Quote:
Originally Posted by Graham Boak
For performance at higher altitudes the US went to turbochargers, the UK to two-stage superchargers, the Germans to exotic fuel additives. This was partly a matter of available materials, turbochargers requiring exotic metals the Germans lacked; and available expertise, RR being particularly good with superchargers.
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The Germans were going towards two stage mechanical superchargers as well. There were numerous such projects, the development was just slow. The Jumo 213E was the only such engine to reach the service in some degree.