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US 7,083,142 B2Granted
Compact co-axial rotor system for a rotary wing aircraft and a control system thereof
AssigneeSikorsky Aircraft Corporation
InventorMark Winfield Scott
Life of this patent
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Abstract
A dual, counter rotating, coaxial rotor system provides an upper and lower rotor system, with a reduced axial rotor separation distance along a common axis by way of rotor tip position sensing and rotor position controls to avoid tip contact.
Claims11
A method of controlling a coaxial rotor system comprising the steps of:
- (1) locating a first rotor system and a second rotor system along a common axis, the second rotor system spaced an axial distance from the first rotor system;
- and
- (2) independently controlling the first rotor system and the second rotor system with regard to pitch to maintain a minimum rotor blade tip separation between a rotor blade tip of the first rotor system and a rotor blade tip of the second rotor system.
A method of controlling a coaxial rotor system comprising the steps of:
- (1) locating a first rotor system and a second rotor system along a common axis, the second rotor system spaced an axial distance from the first rotor system;
- and
- (2) independently controlling the first rotor system and the second rotor system with regard to pitch to maintain a minimum rotor blade tip separation between a rotor blade tip of the first rotor system and a rotor blade tip of the second rotor system and spacing the first rotor system and the second rotor system along the common axis an axial distance less than 10 percent of a rotor diameter of the first rotor system and the second rotor system.
Dependencies are inferred from the claim text.