unten ist schön beschrieben, wann die Drehzahl durch den Low-Pitch-Anschlag (Low Pitch Stop) begrenzt wird (z.B. beim run-up) und wann der Governor "übernimmt". Sowohl der Low-Pitch-Anschlag und max. Drehzahl des Governors müssen richtig (und unabhängig voneinander) eingestelllt sein, damit es nie zu einem Überdrehen (overspeed) des Motors/Propellers kommen kann.
Viele Grüße
Mark
General Facts About McCauley Governors (Quelle)
Static Run-Up - What is Normal?
There has been some confusion in the field concerning propeller low blade angle setting, the governor setting and how it relates to static run-up and take-off RPM. As a general rule, engine redline RPM cannot be reached during a full power static run-up. Contrary to popular belief, the governor is not controlling the propeller at this time, the propeller is against its low pitch stop. Attempting to increase propeller static run-up RPM by adjusting the governor high RPM screw will have no effect and will probably result in a propeller overspeed during the take-off roll. On a single engine aircraft several considerations determine both the low and high blade angle settings. Normally 25 to 100 RPM below rated take-off RPM is desirable and acceptable during a static run-up. McCauley's practice is to set the low blade angle so that rated take-off RPM is not reached until the aircraft has reached some significant groundspeed during roll out. At this time, and only this time, the propeller is controlled by the governor. There are two advantages to this practice. First, the maximum static RPM can be used as a check on developed horsepower as with a fixed pitch propeller. Any loss of maximum power over time is readily apparent during a preflight check. Second, if the propeller remains in a flat pitch after take-off due to some malfunction, the higher angle low pitch setting will permit more thrust to be developed to fly the aircraft without overspeeding the engine.