Rotor hub fairing system for a counter-rotating, coaxial rotor system
First Claim
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1. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
- an upper hub fairing defined about an axis;
a lower hub fairing defined about said axis; and
an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said airfoil-shaped shaft fairing contoured to reduce a total drag of the rotor hub fairing system, said shaft fairing defines a thickness to hub fairing diameter (t/D) greater than 0.35.
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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 reduces the total drag on a dual, counter-rotating, coaxial rotor system. Other aerodynamic structures may be mounted to the shaft fairing, hub fairings and airframe to facilitate flow around the upper and lower hub fairings to reduce flow separation and drag.
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Citations
23 Claims
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1. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
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an upper hub fairing defined about an axis; a lower hub fairing defined about said axis; and an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said airfoil-shaped shaft fairing contoured to reduce a total drag of the rotor hub fairing system, said shaft fairing defines a thickness to hub fairing diameter (t/D) greater than 0.35. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
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an upper hub fairing defined about an axis; a lower hub fairing defined about said axis; an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said airfoil-shaped shaft fairing contoured to reduce a total drag of the rotor hub fairing system; and a vortex generator mounted on at least one of said upper hub fairing and said lower hub fairing.
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10. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
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an upper hub fairing defined about an axis; a lower hub fairing defined about said axis; an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said airfoil-shaped shaft fairing contoured to reduce a total drag of the rotor hub fairing system; and a directed synthetic jet mounted on at least one of said upper hub fairing and said lower hub fairing.
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11. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
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an upper hub fairing defined about an axis; a lower hub fairing defined about said axis; an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said airfoil-shaped shaft fairing contoured to reduce a total drag of the rotor hub fairing system; and a centrifugal pumping system mounted on at least one of said upper hub fairing and said lower hub fairing.
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12. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
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an upper hub fairing defined about an axis; a lower hub fairing defined about said axis; an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said airfoil-shaped shaft fairing contoured to reduce a total drag of the rotor hub fairing system; and a drive system which operates to independently move said shaft fairing in response to a control system. - View Dependent Claims (14)
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13. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
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an upper hub fairing defined about an axis; a lower hub fairing defined about said axis; and an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said shaft fairing defining a thickness to hub fairing diameter (t/D) greater than 0.35.
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15. A coaxial rotor system aircraft comprising:
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an airframe having a rotor system pylon; an upper hub fairing defined about an axis; a lower hub fairing defined about said axis, said lower hub fairing adjacent said pylon; and an airfoil-shaped shaft fairing between said upper hub fairing and said lower hub fairing, said airfoil-shaped shaft fairing contoured to reduce a total drag of the rotor hub fairing system. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23)
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Specification