Patent ID: 6592071
Filing Date: 2003-07-15
Classification: G05D

Abstract:
A flight control system for a hybrid aircraft comprising:a movable first control surface operable to direct an aircraft about a pitch axis, said first control surface not on a rotor system; a movable second control surface operable to direct the aircraft about said pitch axis, said second control surface on a rotor system which rotates throughout a hover flight mode, a transition up flight mode, a forward flight mode and a transition down flight mode; a storage device having a blending algorithm and a lift control algorithm, said blending algorithm determining a first gain for said first control surface according to a first gain schedule, and determining a second gain for said second control surface according to a second gain schedule in response to a control input for said pitch axis; and a controller in communication with said first control surface, said second control surface, and said storage device, said controller operable to receive a control command for said pitch axis and actuate said first control surface according to said first gain and said second control surface according to said second gain, said lift control algorithm selectively operable to generate said control command during transition between a hover flight mode and a forward flight mode.