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Dowty Rotol R391 six-blade composite controllable- and reversible-pitch propeller of a C-130J Super Hercules. In aeronautics, a variable-pitch propeller is a type of propeller (airscrew) with blades that can be rotated around their long axis to change the blade pitch.
In marine propulsion, a variable-pitch propeller is a type of propeller with blades that can be rotated around their long axis to change the blade pitch. Reversible propellers—those where the pitch can be set to negative values—can also create reverse thrust for braking or going backwards without the need to change the direction of shaft revolution.
Together they developed the synchronizing reversible pitch propellers (1922) and hydro-controllable Propeller. He jointly developed military propellers improvements with the chief engineer of the Propeller Research Department, Frank W. Caldwell. McCauley owns 55 patents and with Caldwell holds multiple joint patents on propeller innovations.
An alternative design is the controllable-pitch propeller (CPP, or CRP for controllable-reversible pitch), where the blades are rotated normally to the drive shaft by additional machinery – usually hydraulics – at the hub and control linkages running down the shaft. This allows the drive machinery to operate at a constant speed while the ...
Robertson incorporated many features of the Skyshark into the Wren Aircraft Company's Wren 460. A conversion of the Cessna 180 or 182 airframe, the Wren 460 featured full-span double-slotted flaps, movable spoilers to assist the ailerons with roll control, and an optional reversible pitch propeller for shorter landing runs. Like the Skyshark ...
One of four 6-bladed Dowty Rotol R391 composite controllable- and reversible-pitch propellers on the Lockheed Martin C-130J Super Hercules. The company was formed as Rotol Airscrews in 1937 by Rolls-Royce and Bristol Engines to take over both companies' propeller development, [1] the market being too small to support more than one company.
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