IN the September, 1956, issue of AIRCRAFT ENGINEERING, Mr McClements and Sq./Ldr. Armitagc surveyed ‘Helicopter Developments during the Post‐War Years’. The purpose of the present article is to discuss the subsequent developments which have taken place during the last six years. This period has been one of continued expansion in helicopter development and of much more widespread utilization of helicopters in both military and commercial operation. Since their initial development, over 150 different types of helicopter have been successfully flown. This figure includes many experimental machines or prototypes built by small groups. The major helicopter constructors have put about 40 types into quantity production and over 10,000 helicopters have been built in the Western countries. These have been predominantly for the military services, the large majority being built in U.S.A., but something approaching 2,000 have been used in commercial operations.
Stewart, W. (1962), "Recent British technical progress in aeronautics part One—Helicopter Developments A Review of the Technical Progress and Changes in Operating Techniques Which Have Taken Place Principally during the Last Six Years", Aircraft Engineering and Aerospace Technology, Vol. 34 No. 9, pp. 252-275. https://doi.org/10.1108/eb033605Download as .RIS
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