Raoul Hafner came to this country in 1932 and continued his earlier helicopter experiments with the successful design and construction in 1937 of the Hafner AR. Ill Gyroplane. He is now Chief Designer of the Helicopter Department of the Bristol Aeroplane Company.

This paper was read in the first instance on 6th March, 1945 before The Bristol Branch of The Royal Aeronautical Society, and subsequently to a joint meeting of The Society of Licenced Aircraft Engineers and The Helicopter Association on the 27th April, 1946.