De-rotation system for a counter-rotating, coaxial rotor hub shaft fairing
First Claim
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1. A fairing system comprising:
- a shaft fairing mounted for rotation about an axis of rotation;
a de-rotation system mounted to said shaft fairing to control a rotation of said shaft fairing about said axis of rotation;
an upper hub fairing defined about said axis; and
a lower hub fairing defined about said axis, said shaft fairing mounted for relative movement between said upper hub fairing and said lower hub fairing.
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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 is attached to the counter-rotating, coaxial rotor system through a bearing arrangement such that the shaft fairing may be positioned at an azimuthal position about the main rotor axis of rotation relative the airframe by a de-rotation system. The de-rotation system controls the position of the shaft fairing about the axis of rotation such that the shaft fairing is prevented from rotating freely in unison with either shaft as may otherwise result during some flight regimes.
56 Citations
7 Claims
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1. A fairing system comprising:
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a shaft fairing mounted for rotation about an axis of rotation; a de-rotation system mounted to said shaft fairing to control a rotation of said shaft fairing about said axis of rotation; an upper hub fairing defined about said axis; and a lower hub fairing defined about said axis, said shaft fairing mounted for relative movement between said upper hub fairing and said lower hub fairing.
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2. A fairing system comprising:
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a shaft fairing mounted for rotation about an axis of rotation; and a de-rotation system mounted to said shaft fairing to control a rotation of said shaft fairing about said axis of rotation, a housing mounted to said shaft fairing; a gear train supported by said housing; an upper belt engaged with said gear train and an upper drive member which rotates about said axis of rotation; and a lower belt engaged with said gear train and a lower drive member which rotates about said axis of rotation in a direction opposite said upper drive member. - View Dependent Claims (3, 4, 5)
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6. A rotor hub fairing system for a counter rotating coaxial rotor system comprising:
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an upper hub fairing defined about a rotor axis of rotation; a lower hub fairing defined about said rotor axis of rotation; a shaft fairing mounted between said upper hub fairing and said lower hub fairing for rotation about said rotor axis of rotation; a passive de-rotation system mounted to said shaft fairing to minimize uncontrolled rotation of said shaft fairing about said axis of rotation. - View Dependent Claims (7)
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Specification