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The Oil/Counterweight Type
One of the most common type of constant-speed unit is the oil/counterweight type, which consists of an engine driven centrifugal governor with an oil valve and spring loaded counterweight. Oil pressure is supplied to the hydraulically operated piston by a governor driven oil pump which boosts the engine lubricating oil pressure from about 60 PSI to 275 PSI. The desired RPM is selected with the propeller pitch control, which in turn, controls the flow of oil to or from the piston via the governor operated oil valve. Oil pressure then moves the piston in the stationary cylinder to turn the blades
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This Cessna 206 Stationair floatplane is powered by a three-blade McCauley propeller. |
to coarse pitch, assisted to a lesser degree by the aerodynamic turning moment of the propeller blades. The opposing force produced by the counterweights will turn the blades towards fine/flat pitch assisted by the centrifugal turning moment of the blades. The aerodynamic and centrifugal turning moments were covered earlier in ‘Prop Stress’.
