ON aircraft operating in the rarefied atmosphere at high altitude, the idea of supplementing the air consumed by the engine with extra oxygen would seem to be a logical and desirable development, because the power output of a reciprocating engine is a direct function of the oxygen content of the air charge, provided that all the oxygen is burnt in the cylinder. However, the normal and most satisfactory line of development has been to fit the aircraft with engines of increased capacity or supercharge, so that the oxygen content of the air charge is increased simply by increasing the total mass of air consumed by the engine.
Hawthorne, E.P. (1946), "Oxygen Injection as a Means of Increasing Aero‐Engine Performance: An Account of the Experiments Already Made with This System", Aircraft Engineering and Aerospace Technology, Vol. 18 No. 10, pp. 330-335. https://doi.org/10.1108/eb031424
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