Compare controlable pitch propeller with fixed pitch propeller?

A screw's pitch is the amount it moves forward per turn. An airscrew (propellor) pitch is the same concept.

Reverse pitch propellers allow the propeller blades to rotates to an angle that produced thrust in the opposite direction direction of flight. This allows propeller driven aircraft to stop faster...

A fine pitch setting on a propeller takes a smaller bite of air, or water, allowing more engine rpm (power) at lower speeds. A coarser pitch (higher number pitch angle) takes a larger bite of the...

The same way you would measure ANY angle.

12 is the diameter 14 is the pitch