TLS, one page, 8.5 x 11, Sikorski Aircraft letterhead, January 11, 1957. In part: “I do not expect very radical further development in the helicopter except for the appearance of the so-called compound helicopter which permits obtaining speeds in excess of 200 mph. It may be stated with certainty that the helicopter can safely be enlarged considerably above the present size…My decision to develop helicopters was prompted by the recognition of the immense value of a vehicle of transportation that would be completely free of the need of roads, bridges, etc., as well as airports with long runways.” In fine condition. A great letter with amazing aviation content. RRAuction COA.
