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1. WO1997032780 - SHAPE OF A HELICOPTER BLADE

Publication Number WO/1997/032780
Publication Date 12.09.1997
International Application No. PCT/JP1997/000674
International Filing Date 05.03.1997
IPC
B64C 3/14 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
CAEROPLANES; HELICOPTERS
3Wings
10Shape of wings
14Aerofoil profile
B64C 27/467 2006.1
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
CAEROPLANES; HELICOPTERS
27Rotorcraft; Rotors peculiar thereto
32Rotors
46Blades
467Aerodynamic features
CPC
B64C 27/467
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
CAEROPLANES; HELICOPTERS
27Rotorcraft; Rotors peculiar thereto
32Rotors
46Blades
467Aerodynamic features
B64C 3/14
BPERFORMING OPERATIONS; TRANSPORTING
64AIRCRAFT; AVIATION; COSMONAUTICS
CAEROPLANES; HELICOPTERS
3Wings
10Shape of wings
14Aerofoil profile
Y10S 416/02
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
416Fluid reaction surfaces, i.e. impellers
02Formulas of curves
Y10S 416/05
YSECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
10TECHNICAL SUBJECTS COVERED BY FORMER USPC
STECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
416Fluid reaction surfaces, i.e. impellers
05Variable camber or chord length
Applicants
  • ADVANCED TECHNOLOGY INSTITUTE OF COMMUTER-HELICOPTER, LTD. [JP]/[JP] (AllExceptUS)
  • AOKI, Makoto [JP]/[JP] (UsOnly)
  • NISHIMURA, Hiroki [JP]/[JP] (UsOnly)
  • YAMAKAWA, Eiichi [JP]/[JP] (UsOnly)
Inventors
  • AOKI, Makoto
  • NISHIMURA, Hiroki
  • YAMAKAWA, Eiichi
Agents
  • SAIKYO, Keiichiro
Priority Data
8/5212108.03.1996JP
Publication Language Japanese (ja)
Filing Language Japanese (JA)
Designated States
Title
(EN) SHAPE OF A HELICOPTER BLADE
(FR) FORME DE PALE D'HELICOPTERE
Abstract
(EN) The upper surface and lower surface of a rotor blade of a helicopter are defined by the above coordinate system. The shape of the leading edge of the blade is defined by the above leading edge radius and circle center. With these shape definitions, the drag divergence Mach number Mdd and the maximum lift coefficient Clmax can be increased and the noise leved reduced.
(FR) La surface supérieure et la surface inférieure d'une pale de rotor d'un hélicoptère sont définies par le système de coordonnées (1) ci-dessus. La forme du bord avant de la pale est définie par des valeurs de rayon et de centre du cercle du bord avant ci-dessus. Cette définition des formes permet d'augmenter le mach de divergence de traînée Mdd et le coefficient de portance maximum Clmax, tout en diminuant le bruit.
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