blade
helicopter rotor
chord
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
Application number
GB3037972A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RTX Corp
Original Assignee
United Aircraft Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by United Aircraft Corp filed Critical United Aircraft Corp
Publication of GB1391940A publication Critical patent/GB1391940A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/32—Rotors
    • B64C27/46—Blades
    • B64C27/463—Blade tips
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/32—Rotors
    • B64C27/46—Blades
    • B64C27/467—Aerodynamic features
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/10—Drag reduction

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

1391940 Helicopter rotor blade UNITED AIRCRAFT CORP 29 June 1972 [22 Sept 1971] 30379/72 Heading B7W A helicopter rotor blade has a tip portion 20 having negative twist which changes non- linearly, see Fig. 2, a thickness of between 6 and 10% of chord dimension, and a camber whose maximum occurs forward of the 50% chord station. The tip portion may be of constant chord, or may have trapezoidal portion, Fig. 4, or may have pivotally mounted tabs (50, 54), Fig. 25 (not shown), for changing between the two configurations. Alternatively, Fig. 19, the tip portion may be swept back so that the centre of lift of the tip portion is aft of the blade elastic axis, the centre of gravity being kept on or forward of the axis by balance weight 90 accommodated in a forward swept part of the leading edge. The tip portion 20 may have the aerofoil cross-section specified in patent Specification 1,391,939. This blade is stated to have reduced tip stall, blade-out-of-track instability and noise.
GB3037972A 1971-09-22 1972-06-29 Helicopter rotor blades Expired GB1391940A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18261871A 1971-09-22 1971-09-22

Publications (1)

Publication Number Publication Date
GB1391940A true GB1391940A (en) 1975-04-23

Family

ID=22669265

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3037972A Expired GB1391940A (en) 1971-09-22 1972-06-29 Helicopter rotor blades

Country Status (6)

Country Link
JP (1) JPS4872899A (en)
DE (1) DE2238250A1 (en)
FR (1) FR2153253A1 (en)
GB (1) GB1391940A (en)
IT (1) IT967761B (en)
MY (1) MY7800256A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2312712A (en) * 1996-04-30 1997-11-05 Gkn Westland Helicopters Ltd Propeller/rotor blade

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1538055A (en) * 1975-05-19 1979-01-10 Westland Aircraft Ltd Helicopter rotor blades
US4028003A (en) * 1976-04-12 1977-06-07 United Technologies Corporation Torsionally compliant helicopter rotor blade with improved stability and performance characteristics
US4142837A (en) * 1977-11-11 1979-03-06 United Technologies Corporation Helicopter blade
FR2463054A1 (en) * 1979-08-10 1981-02-20 Aerospatiale BLADE PROFILE FOR AN AIRCRAFT TURNING SAIL
CA1141738A (en) * 1979-08-10 1983-02-22 Jacques Gallot Rotary wing rotor blade profile
US4314795A (en) * 1979-09-28 1982-02-09 The Boeing Company Advanced airfoils for helicopter rotor application
FR2479132A1 (en) * 1980-03-25 1981-10-02 Aerospatiale HIGH PERFORMANCE BLADE FOR HELICOPTER ROTOR
GB9022281D0 (en) * 1990-10-13 1991-02-20 Westland Helicopters Helicopter rotor blades
DE19528155C1 (en) * 1995-08-02 1996-06-27 Deutsche Forsch Luft Raumfahrt Helicopter rotor blade of glass fibre reinforced synthetic resin
JPH09254893A (en) * 1996-03-25 1997-09-30 Commuter Herikoputa Senshin Gijutsu Kenkyusho:Kk Rotor blade and rotor system for helicopter
JP3916723B2 (en) * 1997-05-15 2007-05-23 富士重工業株式会社 Rotor blade of rotorcraft
FR2793766B1 (en) * 1999-05-21 2001-07-13 Eurocopter France AIRCRAFT TURNING BLADE

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2312712A (en) * 1996-04-30 1997-11-05 Gkn Westland Helicopters Ltd Propeller/rotor blade

Also Published As

Publication number Publication date
FR2153253A1 (en) 1973-05-04
IT967761B (en) 1974-03-11
DE2238250A1 (en) 1973-03-29
JPS4872899A (en) 1973-10-01
MY7800256A (en) 1978-12-31

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee