Quote:
Originally Posted by Armatian
Superchargers have lower rpm peak performance unlike turbos, they start to loss capacity
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Bingo. However, where your superchargers peak rpm is depends on how you gear it and how much air it is designed to feed at any given supercharger rpm.
I could expand on that for a few pages but you got the essence of it, "capacity" is the key word. A supercharger tuned/geared to give the engine max boost at 2600rpm will be unable to provide air to uphold that pressure at 3000rpm. Think of the engine as a pump. The higher the rpms, the more air it "pumps" through, and the supercharger can only keep up with it up to a certain point.
As for the British planes, they show prop rpm. Not sure about ze Germans.