WIND-TUNNEL INVESTIGATION OF CONTROL-SURFACE CHARACTERISTICS XXII - MEDIUM AND LARGE AERODYNAMIC BALANCES OF TWO NOSE SHAPES AMD A PLAIN OVERHANG USED WITH A 0.20-AIRFOIL-CH0RD FLAP ON AN NACA OOO9 AIRFOIL

摘要

Blunt-nose and elliptical-nose overhangs of 0.35 and 0.50 flap chord and a plain overhang on a flap having a chord of 0.20 airfoil chord have been tested in two-dimensional flew on an NACA 0009 airfoil. The results of the tests are presented as aerodynamic section characteristics for several flap deflections with the gap at the flap nose sealed or unsealed. Tests were made also to determine the effectiveness of a tab of 0.20. flap chord on the plain sealed flap and on a sealed flap having an elliptical overhang of 0.35 flap chord. The pressure difference across the flap seal was also determined for the plain sealed flap.