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A carrier unit for chordwise extending and rotatably positioning an auxiliary airfoil mounted adjacent to the trailing edge of a relatively fixed main airfoil of an airplane. When the auxiliary airfoil is in a fully retracted and stowed position, the actuation and positioning linkage mechanism of th

A carrier unit for chordwise extending and rotatably positioning an auxiliary airfoil mounted adjacent to the trailing edge of a relatively fixed main airfoil of an airplane. When the auxiliary airfoil is in a fully retracted and stowed position, the actuation and positioning linkage mechanism of the carrier unit is completely housed within the combined auxiliary and main airfoil envelope with no external protrusions or fairings. For auxiliary airfoil extension, to increase the overall chord plane by approximately eight percent, a first set of four-bar linkages is utilized comprising: a beam member supported at a forward portion by a pair of approximately parallel links pivoted to wing structure and swingable chordwise in a generally parallel relationship for translatably shifting the auxiliary airfoil which is pivoted to a rearward portion of the beam member. For changing the auxiliary airfoil angle-of-incidence relative to the main airfoil, one or more sets of four-bar linkages are integrated with the first set for a unified rotation programming and extension drive that functions to produce an aerodynamic slot opening when the auxiliary airfoil is extended to takeoff and landing positions whereat it is deflected up to approximately forty degrees relative to the main airfoil reference chord plane. For an aerodynamic braking action during landing roll-out, the geometrical relationship of the sets of four-bar linkages functions to deflect the auxiliary airfoil chord plane greater than forty degrees, to approximately ninety degrees or more relative to the main airfoil reference chord plane.

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A carrier unit for chordwise extending and rotatably positioning an auxiliary airfoil mounted adjacent to the trailing edge of a relatively fixed main airfoil of an airplane, comprising: a pair of structural rib members spaced apart spanwise and extending chordwise within said main airfoil; said car

A carrier unit for chordwise extending and rotatably positioning an auxiliary airfoil mounted adjacent to the trailing edge of a relatively fixed main airfoil of an airplane, comprising: a pair of structural rib members spaced apart spanwise and extending chordwise within said main airfoil; said carrier unit being supportably mounted between said pair of rib members and comprising: three sets of four-bar linkages arranged in a chordwise integrated series relative to said main airfoil; said first set of four-bar linkages being arranged symmetrically about a fore-and-aft support centerline within said carrier unit for producing a chordwise translational movement of said auxiliary airfoil relative to said main airfoil, such that said auxiliary airfoil is extended to provide a substantial aerodynamic slot, for the through flow of air, between the trailing edge of said main airfoil and the leading edge of said auxiliary airfoil; said second set of four-bar linkages being arranged in a fore-and-aft series alignment with said first set of four-bar linkages for producing a rotational movement of said auxiliary airfoil, about a spanwise axis, to change the angle-of-incidence of said auxiliary airfoil relative to said main airfoil; and said third set of four-bar linkages forming a direct interconnection between said first and second sets of four-bar linkages for synchronization of extension actuation in combination with programming control of angle-of-incidence of said auxiliary airfoil relative to said main airfoil, from an undeflected retracted position to an extended position to form an aerodynamic slot and a deflected position whereat said auxiliary airfoil has its chord plane deflection angle increased relative to a chord reference plane of said main airfoil, for takeoff and landing operation of the airplane.