Abstract An aircraft has a fuselage from which wings and horizontal stabilizers extend. At low speeds the lifting forces exerted by the airstream passing over the wings create a moment about the center of gravity for the aircraft, and that moment is offset by an opposite or trim force exerted on the horizontal stabilizers. At higher speeds the resultant of the lifting forces on the wings shifts rearwardly and thereby increases the moment about the center of gravity. At such speeds auxiliary airfoils extend from the fuselage to counteract the increased moment so that the trim force on the horizontal stabilizers does not become excessive. The auxiliary airfoils accordingly eliminate excessive static stability and the high drag and structural stresses associated with it.
Inventors
👤 John F Mello
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 19:24
CPC Classifications
B; B64; B64C; B64C5/00; B64C5/10; B64C5/12
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
290 words
An aircraft comprising a fuselage, wings mounted on and projecting from the fuselage for supplying lift to the aircraft, the wings being pivotally mounted on the fuselage for swinging movement between a forwardly disposed position wherein the included angle between the wings and the fuselage is relatively large and rearwardly disposed aft sweep positions wherein the included angle between the wings and the fuselage is smaller; the resultant of the lifting forces exerted by the wings being to the rear of the center of gravity for the aircraft irrespective of the position of the wings and being located further rearwardly in the aft sweep position than in the forward position, whereby the lift forces on the wings create a nose-down moment about the center of gravity; horizontal stabilizers projecting laterally with respect to the fuselage forwardly of the wings and center of gravity and being spaced longitudinally from the wings, the horizontal stabilizers being positioned and configured to produce a moment about the center of gravity which is in opposition to the nose-down moment created by the wings; and auxiliary airfoils mounted on the fuselage behind the wings and being spaced longitudinally from the wings and the horizontal stabilizers, the auxiliary airfoils being positioned and configured to produce a moment about the center of gravity which opposes the nose-down moment exerted by the wings and supplements the moment exerted by horizontal stabilizers, the auxiliary airfoils being retractable so that the moment produced thereby can be varied; whereby as the wings move rearwardly from their forward position to aft sweep positions the auxiliary airfoils may be extended to counteract the increase in the nose-down moment exerted by the wings so that the load on the horizontal stabilizers does not become excessive.
Claim 2
Dependent Claim
290 words
An aircraft comprising a fuselage, wings mounted on and projecting from the fuselage for supplying lift to the aircraft, the wings being pivotally mounted on the fuselage for swinging movement between a forwardly disposed position wherein the included angle between the wings and the fuselage is relatively large and rearwardly disposed aft sweep positions wherein the included angle between the wings and the fuselage is smaller; the resultant of the lifting forces exerted by the wings being to the rear of the center of gravity for the aircraft irrespective of the position of the wings and being located further rearwardly in the aft sweep position than in the forward position, whereby the lift forces on the wings create a nose-down moment about the center of gravity; horizontal stabilizers projecting laterally with respect to the fuselage forwardly of the wings and center of gravity and being spaced longitudinally from the wings, the horizontal stabilizers being positioned and configured to produce a moment about the center of gravity which is in opposition to the nose-down moment created by the wings; and auxiliary airfoils mounted on the fuselage behind the wings and being spaced longitudinally from the wings and the horizontal stabilizers, the auxiliary airfoils being positioned and configured to produce a moment about the center of gravity which opposes the nose-down moment exerted by the wings and supplements the moment exerted by horizontal stabilizers, the auxiliary airfoils being retractable so that the moment produced thereby can be varied; whereby as the wings move rearwardly from their forward position to aft sweep positions the auxiliary airfoils may be extended to counteract the increase in the nose-down moment exerted by the wings so that the load on the horizontal stabilizers does not become excessive.
Claim 3
Dependent Claim
46 words
An aircraft according to claim 1, wherein two auxiliary airfoils are provided and each is hinged to the fuselage for movement from a retracted position wherein the airfoils are generally against the fuselage to an extended position wherein the airfoils project generally laterally from the fuselage.
Claim 4
Dependent Claim
40 words
An aircraft according to claim 1, wherein two auxiliary airfoils are provided and each is slidably mounted in the fuselage; and wherein the airfoils are contained substantially within the fuselage when retracted and project laterally from the fuselage when extended.
Claim 5
Dependent Claim
46 words
An aircraft according to claim 1, wherein the movement of the auxiliary airfoil is responsive to the movement of the wings, the auxiliary airfoil being retracted when the wings are in their forward position and being extended when the wings are in their aft sweep position.