초록 ▼

A pitch feathering system for a gas turbine driven aircraft propeller having multiple variable pitch blades utilizes a counter-weight linked to the blades. The weight is constrained to move, when effecting a pitch change, only in a radial plane and about an axis which rotates about the propeller axi

A pitch feathering system for a gas turbine driven aircraft propeller having multiple variable pitch blades utilizes a counter-weight linked to the blades. The weight is constrained to move, when effecting a pitch change, only in a radial plane and about an axis which rotates about the propeller axis. The system includes a linkage allowing the weight to move through a larger angle than the associated pitch change of the blade.

대표청구항 ▼

An aircraft propulsor system comprising: a gas turbine engine for generating a high energy gas stream; a propulsor stage coupled to said engine, said propulsor stage including first and second intermeshed counterrotating turbine blade sets driven by said gas stream and fore and aft multi-bladed prop

An aircraft propulsor system comprising: a gas turbine engine for generating a high energy gas stream; a propulsor stage coupled to said engine, said propulsor stage including first and second intermeshed counterrotating turbine blade sets driven by said gas stream and fore and aft multi-bladed propellers extending radially outward of said propulsor stage, each of said blade sets being operatively connected to corresponding ones of said fore and aft multi-blade propellers, one of said blade sets having radially inwardly extending blades and a radially outer blade support ring, the other of said blade sets having radially outwardly extending blades and a radially inner blade support ring and each of said propellers including a plurality of propeller blades; controlling means coupled to said propeller blades of said fore and aft propellers for controlling the pitch thereof; propeller blade pitch feathering means for automatically rotating said propeller blades to a predetermined pitch angle upon failure of said controlling means, said feathering means comprising: a unison ring interconnecting said blades of a corresponding one of said propellers for effecting conjoint pitch change of each of the blades; a plurality of counter-weights rotatably attached to said unison ring for rotation therewith about a rotational axis of said one of said propellers, each of said counter-weights being rotatable about an axis of rotation rotatable about said propeller rotational axis, and said counter-weights being rotatable only in a direction which effects radial displacement of said counter-weights with respect to said propeller axis; and means coupled to said counter-weights for driving said propeller blades to said predetermined pitch when said counter-weights rotate radially outward from said propeller axis.