Wind-tunnel experiments on a rectangular-wing jet-flap model of aspect-ratio 6

Abstract

Balance measurements of lift, pitching moment and thrust on an aspect-ratio 6 half-model wing and body in the N.P.L. 13 ft × 9 ft Wind Tunnel are discussed, and compared with theoretical estimates. The experimental investigation concentrated mainly on full-span flap deflections and blowing (with body cut-out), firstly without a tail unit, and then with a tailplane of variable incidence and height added to derive the mean downwash angles at a conventional fore-and-aft location. The effects of slot blockage and of part-span flaps on lift and thrust were also examined briefly.