초록 ▼

A pair of vanes (26, 28) extend laterally outwardly from the fuselage (10) of a swept wing aircraft immediately forwardly of the wings (12, 14). The preferred vanes (26, 28) have a trapezoidal plan form, an outwardly tapering thickness and an airfoil cross-sectional configuration. The vanes (26, 28)

A pair of vanes (26, 28) extend laterally outwardly from the fuselage (10) of a swept wing aircraft immediately forwardly of the wings (12, 14). The preferred vanes (26, 28) have a trapezoidal plan form, an outwardly tapering thickness and an airfoil cross-sectional configuration. The vanes (26, 28) are substantially aligned with streamlines (46) during level flight. In a maneuver the vanes generate vortices which flow rearwardly over the upper surfaces of the inboard portions of the wings (12, 14), causing the inboard portions of the wings (12, 14) to stall at lower angles of attack than that of the wings (12, 14) alone would otherwise dictate and a raising of the downwash of the wings in the region of the tail. This lifting of the downwash results in the horizontal stabilizers (16, 18) of the tail being effective to create moments in opposition to “pitchup”of the aircraft.

대표청구항 ▼

An aircraft comprising a fuselage, a pair of swept-back wings attached to the fuselage, each having a swept-back leading edge and upper and lower surfaces; a tail section including a pair of horizontal stabilizers connected to the fuselage rearwardly of the wings; and the improvement comprising appa

An aircraft comprising a fuselage, a pair of swept-back wings attached to the fuselage, each having a swept-back leading edge and upper and lower surfaces; a tail section including a pair of horizontal stabilizers connected to the fuselage rearwardly of the wings; and the improvement comprising apparatus for modulating the stall characteristics of the inboard portions of the wings, comprising: at least one pitch control vane means on each side of the fuselage, each said vane means being attached to the fuselage forwardly of the wing on its side of the fuselage, each said vane means projecting generally laterally outwardly from the fuselage, and said vane means being positioned relative to the wings and being shaped such that in response to an increase in the angle of attack of the wings beyond a predetermined angle of attack the vane means will cooperate with the wings to raise the wing downwash field at the tail section in a manner such that the horizontal stabilizers function better to oppose pitchup of the aircraft.