Wind Tunnel Investigation of Control Surface Characteristics XXIII: A 0.25 Airfoil-Chord Flap with Tab Having a Chord Twice the Flap Chord on an NACA 0009 Airfoil

摘要

An airfoil was tested which had a 25% chord flap and a 50% chord balancing tab so linked that the tab deflected at given rate with respect to the flap. Tests indicated that flap and tab could be linked to give hinge- moment balance with flap deflection and with angle of attack and yet have greater lift effectiveness than a plain flap of similar size with conventional balancing tab having chord 20% of the flap chord linked to give hinge-moment balance with flap deflection only.