Apparatus for indicating the pitch of turbofan blades

Fluid reaction surfaces (i.e. – impellers) – With measuring – testing – signalling or inspection means

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Details

416147, 416170R, 25023113, 25023116, 32420718, 32420719, 32420725, 32420722, 34087025, 34087029, 34087031, F01D 124

Patent

active

052115399

ABSTRACT:
Apparatus indicates changes in blade pitch of variable pitch blades by detecting relative displacements of first and second members of a blade pitch actuator. The members are selectively displaced to change the pitch of the blades. The apparatus includes sensors which provide output signals to a microprocessor, which determines displacement of each member with respect to a frame of reference. The microprocessor takes the difference between the displacements of the two members to determine the relative displacement, which is indicative of a change in blade pitch.

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