Patent ID: 7546975
Filing Date: 2009-06-16
Classification: B64C

Abstract:
1. A rotor rotational position-adjusting system for a vertical takeoff and landing aircraft comprising: a first detector that generates rotor signals when a blade of a first rotor of the aircraft passes through a first rotational position; a second detector that generates rotor signals when a blade of a second rotor of the aircraft passes through a second rotational position; and a controller coupled to said first and second detectors to receive said rotor signals, wherein said controller is programmed to determine the relative rotational position of said first and second rotors as a function of said rotor signals, compare said relative rotational position of said first and second rotors with a specified angular tolerance, and adjust a rotational speed of said first rotor in relation to said second rotor in response to said comparison showing that said relative rotational position of said first and second rotors is outside said specified angular tolerance.