Wind Tunnel Tests at Transonic and Supersonic Speeds to Investigate the Longitudinal Stability of a Model of thenAVRO 720 Aircraft

摘要

Tests have been made in the 3ft x 3ft wind tunnel at RAE Bedford on a 1:30 scale model of the AVRO 720 aircraft to investigate the longitudinal stability characteristics at Mach numbers between 0.70 and 2.00. Additional tests were made with airbrakes attached to the rear-fuselage and with notches cut in the leading edges of the wing at 66.7% semispan.nThe results show no doubtful features apart from a sharp but small transient pitch-up at lift coefficients around CL =0.45 for M = 0.80 and CL = 0.60 for M = 0.96. The instability is appreciably reduced by the application of up-eleven and is almost completely eliminated by the leading edge notches. The notches, however, introduce some instability at M = 0.99 where none had occurred originally.