THE reason for using the helicopter in transport is neither its performance nor its own cost, but the nature and design of its operating site. To separate the two, as is sometimes done in discussions of comparative merits of helicopters and aeroplanes, is clearly a futile exercise.
Shapiro, J.S. (1955), "Reflections on the Interrelation of Helicopter and Heliport Design: A Paper read before the Congress held at Rotterdam, July 27—29, 1955, under the auspices of the Stichting Rotterdam Helicopter Syndicaat", Aircraft Engineering and Aerospace Technology, Vol. 27 No. 11, pp. 378-383. https://doi.org/10.1108/eb032625
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