US2010014977A1PendingUtilityA1

Variable pitch aft propeller vane system

14
Individually held — no corporate assignee on recordPriority: Jul 15, 2008Filed: Jul 13, 2009Published: Jan 21, 2010
Est. expiryJul 15, 2028(~2 yrs left)· nominal 20-yr term from priority
Inventors:Colman D. Shattuck
B64C 11/48B64C 11/16B64C 11/00
14
PatentIndex Score
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Claims

Abstract

A propulsion system includes a rotationally fixed variable pitch vane system located axially aft of a propeller system.

Claims

exact text as granted — not AI-modified
1 . A propulsion system comprising:
 a propeller system which rotates about an axis of rotation; and   a rotationally fixed variable pitch vane system located axially aft of said propeller system.   
   
   
       2 . The propulsion system as recited in  claim 1 , wherein said propeller system includes a plurality of propeller blades and said rotationally fixed variable pitch vane system include a plurality of vanes. 
   
   
       3 . The propulsion system as recited in  claim 2 , wherein said plurality of propeller blades is equal to said plurality of vanes. 
   
   
       4 . The propulsion system as recited in  claim 2 , wherein each of said plurality of propeller blades define a diameter generally equal to a diameter of each of said plurality of vanes. 
   
   
       5 . The propulsion system as recited in  claim 1 , further comprising a vane module operable to collectively change a pitch of each of said plurality of vanes. 
   
   
       6 . A flight control method for an aircraft:
 collectively changing a pitch of a rotationally fixed variable pitch vane system located axially aft of a propeller system.   
   
   
       7 . A method as recited in  claim 6 , further comprising:
 changing the pitch of the rotationally fixed variable pitch vane system to recover a swirl component generated by the propeller system.   
   
   
       8 . A method as recited in  claim 6 , further comprising:
 changing the pitch of the rotationally fixed variable pitch vane system to provides maximum propulsive efficiency at a particular operating point.   
   
   
       9 . A method as recited in  claim 8 , further comprising:
 defining the operating point at a cruise flight condition.   
   
   
       10 . A method as recited in  claim 6 , further comprising:
 changing the pitch of the rotationally fixed variable pitch vane system to a flat pitch during a landing condition.

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