OVER THE PAST TWENTY YEARS the speed of helicopters has almost doubled whilst the payload carried per pound of helicopter weight has increased more than four times. Thus the productivity of the helicopter per lb of vehicle has increased eight-fold.
The development and prospects of helicopters
Aircraft Engineering and Aerospace Technology ; 46 , 2 ; 4-10
1974-02-01
7 pages
Article (Journal)
Electronic Resource
English
The development and prospects of helicopters, part 1
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