Propeller Control Unit (PCU) Operation

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  Constant Speeding Variable Pitch Propeller System Propeller Control Unit (PCU) Operation How the PCU changes propeller pitch and maintains constant engine speeds  The Pilot moves the throttle lever which, as well as changing fuel flow and therefore engine power, selects an RPM for the engine to run at. The PCU maintains the selected speed by adjusting propeller pitch. This eases pilot workload :- Especially during combat as the engine is automatically prevented from over speeding and therefore potential destruction and the pilot can concentrate on defeating the enemy Basic Principal of Operation And during civilian/transport duties giving the same engine safeguards as above allowing the pilot to concentrate on flying the aircraft, and therefore deliver the passengers and/or cargo safely to their destination (You will see later that the throttle is connected to both the Fuel Control Unit and the PCU)  Propeller Hub Engine Mounted Simplified System PROPELLER SYSTEM  –  VARIABLE PITCH CONTROL Start & Idle Cruise Take Off Throttle Positions: - Pilot Input Signal Hydraulic Pressure Supply Hydraulic Return Operation Piston Spinner Connecting Linkage Hydraulic Connections PCU Sliding Collar Engine RPM Signal (Mechanical Drive) Spring Hydraulic Valve Counter Balance Weights  PROPELLER SYSTEM  –  VARIABLE PITCH CONTROL FMU PCU Piston Engine driven propeller
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