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Pub. No.:    WO/1999/042360    International Application No.:    PCT/US1999/003627
Publication Date: 26.08.1999 International Filing Date: 19.02.1999
Chapter 2 Demand Filed:    20.09.1999    
B64C 27/04 (2006.01)
Applicants: KAREM, Abraham, E. [US/US]; (US)
Inventors: KAREM, Abraham, E.; (US)
Agent: MARANTIDIS, Constantine; Christie, Parker & Hale, LLP P.O. Box 7068 Pasadena, CA 91109-7068 (US)
Priority Data:
60/075,509 20.02.1998 US
Abstract: front page image
(EN)A variable speed helicopter rotor system and method for operating such a system are provided which allow the helicopter rotor to be operated at an optimal angular velocity in revolutions per minute (RPM). This, in turn, minimizes the power required to turn the rotor and thereby resulting in helicopter performance efficiency improvements, reduction in noise, and improvements in rotor, helicopter transmission, and engine life. The system and method provide for an increase in helicopter endurance and a substantial improvement in helicopter performance during take-off, hover and maneuver.
(FR)L'invention concerne un rotor d'hélicoptère à vitesse variable et un procédé relatif à l'exploitation dudit rotor, permettant de faire fonctionner un hélicoptère à vitesse optimale en tours/minute, et réduisant ainsi au minimum la puissance requise pour la rotation du rotor. Les avantages sont les suivants : amélioration de l'efficacité, réduction du bruit, et améliorations de la durée de vie du rotor, de la transmission de l'hélicoptère et du moteur. Le rotor et le procédé considérés permettent d'augmenter l'autonomie, mais aussi d'améliorer sensiblement les performances au décollage, en vol stationnaire et aux fins de manoeuvre.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW.
African Regional Intellectual Property Organization (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG).
Publication Language: English (EN)
Filing Language: English (EN)