A propeller governor is required to control the blade pitch of hydraulic constant speed propellers. Once set, the governor automatically and continuously changes the propeller blade pitch to maintain a constant engine speed (RPM).
A standard propeller requires oil pressure to increase pitch, whereas a counter-weighted aerobatic propeller requires oil pressure to decrease pitch (increases RPM).
Whir Wind Aviation is an authorized reseller of Jihostroj brand governors, the "original Czech governor." For detailed information on the operation and theory of the governor, please visit Jihostroj's web site at: