Rolls-royce Corporation

Robert E Wilson

Antony Morgan

Jonathan E Holt

A engine such as a gas turbine engine has a bladed rotorhaving variable pitch blades. In normal operation, the pitch angle of the bladesis controlled by a primary pitch control system. A back-up system is provided for controlling the blades, for example to displace them to a feathered condition, in the event of failure of the primary pitch control system. The back-up system comprises a pumpmounted on the rotor, and driven by relative rotation between the rotorand a contra-rotating rotor. In response to a failure signal on a conduit, the pump delivers hydraulic fluid under pressure to a secondary actuator, which acts on the blade

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Derby, United Kingdom

Robert E Wilson