Wind-tunnel Tests of the Static Longitudinal Characteristics at Low Speed of a Swept-wing Airplane with Slotted Flaps, Area-suction Flaps, and Wing Leading-edge Devices

A low-speed wind-tunnel investigation of a high-wing a irplane with an aspect ratio of 6 .75 and 36 0 sweepback of the quarter-chord line was conducted to determine the lift increments obtainable with area-suction flaps.Comparisons were made with the characteristics of the airplane with the slotted flaps normally used .The flaps were tested in conjunction with various combinations of leading -edge devices to increase maximum lift and to maintain longitudinal stability throughout the lift range .