Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Plural distinct impellers having related control
Reexamination Certificate
2007-06-12
2007-06-12
Kershteyn, Igor (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Plural distinct impellers having related control
C416S128000, C416S13400R, C416S20400A
Reexamination Certificate
active
11141246
ABSTRACT:
A rotor hub fairing system includes an upper hub fairing, a lower hub fairing and a shaft fairing therebetween. The rotor hub fairing system is sized and configured to reduce the overall drag on a dual, counter-rotating, coaxial rotor system. Preferably, the rotor hub fairing is fully integrated. The shaft fairing preferably includes a minimal thickness at the midsection to reduce drag with an increasing thickness adjacent the upper and lower hub fairings to reduce the flow separation on the hub fairing surfaces without overly excessive drag. Other aerodynamic structures, such as a horizontal splitter and/or a plurality of turning vanes may be mounted to the shaft fairing to facilitate flow around the upper and lower hub fairings to reduce flow separation and drag.
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Title: Experimental Investigation of Advanced Hub and Pylon Fairing Configurations to Reduce Helicopter Drag; By: D.M. Martin, R.W. Mort, L.A. Young, P.K. Squires; Dated: Sep. 1993, NASA Technical Memorandum 4540.
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Title: Rotorcraft Hub Shroud; By: LTC Chip Lunn; Brannon Industries; Apr. 11, 2006.
Bertolotti Fabio P.
Egolf T. Alan
McCormick Duane C.
Scott Mark W.
Wake Brian E.
Carlson & Gaskey & Olds
Kershteyn Igor
Sikorsky Aircraft Corporation
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