IT1199771B - Pala per rotore principale di elicottero avente una corta fessura vicino alla estremita'di punta - Google Patents

Pala per rotore principale di elicottero avente una corta fessura vicino alla estremita'di punta

Info

Publication number
IT1199771B
IT1199771B IT22698/86A IT2269886A IT1199771B IT 1199771 B IT1199771 B IT 1199771B IT 22698/86 A IT22698/86 A IT 22698/86A IT 2269886 A IT2269886 A IT 2269886A IT 1199771 B IT1199771 B IT 1199771B
Authority
IT
Italy
Prior art keywords
point
short slot
helicopter rotor
slot close
main helicopter
Prior art date
Application number
IT22698/86A
Other languages
English (en)
Other versions
IT8622698A0 (it
Inventor
A Fradenburgh Evan
Original Assignee
United Technologies 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 Technologies Corp filed Critical United Technologies Corp
Publication of IT8622698A0 publication Critical patent/IT8622698A0/it
Application granted granted Critical
Publication of IT1199771B publication Critical patent/IT1199771B/it

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/32—Rotors
    • B64C27/325—Circulation-control rotors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/32—Rotors
    • B64C27/46—Blades
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B64—AIRCRAFT; AVIATION; COSMONAUTICS
    • B64C—AEROPLANES; HELICOPTERS
    • B64C27/00—Rotorcraft; Rotors peculiar thereto
    • B64C27/54—Mechanisms for controlling blade adjustment or movement relative to rotor head, e.g. lag-lead movement
    • B64C27/72—Means acting on blades
    • B64C2027/7205—Means acting on blades on each blade individually, e.g. individual blade control [IBC]
    • B64C2027/7211—Means acting on blades on each blade individually, e.g. individual blade control [IBC] without flaps
    • B64C2027/725—Means acting on blades on each blade individually, e.g. individual blade control [IBC] without flaps using jets controlled by piezoelectric actuators
    • 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
    • Y02T50/30—Wing lift efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Toys (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Details Of Aerials (AREA)
  • Radio Relay Systems (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
IT22698/86A 1985-12-16 1986-12-16 Pala per rotore principale di elicottero avente una corta fessura vicino alla estremita'di punta IT1199771B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/809,460 US4655685A (en) 1985-12-16 1985-12-16 Helicopter main rotor blade having a short span slot near the tip end

Publications (2)

Publication Number Publication Date
IT8622698A0 IT8622698A0 (it) 1986-12-16
IT1199771B true IT1199771B (it) 1988-12-30

Family

ID=25201401

Family Applications (1)

Application Number Title Priority Date Filing Date
IT22698/86A IT1199771B (it) 1985-12-16 1986-12-16 Pala per rotore principale di elicottero avente una corta fessura vicino alla estremita'di punta

Country Status (6)

Country Link
US (1) US4655685A (it)
JP (1) JPS62143798A (it)
DE (1) DE3642422A1 (it)
FR (1) FR2591558B1 (it)
GB (1) GB2184078B (it)
IT (1) IT1199771B (it)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3674369D1 (de) * 1985-11-06 1990-10-25 Dornier Gmbh Fluggeraet, insbesondere drehfluegelfluggeraet in der art eines flugschraubers fuer hoehere fluggeschwindigkeiten.
US5217349A (en) * 1989-08-31 1993-06-08 Technology Integration Incorporated System and method for suppressing noise produced by rotors
US5253979A (en) * 1992-06-01 1993-10-19 United Technologies Corporation Variable diameter rotor having an offset twist
US5299912A (en) * 1992-07-28 1994-04-05 United Technologies Corporation Drive system for changing the diameter of a variable diameter rotor
US5314308A (en) * 1992-12-11 1994-05-24 Dynamic Engineering, Inc. System for controlling higher harmonic vibrations in helicopter rotor blades
GB9317294D0 (en) * 1993-08-19 1993-10-20 Westland Helicopters Circulation control aerofoils
BG100519A (en) * 1996-04-19 1997-11-28 Румен Тодоров Propeller antivortical system
US6476534B1 (en) 2000-08-08 2002-11-05 General Dynamics Advanced Technology Systems, Inc. Permanent magnet phase-control motor
US6932569B2 (en) * 2002-05-17 2005-08-23 Sikorsky Aircraft Corporation Active control of multi-element rotor blade airfoils
DE60321390D1 (de) 2003-01-23 2008-07-10 Bell Helicopter Textron Inc Propellerblatt mit führungskantennut
FR2852577B1 (fr) * 2003-03-19 2006-01-06 Centre Nat Rech Scient Dispositif de controle d'ecoulement d'air autour d'un profile aerodynamique pour aeronef, du type aile d'avion
US6948906B2 (en) * 2003-04-02 2005-09-27 University Of Maryland Rotor blade system with reduced blade-vortex interaction noise
US20060049302A1 (en) * 2004-08-31 2006-03-09 Kennedy Dennis K Apparatus and methods for structurally-integrated conductive conduits for rotor blades
FR2924681B1 (fr) * 2007-12-05 2010-01-01 Onera (Off Nat Aerospatiale) Element aerodynamique allonge deformable en torsion
US9090343B2 (en) * 2011-10-13 2015-07-28 Sikorsky Aircraft Corporation Rotor blade component cooling
US10703468B2 (en) 2015-09-17 2020-07-07 Sikorsky Aircraft Corporation Stress reducing holes
US11014661B2 (en) * 2016-10-24 2021-05-25 Sikorsky Aircraft Corporation Tip jet orifice for aircraft brown out mitigation

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2638990A (en) * 1947-04-01 1953-05-19 Autogiro Co Of America Aircraft sustaining rotor blade with airflow control
GB1073418A (en) * 1964-10-20 1967-06-28 Power Jeis Res And Dev Ltd Helicopter rotor
US3395760A (en) * 1967-08-18 1968-08-06 John A. Hoffman Aerodynamically feathered helicopter rotor
US3547377A (en) * 1968-03-28 1970-12-15 Peter J Frey Counterflow jet flap helicopter
US3525576A (en) * 1969-03-10 1970-08-25 Pierre Rene Leon Bernard Doran Jet flap control
US3588273A (en) * 1969-03-19 1971-06-28 Honeywell Inc Control apparatus
US3816019A (en) * 1972-08-24 1974-06-11 Us Navy Cam type air control valves
US3902821A (en) * 1973-12-07 1975-09-02 Summa Corp Helicopter rotor
US3917435A (en) * 1974-01-11 1975-11-04 Joseph B Wilkerson Cam and nozzle control valve for fluid flow modulation
US3938762A (en) * 1974-05-20 1976-02-17 Textron, Inc. Rotor blade force track sensing system and automatic span tracking system
US3954229A (en) * 1975-01-02 1976-05-04 Textron, Inc. Automatic one-per-rev control system
US4028003A (en) * 1976-04-12 1977-06-07 United Technologies Corporation Torsionally compliant helicopter rotor blade with improved stability and performance characteristics
US4132500A (en) * 1977-05-18 1979-01-02 The United States Of America As Represented By The Secretary Of The Navy Controllable and programmable fluid flow modulation system
US4130377A (en) * 1977-07-13 1978-12-19 United Technologies Corporation Helicopter blade and rotor
US4248572A (en) * 1978-12-11 1981-02-03 United Technologies Corporation Helicopter blade
FR2479132A1 (fr) * 1980-03-25 1981-10-02 Aerospatiale Pale a hautes performances pour rotor d'helicoptere
GB2090214B (en) * 1980-08-13 1984-09-12 Mckrill Nigel Howard Controlling helicopter rotors
DE3210498A1 (de) * 1982-03-23 1983-10-06 Hans Raehmer Grenzschichtbeeinflussung von fluiddynamischen wirkflaechen
US4493612A (en) * 1982-09-30 1985-01-15 United Technologies Corporation Axially slideable plenum for circulation control aircraft
GB2145381B (en) * 1982-12-01 1986-07-02 Rolls Royce Powerplant for a helicopter
US4507050A (en) * 1983-12-09 1985-03-26 United Technologies Corporation Pneumatic valve control for circulation control aircraft
US4534702A (en) * 1983-12-27 1985-08-13 United Technologies Corporation Pneumatic control valve actuator computer control arrangement
US4573871A (en) * 1984-08-29 1986-03-04 The United States Of America As Represented By The Secretary Of The Army X-Wing aircraft circulation control

Also Published As

Publication number Publication date
GB2184078A (en) 1987-06-17
JPS62143798A (ja) 1987-06-27
US4655685A (en) 1987-04-07
IT8622698A0 (it) 1986-12-16
GB2184078B (en) 1989-10-18
DE3642422A1 (de) 1987-06-19
GB8628771D0 (en) 1987-01-07
FR2591558A1 (fr) 1987-06-19
FR2591558B1 (fr) 1992-11-27

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Legal Events

Date Code Title Description
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19941130