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특허 상세정보

Anhedral tip blades for tiltrotor aircraft

국가/구분 United States(US) Patent 등록
국제특허분류(IPC7판) B64C-015/12   
미국특허분류(USC) 244/0124; 244/0070R
출원번호 US-0903928 (2010-10-13)
등록번호 US8066219 (2011-11-16)
발명자 / 주소
출원인 / 주소
대리인 / 주소
    Fish & Associates, PC
인용정보 피인용 횟수 : 4  인용 특허 : 29

A tiltrotor aircraft having a fixed wing and tilting rotors has a rotor blade with a shaped tip portion that provides improved hover performance. The shaped tip portion preferably has a terminal anhedral of at least 20° with respect to its stacking line, and the blade has an overall twist from root to tip of at least 20°, and a thickness ratio between 19% and 30% at a radial station of 10%. These features advantageously conspire to provide a hover figure of merit of at least 0.84 and a cruise propulsive efficiency of at least 0.85. A controller preferabl...


What is claimed is: 1. A rotorcraft comprising:a fixed wing of sufficient size to allow wing-borne flight;the wing carrying a first rotor on a first side of the rotorcraft and a second rotor on an opposite side of the aircraft;the rotors configured to tilt from a predominately horizontal position to a predominantly vertical position; andthe first rotor with a first blade having a stacking line, with the first blade having a shaped tip portion with a terminal anhedral of at least 33° and a terminal sweep of at least 20° with respect to the stacking line, ...

이 특허에 인용된 특허 (29)

  1. Hardoin,Pierre. Aircraft. USP2006037011274.
  2. Dornier ; Jr. ; deceased Claudius (Viehrutenweg 3 late of Hochstadt DEX) Dornier-Tiefenthaler ; legal representative by Martine (Viehrutenweg 3 D-8031 Hochstadt DEX) Windischbauer Florian (Buerlinsha. Aircraft with engine pods tiltable about a transverse axis. USP1992035096140.
  3. Wolkovitch Julian (28603 Trailriders Dr. Rancho Palos Verdes CA 90274). Airplane with braced wings and pivoting propulsion devices. USP1991095046684.
  4. Dupont John J.. Automatic flat rate setting system for freight feeder aircraft and method of setting of engine flat rate. USP2001106311106.
  5. Toulmay Fran.cedilla.ois Valentin Gaston,FRX. Blade for rotary wing aircraft. USP2000116142738.
  6. Splettstoesser Wolf R.,DEX ; Van De Wall Berend,DEX ; Delrieux Yves,FRX ; Gardarein Patrick,FRX. Blade with reduced sound signature, for aircraft rotating aerofoil, and rotating aerofoil comprising such a blade. USP2000096116857.
  7. Balayn Frederic,FRX ; Magre Eric,FRX. Convertible aircraft with tilting rotors. USP2001076260793.
  8. Krysinski, Tomasz; Ferrer, Rogelio; Manfredotti, Thomas; Magre, Eric; Klein, Jean-Marc. Convertible aircraft with tilting rotors. USP2003086607161.
  9. Flanigan,Kenneth Warren. Gas-powered tip-jet-driven tilt-rotor compound VTOL aircraft. USP2006127147182.
  10. Fradenburgh Evan A. (Fairfield CT) Jepson William D. (Huntington CT) Moffitt Robert C. (Seymour CT). Helicopter blade with a tip having a selected combination of sweep, taper and anhedral to improve hover efficiency. USP1982044324530.
  11. Moffitt Robert C. (Seymour CT). Helicopter blade with a tip having a selected combination of sweep, taper and anhedral to improve hover efficiency. USP1982064334828.
  12. Perry Frederick J. (Yeovil GB2). Helicopter rotor blade. USP1987054668169.
  13. Reinfelder, William C.; Purse, Jeffry C.. Helicopter rotor blade having a replaceable anhedral tip. USP1994065320494.
  14. Perry Frederick J. (Yeovil GB2). Helicopter rotor blades. USP1990124975022.
  15. Perry Frederick J. (Yeovil GB2) Brocklehurst Alan (Sherborne GB2). Helicopter rotor blades. USP1993045199851.
  16. Pham, Roger N. High performance VTOL convertiplanes. USP2005126974105.
  17. Ryan Michael J. ; Zimmerman Brett R.. Low-height tunable tilt rotor downstop. USP2001126328256.
  18. Murphy Guy C. (Fairfield OH) Gordon Bruce J. (N. Reading MA) Smith ; Jr. Leroy H. (Cincinnati OH) Schilling Jan C. (Middletown OH) Stuart Alan R. (Cincinnati OH). Noise reduction in aircraft propellers. USP1993035190441.
  19. Karem, Abraham E.. Optimum speed tilt rotor. USP2003116641365.
  20. Perry Frederick John,GBX ; Brocklehurst Alan,GBX ; Harrison Robert John,GBX. Propeller. USP1999075927948.
  21. Tilbor Neil (Six Taunton Rd. Medford NJ 08055) Drees Herman M. (4056 Angela St. Simi Valley CA 93063) Watson William D. (1630 E. Wilton St. Simi Valley CA 93065) Sink Charles J. (1552 Patricia Ave. S. Rotary aircraft passively stable in hover. USP1994035297759.
  22. Faller Alexander (Ergoldsbach DEX). Rotary wing aircraft. USP1992095149014.
  23. Yamakawa Eiichi,JPX ; Murashige Atsushi,JPX ; Tsujiuchi Tomoka,JPX. Rotor blade for rotorcraft. USP2001026190132.
  24. Moffitt, Robert C.; Egolf, Thomas Alan; Beatty, Robert D.; Karpowich, John K.; Bagai, Ashish. Rotor blade tip planform. USP2009047513750.
  25. Bussom, Richard; McVeigh, Michael A.; Narducci, Robert P.; Zientek, Thomas A.. System and method for improved rotor tip performance. USP2010077757992.
  26. Bussom,Richard; McVeigh,Michael A.; Narducci,Robert P.; Zientek,Thomas A.. System and method for improved rotor tip performance. USP2007097264200.
  27. Falchero,Danl��le; Arnaud,Gilles; Beroul,Fr��d��ric; Bailly,Jo��lle; Beaumier,Philippe; Delrieux,Yves. Two-sweep rotary wing blade with limited taper ratio. USP2008027331765.
  28. Roger N. C. Pham. VTOL airplane with only one tiltable prop-rotor. USP2002056382556.
  29. Sambell Kenneth W. (2625 E. Kenwood St. Mesa AZ 85203). Wide-range blade pitch control for a folding rotor. USP1992025085315.