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In an aircraft control mechanism, an auxiliary airfoil fixed on spaced support arms, said arms being mounted on guideways and in parallel relation for chordwise movement, and means for moving one arm a greater distance than the other, comprising interconnected differential means constituting integral pairs of rotating members, one member of each pair being of different diameter than the other member and being positively engaged with one support arm, the second members of the pairs of integral circular members being of the same diameter and being coupled for joint rotation by flexible means passing around the peripheries of both.