Canard control system for aircraft
First Claim
1. A flight control system for an aircraft having a canard and a main wing with wing flaps, said system comprising,a canard positionable toward and away from the aircraft center of gravity,canard carrier means within the forward portion of the fuselage and adapted for generally fore and aft movement with at least a portion of said movement being along a path inclined to the aircraft longitudinal axis for increasing the canard angle of attack,flap and canard control means coupled to the main wing flaps and to said canard carrier whereby said carrier and the canard carried thereby are advanced away from the aircraft center of gravity when said flaps are deployed to alter the canard moment arm and to thereby maintain canard and main wing lift forces substantially in equilibrium relative the aircraft center of gravity, andcanard trim means coupled to said canard for varying canard lift independently and without movement of said canard carrier means.
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Accused Products
Abstract
A system with a canard disposed in a cage with canard fore and aft movement within the cage for trimming purposes. Rails support the cage and include both horizontal and inclined segments with the cage and canard inclined by the latter segments to increase the canard angle of attack to preserve the canard-stallfirst characteristic of the aircraft. A combined canard and flap control assures automatic advancement and inclining of the canard to counteract forward pitching of the aircraft caused by flap deployment.
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Citations
11 Claims
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1. A flight control system for an aircraft having a canard and a main wing with wing flaps, said system comprising,
a canard positionable toward and away from the aircraft center of gravity, canard carrier means within the forward portion of the fuselage and adapted for generally fore and aft movement with at least a portion of said movement being along a path inclined to the aircraft longitudinal axis for increasing the canard angle of attack, flap and canard control means coupled to the main wing flaps and to said canard carrier whereby said carrier and the canard carried thereby are advanced away from the aircraft center of gravity when said flaps are deployed to alter the canard moment arm and to thereby maintain canard and main wing lift forces substantially in equilibrium relative the aircraft center of gravity, and canard trim means coupled to said canard for varying canard lift independently and without movement of said canard carrier means.
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7. A flight control system for an aircraft having a main wing and wing flaps, said system comprising,
a canard, canard carrier means mounted in the aircraft fuselage, said carrier means including a cage within which said canard is movably mounted and rail means transversed by said cage, said rail means having an inclined segment and a substantially horizontal segment whereby said canard may be located respectively to the aircraft longitudinal axis to vary canard angle of attack and along said axis to vary the canard moment arm, flap and canard control means coupled to said flaps and said cage for positioning same along said rails, and trim means coupled to said canard to position same within said cage.
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8. In combination,
a canard disposed transversely of the forward portion of an aircraft fuselage and having a central portion within said fuselage, a cage also disposed within the forward portion of the aircraft fuselage and positionable fore and aft, said cage defining an open area to receive said central portion of the canard, means movably mounting said canard in said cage for fore and aft travel of the canard, canard control means coupled to said cage to position the cage fore and aft, and canard trim means including a control in the aircraft cockpit and coupled to said central portion of the canard to position same toward and away from the aircraft center of gravity for trimming of the aircraft.
Specification