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PISTON ENGINE PROPULSION

PISTON ENGINE PROPULSION. Chapter 10. Propeller Control Unit (PCU). How the PCU changes propeller pitch and maintains constant engine speeds. 2014 Hyundai Engine. 1933 Alvis Engine. Constant Speeding Variable Pitch Propeller System. Basic Principal of Operation.

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PISTON ENGINE PROPULSION

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  1. PISTON ENGINE PROPULSION Chapter 10 Propeller Control Unit (PCU) How the PCU changes propeller pitch and maintains constant engine speeds 2014 Hyundai Engine 1933 Alvis Engine

  2. Constant Speeding Variable Pitch Propeller System Basic Principal of Operation 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. (You will see later that the throttle is connected to both the Fuel Control Unit and the PCU) The PCU maintains the selected speed by adjusting propeller pitch.

  3. Constant Speeding Variable Pitch Propeller System 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 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

  4. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Spinner Sliding Collar Take Off Connecting Linkage Spring Cruise Counter Balance Weights Start & Idle Pilot Input Signal Hydraulic Return Hydraulic Valve Hydraulic Pressure Supply Hydraulic Connections PCU Simplified System Throttle Positions: - Operation Piston Engine RPM Signal (Mechanical Drive)

  5. FCU PCU PROPELLER SYSTEM – VARIABLE PITCH CONTROL Piston Engine driven propeller

  6. PROPELLER SYSTEM – VARIABLE PITCH CONTROL FCU PCU Jet Engine driven propeller – Turbo-Prop

  7. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Pilot Input Signal Throttle Positions Engine Stationary

  8. Engine Mounted Propeller Hub Take Off Cruise Start & Idle Pilot Input Signal PROPELLER SYSTEM – VARIABLE PITCH CONTROL Throttle Positions Start Initiated – Engine Begins to Rotate

  9. Engine Mounted Propeller Hub Take Off Cruise Start & Idle PROPELLER SYSTEM – VARIABLE PITCH CONTROL Throttle Positions Engine At Idle

  10. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle Positions Take Off Selected

  11. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle Positions Engine Accelerates to Take Off Speed

  12. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle Positions Engine Running at Take Off Speed

  13. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Flying straight and level Dive Flying straight and level Look at how the PCU changes propeller pitch and maintains constant engine speeds during Dive commencement And then at Level Out In all these manoeuvres, all the pilot is doing is flying (redirecting) the aircraft, the throttle is not touched.

  14. Engine Mounted Propeller Hub Take Off Cruise Start & Idle PROPELLER SYSTEM – VARIABLE PITCH CONTROL Throttle Positions Throttle (and Engine) at Cruise – Aircraft Starts Dive

  15. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle at Cruise – Throttle Positions RPM Increases

  16. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle at Cruise – Throttle Positions RPM Increases - Prop Goes to Coarser Pitch

  17. Engine Mounted Propeller Hub Take Off Cruise Start & Idle PROPELLER SYSTEM – VARIABLE PITCH CONTROL Throttle at Cruise – Throttle Positions Aircraft in Dive – RPM Restored

  18. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Flying straight and level Dive Flying straight and level Looked at how the PCU changes propeller pitch and maintains constant engine speeds during Dive commencement Now at Level Out In all these manoeuvres, all the pilot is doing is flying (redirecting) the aircraft, the throttle is not touched.

  19. Engine Mounted Propeller Hub Take Off Cruise Start & Idle PROPELLER SYSTEM – VARIABLE PITCH CONTROL Throttle Positions Throttle at Cruise – Aircraft Levels Out

  20. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle Positions Throttle at Cruise – RPM Reduces

  21. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle Positions Throttle at Cruise – Prop Pitch Reduces

  22. PROPELLER SYSTEM – VARIABLE PITCH CONTROL Engine Mounted Propeller Hub Take Off Cruise Start & Idle Throttle Positions Throttle (and Engine) at Cruise – RPM Restored

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