The propeller pitch control alters the angle of the propeller blades. It can be used manually, just like the gearbox in a car to maintain the correct engine speed, or controlled automatically by the computer. Decreasing the prop pitch increases the RPM and vice versa. mm 9 gives minimum RPM by setting the prop pitch to its maximum angle. mm 0 gives maximum RPM by setting the prop to its minimum pitch angle. Similarly, mm — increases the pitch and decreases the RPM. mm 0 decreases the pitch and increases the RPM.
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