EXPERIMENTAL, engineering may be considered as the cornerstone of the aeronautical industry, regardless of the fact that the very nature of the work involved often calls for large expenditures without prospect of immediate return. Unlike engineering, the sales of a new model are not answerable to any known formulæ, making it necessary to consider that all capital invested in an experimental project may be lost, unless sales sufficient to defray all development costs are realized.
Hite, W.A. (1940), "Engineering Experimental Aeroplanes: Designing Prototype Machines for Manufacturing Economy", Aircraft Engineering and Aerospace Technology, Vol. 12 No. 5, pp. 153-156. https://doi.org/10.1108/eb030645
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