It gives me very great pleasure to introduce our lecturer this afternoon, Mr. R. A. C. BRIE. I do feel that an introduction is unnecessary as most of you will either know him personally or most certainly have heard of his doings from time to time.

Mr. BRIE has been one of the foremost exponents of rotary wing flight since 1930 during which time he has never lost an opportunity of spreading the gospel of rotary wing aircraft both by word and deed and has a number of very interesting and successful flights to his credit.

He is a Founder Member of our Association and if I had my way would have been its first Chairman. He is also a Founder Member of the American Helicopter Society and of a peculiar tribe known as the “Twirley Birds,” also of America.

It was my good fortune to work very closely with Mr. BRIE for some years before the war and there is no one better fitted to talk to us on the subject he has chosen.

Ladies and Gentlemen,

As most of you know this is the Fourth and last lecture of our present session, the other three having been given by Gp/Capt. LIPTROT, Mr. C. G. PULLIN and Mr. R. A. C. BRIE, covering an historical survey, design and operation of helicopters, etc., and to-day our lecturer is discussing “Limitations in Helicopter Design.”

It gives me very great pleasure to introduce Dr. BENNETT to you, for I have known him personally for fifteen years or more, during the whole of which time he has been intimately associated with rotary wing and helicopter design.

For some years prior to the war, Dr. BENNETT was with Messrs. G. & J. Weir and the Cierva Autogiro Co.; and during the war was C.T.O. at the Airborne Forces Experimental Establishment and spent two years in the U.S.A. where he latterly was attached to Wright Field as project engineer on helicopter research.