Propeller governor


A propeller governor senses the speed of an aircraft engine and changes the propeller blade angle to maintain a selected RPM regardless of the operational conditions of the aircraft.

History

In the history of the development of aircraft it became necessary to improve performance. One of the influential factors was the propeller design in relation to the most efficient blade angle. The first propellers were fixed pitch. If the propeller blade angle was set to give good take off and climb performance, the propeller would be inefficient in cruising flight because the blade would be at too low of an angle of attack. It was apparent that the blade angle needed to be adjustable.
A constant-speed propeller was needed along with a device that would change the propeller blade angles according to varying flight conditions. Using this system of control an aircraft could obtain an acceptable amount of efficiency during all flight conditions. This device was the propeller governor, or propeller control unit.