If I were to take my title literally, my task would be light, and this paper would end here. For there is not, nor has there been for some six years, a Panel of the Aeronautical Research Committee on Scale Effect. It would be unfair to cast the responsibility for this error on our Secretary, as I could have changed the title when I replied to his letter asking me to read a paper before you. But as it did not seriously misrepresent the facts, and was less cumbersome than any alternative I could think of, I let it stand.

The Panel to whose work I am permitted to draw your attention is the Design Panel of the Aerodynamics Sub–Committee. It has been my privilege to be Chairman of this Panel for the last year or more. It may not be out of place to mention that the justification for its title is that it deals with the part of the Sub–Committee's work which most directly concerns the design of aeroplanes.