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Line 86: The [[Hispano-Suiza 12Y-45]] engine was an underpowered, older design, with {{convert|850|CV|hp|abbr=on}} at takeoff at 2,400 rpm, or {{convert|935|CV|hp|abbr=on}} emergency power at 2,520 rpm and at a height of {{convert|1900|m|ft|abbr=on}}.<ref>Danel and Cuny 1966, p. 248.</ref> The Hispano engine had some advantages over some later engines; for example, its weight was only {{convert|515|kg|lb|abbr=on}}, compared to the {{convert|620|kg|lb|abbr=on}} of the [[Rolls-Royce Merlin III]].<!--Clarify: there is some doubt about a fuel injection system similar to the DB 601; according to Danel and Cuny and http://arsenalvg33.free.fr/moteur.htm there were six small Solex carburettors on the inlet manifolds--Another significant aspect was the provision of a fuel injection system, much the same as that on the [[Daimler-Benz DB 601|DB.601]] engine, that allowed the D.520 to dive without [[fuel starvation]] problems. I would go with that as the comment originally was more like a guesswork statement--> Development of the engine had not been straightforward, and had delayed overall production of the aircraft.<ref name = "Denel 5 6"/> According to an aviation author, it was alleged by American aviator [[Charles Lindbergh]] that secret negotiations were conducted between Dewoitine and [[Daimler-Benz]] during 1939 to obtain the DB.601 engine for the D.520, but that these did not come to fruition due to the war.<ref name = "Denel 5"/> Fuel was fed via six [[Solex]] S.V. 56 carburettors mounted on an inlet manifold which directed compressed air from the supercharger to the engine cylinders; the 12Y-45 and -49s fitted to production D.520s used either [[octane rating|92 or 100 octane]] fuel.<ref>Danel and Cuny 1966, pp. 72, 245, 303.</ref> The -45 drove an electrically operated [[Ratier Type 1606M]] three-bladed, {{convert|3|m|ft|abbr=on}} diameter, variable-pitch propeller, while D.520s from By 1940 a version of the 520D was flying with a Rolls Royce Merlin X engine. [[Baron Hives|Ernest Hives]] stated that agreement had been reached with the French Government for the manufacture of the Merlin in France. ("The Merlin in perspective" - A Harvey-Bailey -Rolls Royce Heritage Trust, p130) Line 332: * [[Mikoyan-Gurevich MiG-3]] * [[Mitsubishi A6M Zero]] * [[ * [[SNCAO 200]] * [[Supermarine Spitfire]] | |||