Spitfire IIa prop pitch

[JG53Frankyboy]

Originally Posted by Blackdog_kt

...................................The auto prop on the 109s is not like that however. The final effects are similar to a CSP but the operating principle is not. Instead of using a governor mechanism, they actually "tied" each throttle position to a certain pitch (or was it RPM?) value and further fine-tuned it by adding instrumentation that measured the amount of load on the engine.

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it was RPM..............
a pilot in a german one lever system had to set a specific "Leistungszustand" -
just read the link you self posted. If the ATA would be fixed to a certain pitch....that would be senseless.