Best Selling Books by Thomas A. Harris

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Tests were conducted on a NACA 23012 wing with full-span combinations of fowler and split-type flaps to determine their control characteristics. Data for roll, yaw, and hinge moments were obtained at air speeds of 40 mph and at several angles of attack and flap deflections. Results indicated that a plain sealed aileron with internal balance will provide lateral control for planes equipped with full-span combinations of slotted and split-type flaps.

The results of this investigation show that the condition of no airl flow through the slot at the desired lift coefficient is attainable. The surface discontinuities produced by the slot openings have, however, such a large effect on the drag that such slots show little promise. An appreciable increase is produced in the maximum lift and the speed-range ratio can be as high as for the plain wing.

An investigation has been made in the N.A.C.A. 7- by 10-foot wind tunnel of a large-chord N.A.C.A. 23012 airfoil with several arrangements of a 40-percent-chord slotted flap to determine the section aerodynamic characteristics of the airfoil as affected by slot shape, flap location, and flap deflection. The flap positions for maximum lift, the polars for arrangements considered favorable for take-off and climb, and the complete section aerodynamic characteristics for selected optimum arrangements were determined. A discussion is given of the relative merits of the various arrangements. A comparison is made of slotted flaps of different chords on the N.A.C.A. 23012 airfoil.