Fluid reaction surfaces (i.e. – impellers) – Interrelated controls for impeller and drive means – Pitch adjustment related to drive brake or clutch operation
Patent
1990-07-23
1993-09-07
Look, Edward K.
Fluid reaction surfaces (i.e., impellers)
Interrelated controls for impeller and drive means
Pitch adjustment related to drive brake or clutch operation
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.
Bulman David E.
Hermans Thomas C.
Hora Petr
Joyce David L.
Miller Edwin K.
General Electric Company
Larson James A.
Look Edward K.
Rafter John R.
Squillaro Jerome C.
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