Flight measurements of ground effect on the lift and pitching moment of a large transport aircraft (comet 3b) and comparison with wind tunnel and other data

Abstract

Summary. Ground effect on lift and pitching moment has been measured on a Comet 3B in flight at one particular value of incidence for the whole range of heights where ground effect is significant. The flight results are in reasonably good agreement with wind-tunnel results and semi-empirical prediction data.