US2017283049A1PendingUtilityA1

Differential pre-cone rotary wing arrangement and aircraft

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Assignee: SIKORSKY AIRCRAFT CORPPriority: Oct 1, 2014Filed: Aug 7, 2015Published: Oct 5, 2017
Est. expiryOct 1, 2034(~8.1 yrs left)· nominal 20-yr term from priority
Inventors:Steven D. Weiner
B64C 2027/8227F16F 15/02B64C 2027/8209B64C 2027/8272F05D 2270/021B64C 2027/8281B64C 27/54F16D 13/74B64D 39/06B64C 2027/8263B64C 27/32B64C 27/473B64C 13/18B64C 27/48F02C 9/28F16D 13/52B64C 13/503B64C 27/52B64D 39/00B64C 27/80F16H 37/02B64C 27/82B64C 27/008B64D 45/02B64C 27/33F05D 2220/329B64C 27/12B64C 27/78B64C 27/322B64C 19/00B64C 27/51B64C 7/00F16D 13/72B64C 2027/8236B64C 13/50B64C 27/10B64C 13/04B64D 35/06B64C 27/006B64C 2027/004B64C 27/14B64C 27/001B64C 27/57B64C 27/467B64U 10/10B64C 27/08B64C 1/0009G05D 1/0816G05D 1/0858G05D 1/08G05D 1/0204G05D 1/0202G05D 1/0077B64C 27/16Y02T50/10
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Claims

Abstract

A differential pre-cone rotary wing arrangement includes a first rotor assembly having a first set of rotor blades rotatable about an axis, the first set of rotor blades having a first pre-cone angle, and a second rotor assembly having a second set of rotor blades rotatable about the axis, the second set of rotor blades having a second pre-cone angle, the second pre-cone angle is different than the first pre-cone angle.

Claims

exact text as granted — not AI-modified
1 . A rotary wing arrangement comprising:
 a first rotor assembly having a first set of rotor blades rotatable about an axis, the first set of rotor blades having a first pre-cone angle measured between the blades of the first rotor assembly and a plane parallel to a blade tip path plane defined by the blades of the first rotor assembly; and   a second rotor assembly having a second set of rotor blades rotatable about the axis, the second set of rotor blades having a second pre-cone angle measured between the blades of the second rotor assembly and a plane parallel to a blade tip path plane defined by the blades of the second rotor assembly, the second pre-cone angle being different than the first pre-cone angle.   
     
     
         2 . The rotary wing arrangement of  claim 1 , wherein the first set of rotor blades rotate in a direction opposite to that of the second set of rotor blades. 
     
     
         3 . The rotary wing arrangement of  claim 1 , wherein the first rotor assembly is positioned above the second rotor assembly. 
     
     
         4 . The rotary wing arrangement of  claim 1 , wherein the first pre-cone angle is greater than the second pre-cone angle. 
     
     
         5 . The rotary wing arrangement of  claim 1 , wherein the difference in the first pre-cone angle and the second pre-cone angle is in a range of about ½ to 1½ degrees. 
     
     
         6 . The rotary wing arrangement of  claim 1 , wherein the first rotor assembly is positioned nearer to the second rotor assembly than would be possible if the first pre-cone angle and the second pre-cone angle were the same. 
     
     
         7 . The rotary wing arrangement of  claim 1 , wherein a distance between the first rotor assembly and the second rotor assembly is in a range of 2.0 to 2.5 feet. 
     
     
         8 . The rotary wing arrangement of  claim 1 , wherein a distance between the first rotor assembly and the second rotor assembly is in a range of 2.1 to 2.4 feet. 
     
     
         9 . The rotary wing arrangement of  claim 1 , wherein the first set of blades are rigidly attached to the first rotor assembly and the second set of rotor blades are rigidly attached to the second rotor assembly. 
     
     
         10 . The rotary wing arrangement  claim 1 , wherein at least one fairing covers a rotor hub of at least one of the first rotor assembly and the second rotor assembly. 
     
     
         11 . The rotary wing arrangement of  claim 1 , wherein the blade tip path plane defined by the blades of the first rotor assembly is substantially perpendicular to the axis. 
     
     
         12 . The rotary wing arrangement of  claim 1 , wherein the blade tip path plane defined by the blades of the second rotor assembly is substantially perpendicular to the axis. 
     
     
         13 . An aircraft comprising:
 an airframe;   an extending tail; and   differential pre-cone rotary wing arrangement of any of  claims 1 - 12 .

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