US2017274990A1PendingUtilityA1

Rotor hover figure of merit for rotary wing aircraft

56
Assignee: SIKORSKY AIRCRAFT CORPPriority: Oct 1, 2014Filed: Sep 24, 2015Published: Sep 28, 2017
Est. expiryOct 1, 2034(~8.2 yrs left)· nominal 20-yr term from priority
Inventors:William J. EadieThomas Alan EgolfRobert C. Moffitt
B64C 2027/8227F16F 15/02F05D 2220/329B64D 45/02B64C 13/18F05D 2270/021B64C 27/33B64C 27/32B64C 7/00B64C 27/52B64C 27/473B64C 27/54B64C 2027/8263B64C 27/82B64C 2027/8281B64C 2027/8272B64C 27/80B64C 27/322B64C 27/008B64D 39/06F16D 13/52F16D 13/74F16H 37/02B64C 27/78B64C 27/51B64C 27/48B64C 13/503B64C 19/00F02C 9/28B64C 2027/8209F16D 13/72B64D 39/00B64C 27/12B64C 13/04B64C 2027/8236B64C 13/50B64C 27/467B64C 27/001B64C 2027/004B64C 27/57B64D 35/06B64C 27/14B64C 27/006B64C 27/10B64C 27/08B64C 27/16B64U 10/10B64C 1/0009G05D 1/0816G05D 1/0858G05D 1/08G05D 1/0204G05D 1/0202G05D 1/0077Y02T50/10
56
PatentIndex Score
0
Cited by
0
References
0
Claims

Abstract

An aircraft composed of an airframe, an extending tail, a counter rotating, coaxial main rotor assembly including an upper rotor assembly and a lower rotor assembly, and a translational thrust system positioned at the extending tail. The translational thrust system provides translational thrust to the airframe. The aircraft also includes a rotor hover figure of merit greater than about 0.79 for a C T/σ between about 0.085 and about 0.125.

Claims

exact text as granted — not AI-modified
What is claimed is: 
     
         1 . An aircraft comprising:
 an airframe;   an extending tail;   a counter rotating, coaxial main rotor assembly including an upper rotor assembly and a lower rotor assembly; and   a translational thrust system positioned at the extending tail, the translational thrust system providing translational thrust to the airframe;   wherein the aircraft has a rotor hover figure of merit greater than about 0.79 for a C T /σ between about 0.085 and about 0.125.   
     
     
         2 . The aircraft according to  claim 1 , wherein the rotor hover figure of merit is greater than about 0.80 for a C T /σ between about 0.0925 and about 0.125. 
     
     
         3 . The aircraft according to  claim 1 , wherein the rotor hover figure of merit is greater than about 0.81 for a C T /σ between about 0.1025 and about 0.125. 
     
     
         4 . The aircraft according to  claim 1 , wherein the rotor hover figure of merit is greater than about 0.815 for a C T /σ between about 0.12 and about 0.125. 
     
     
         5 . The aircraft according to  claim 1 , wherein the rotor hover figure of merit is about 0.815 for a C T /σ between about 0.12 and about 0.125. 
     
     
         6 . An aircraft comprising:
 an airframe;   an extending tail;   a counter rotating, coaxial main rotor assembly including an upper rotor assembly and a lower rotor assembly; and   a translational thrust system positioned at the extending tail, the translational thrust system providing translational thrust to the airframe;   wherein the aircraft has a rotor hover figure of merit between about 0.79 and 0.82 for a C T /σ between about 0.085 and about 0.125.   
     
     
         7 . The aircraft according to  claim 6 , wherein the rotor hover figure of merit is between about 0.80 and about 0.82 for a C T /σ between about 0.0925 and about 0.125. 
     
     
         8 . The aircraft according to  claim 6 , wherein the rotor hover figure of merit is between about 0.81 and about 0.82 for a C T /σ between about 0.1025 and about 0.125. 
     
     
         9 . The aircraft according to  claim 6 , wherein the rotor hover figure of merit is between about 0.815 and 0.82 for a C T /σ between about 0.12 and about 0.125.

Join the waitlist — get patent alerts

Track US2017274990A1 — get alerts on status changes and closely related new filings.

We store only your email — no account needed. See our privacy policy.