RESUMO

This paper presents the results of an experimental study on the effect of the spacing between the pusher propeller and the wing located in front of it on the environmental noise produced by a light aircraft. It is shown that increasing the axial spacing by 0.1 m yields a 4.6 dBA reduction in the environmental noise by reducing the intensity of the radiation at the harmonics of the blade passing frequency. If the axial spacing exceeds the wing chord (pylon, fin), the effect of the propeller placement in the pusher arrangement disappears and the propeller noise in the given configuration becomes comparable with the noise of an isolated propeller.