초록 ▼

A variable pitch propeller, particularly suited for use with turbine engines, includes a range of beta control in low pitch and reverse pitch positions, in which the pilot can obtain a ground angle range with substantially lower angles in relation to the flight idle position. This is accomplished by

A variable pitch propeller, particularly suited for use with turbine engines, includes a range of beta control in low pitch and reverse pitch positions, in which the pilot can obtain a ground angle range with substantially lower angles in relation to the flight idle position. This is accomplished by the provision of lost motion connections in the form of sliding sleeves mounted on the beta feedback rods which come into operation at a particularly defined low pitch angle, under control of the pilot, and permits the blades to move to a still lower pitch angle for ground operations, by providing for relative movement between the blade yoke and the beta feedback rods.

대표청구항 ▼

In a variable pitch hydraulic aircraft propeller in which at least a portion of the propeller pitch range is controlled directly by the pilot by manipulating a fluid control valve, and in which a blade yoke in a propeller hub is positioned by the blades to move a feedback mechanism including a beta

In a variable pitch hydraulic aircraft propeller in which at least a portion of the propeller pitch range is controlled directly by the pilot by manipulating a fluid control valve, and in which a blade yoke in a propeller hub is positioned by the blades to move a feedback mechanism including a beta feedback rod for repositioning the fluid control valve in accordance with the position of the blades, the improvement for effecting a blade shift into a low pitch position through an angle which exceeds that available to the pilot by selecting a ground idle range, comprising means on said feedback rod forming a movable stop, means on said movable stop engageable by said blade yoke, said movable stop being movable between a normally seated position and a moved position, spring means biasing said stop into said normally seated position, said stop being positioned on said rod so as to be engaged by said yoke upon the selection of a ground idle position by the pilot and movable against said spring means to said moved position by movement of said blades under the control of said valve without accompanying movement of said feedback rod providing for a shifting of said blades to a lower pitch position and thereafter providing for the reclosing of said fluid control valve following the interruption of said movement of said feedback rod.