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Steinhilper says keep working on it constantly
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Only issue is that is not what the man says.....
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Ulrich Steinhilper, in his auto-biography (chapter 16) , talks about managing the prop-pitch on the early (E3 and E4 variant) 109s during the Battle of Britain. He states that, in order to achieve max climb rate and airspeed (particularly at higher altitudes) one had to constantly increase and decrease the propeller pitch. Increasing the pitch would engage the supercharger, which would be run for a short period (i.e. a second or less?) to force more air into the cylinders, then the pitch would be dropped back down again to disengage the supercharger and convert the power gained into airspeed, and allowing the engine/ supercharger to rest.
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He does not say a thing about changing rpm. He says to constantly manage the pitch.
That is what you have to do in order to maintain rpm!!!
The pitch must be constantly adjusted to maintain rpm as the speed increases!