Considerable advantages to be gained from flying very much higher than between altitudes of 1000 and 2000 ft and in using flight paths similar to those of conventional air liners; optimum conditions for helicopter; example helicopter described; cruising at altitude; effects of higher altitude operation.
Possible flight paths for helicopters
Roy Aeronautical Soc -- J
Royal Aeronautical Society -- Journal ; 61 , n 564
1957
4 pages
Aufsatz (Zeitschrift)
Englisch
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