IT is an accepted principle that primary controls should have full consideration during the initial design of an aircraft but there is a general tendency to ignore secondary controls and systems, such as electrics and hydraulics, until all other requirements have been satisfied, basic shapes and sizes determined and structural members laid out.
Hollyhock, W.S. (1955), "Rationalizing Aircraft Secondary Controls and Systems: A Plea for More Thought in Early Design Stages", Aircraft Engineering and Aerospace Technology, Vol. 27 No. 7, pp. 223-223. https://doi.org/10.1108/eb032576Download as .RIS
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