The Chairman, in opening the meeting, said that one of the important aspects of aerodynamics was the study of the interaction between two component systems Thus much experimental work was devoted to the investigation of interference effects between, for example, a wing and a body, or one wing and another wing, or a wing with a jet stream issuing from its surface, or the effect of ground proximity

In the rotary wing field, it was necessary to have a knowledge of the aerodynamic interaction between two rotors for the successful design of tandem rotor helicopters With the modern trend for rotorcraft to have fixed wings and become more like aeroplanes, it was necessary now to have an accurate knowledge of the mutual interaction between a wing and a rotor Tonight, this aspect, as well as other aerodynamic aspects of the Fairey Rotodyne, was to be discussed by the lecturer, Mr K T McKenzie