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Double acting feathering system:
To prevent excessive drag in the event of a propeller on engine failure, the double acting propeller as with the single acting propeller requires a feathering system.
DESCRIPTION
The system has mechanical and electro hydraulic means of lifting the PCU control valve. An electrically driven pump supplies the feathering oil pressure. Oil is supplied from a 'Feathering' Reserve in the main engine oil tank.
OPERATION
The control valve is lifted by moving the HP fuel cock lever to 'Feather' or by the piston lift solenoid valve opening and hydraulic pressure acts on the valve lift piston.Oil pressure from the feathering pump is directed to the coarse pitch line to feather the blades. When the feathering is complete a pressure operated switch de-energises the pump-solenoid to stop the pump.To unfeather the HP lever is opened and the feathering pump switched on for a few seconds.
MANUAL FEATHERING
HP fuel cock lever moved to 'feather'. Feathering pump started by Manual Feather Switch. Some systems have the feathering pump switch incorporated in the Engine Fire Handle.
AUTOMATIC FEATHERING
This uses the torque indicating system to sense engine failure.
When torque drops to a certain valve a low torque pressure switch completes a circuit to operate the piston lift solenoid and start the feathering pump.
Engine speed indicators: All engines have their rotational speed (R.P.M.) indicated. On a twin or triple-spool engine, the high pressure assembly speed is always indicated; in
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Types of patterns : These depends upon many factors like the bulk of casting, type of moulding processes, number of castings required and the anticipated difficulty of moulding,
Oil tank: The oil tank is usually mounted on the engine; it may be a separate unit or part of an external gearbox called the sump. It has provision to allow the system to be f
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Composites have low shear strengths compared to longitudinal strengths. The ILSS test is a simple 3 point bend test, requiring a small amount of material. A span to depth ratio
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