I have a question on the differences between constant speed props and variable air screws+automatic prop governer. From what I understand, the former was installed on most planes, and the latter were typical of Luftwaffe fighters..
As I was playing IL-2/FB ver1.1b, I noticed the change in prop/RPM features which implemented a noticeable difference between the two types.
With the constant speed props, in most occasions the prop can be set to 100%(meaning maximum fine), and the plane would be provided with maximum speed. But when the throttle is pulled back, the engine still tries to maintain the set RPM to a considerable extent - as a result, the plane decellerates pretty much slowly, and only when airspeed is pretty low, the RPM slowly falls behind(which I imagine, is due to the fact that the set RPM absolutely cannot be retained any longer at such speeds)
However, in the German planes such as the Bf109 or the Fw190, the throttle changes the set RPM also, and the result is a very responsive throttle system which, when the throttle is lowered, the plane decellerates very quick, and when the throttle is pushed forward, also accelerates very quickly - sometimes, often enough to blow the engine if for any reason the automatic governers are turned off, and the prop pitch is set to 100%.
Thus, in the game, the differences in two planes each give them a distinct 'double edge':
* the former, easy control and maintenance of engine RPM and continuous speed, but needs very quick adjustment of RPM when dangers of overshoot is near(since it can't decellerate fast enough unless prop pitch/RPM is lowered manually, quickly)
* the latter, speed control is very precise and responsive. But the system is more complex. Sometimes the automatic governers aren't always most efficient(for instance, drastic low-speed, prop-hanging appex of zoom climbs), and the consequences of meddling with throttle are also more dire - which usually means if for any reason the throttle is touched mistakenly, your plane will instantly begin feeling its effects.
..
In AH, usually when the throttle is pulled back, the set RPM on the constant speed props is also almost instantly pulled back.
If(just for sake of discussion

) that the depiction in IL-2/FB is closer to how it was, it would seem then the throttle/engine control of AH planes have the better aspects of each of the two differing RPM/prop management styles - stable and easy to manage as a normal constant speed prop, but RPM responding to throttle as quickly as the LW systems.
So historically, how is it different? Did those two systems work like it was depicted in FB?
I'm not implying how AH should be changed or anything - I'm just curious.