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Constant speed governors were the original unit developed to maintain a constant speed on the propeller as the name implies. The single engine aircraft benefited a great deal from the development of the constant speed propeller. The governor uses oil from the engine to hydraulically maintain a set speed setting. The constant speed governing system decreased takeoff roll and improves climb rates and cruise speeds.
McCauley manufactures two different type styles of constant speed governors. The two types are defined as dampened and un-dampened. The basic undampened model is identified by the alphanumeric callout C290D3(X)/T(X). The dampened version is identical to undampened version except for the flyweight assembly. The basic dampened model is identified by the alphanumeric callout DC290(X)/T(X). The dampened version uses a spring loaded flyweight assembly designed to filter out unwanted vibrations that could interfere with the smooth operation of the pilot valve on certain makes and models of engines. Both dampened and undampened constant speed governors feature a retained flyweight assembly which insures smooth, even rotation, free from fluctuations.
Feathering governors were developed to maintain a constant speed on the feathering propeller as the name implies. The basic feathering governor model is identified by the alphanumeric callout of DCF290D(X)/T(X). Twin engine aircraft benefit from the safety of the use of the feathering propeller control system. The feathering governor uses oil from the engine to hydraulically maintain a given speed setting and allows the pilot to feather the propeller in the event of a loss of power or other engine problem. Feathering the propeller eliminates drag that would be caused by a wind-milling, non-feathered propeller. This gives the pilot the ability to fly the aircraft with one engine to the nearest airport for repairs.
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