Aircraft pitch change mechanism

Fluid reaction surfaces (i.e. – impellers) – Interrelated controls for impeller and drive means – Pitch adjustment related to drive brake or clutch operation

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Details

416 46, 416129, 416130, 416153, 416160, 416162, B64C 1132, B64C 1148

Patent

active

052422658

ABSTRACT:
A system for changing pitch in aircraft propfans is disclosed, in which a motor, located at a stationary position, changes pitch of the blades by of a gear train. Three features of the system are that a feather brake can override the motor and drive the blades toward feather; a unison brake can prevent pitch from undergoing excursions toward fine pitch when propeller speed exceeds a limit; and the motor is non-rotating in the absence of pitch change. A pair of such systems can be used in a counterrotating propfan system, in order to independently change pitch of the propfans.

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Article-"A New Design for a Contra-Prop"14 Aeronautical Engineering.

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