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The French firm Ratier produced variable-pitch propellers of various designs from 1928 onwards, relying on a special ball-bearing helicoidal ramp at the root of the blades for easy operation. Walter S Hoover's patent for a variable pitch propeller was filed in the U.S. Patent Office in 1934.
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.
On most variable-pitch propellers, the blades can be rotated parallel to the airflow to stop rotation of the propeller and reduce drag when the engine fails or is deliberately shut down. This is called feathering, a term borrowed from rowing. On single-engined aircraft, whether a powered glider or turbine-powered aircraft, the effect is to ...
A controllable-pitch propeller A variable-pitch propeller on a fishing vessel. Variable-pitch propellers may be either controllable (controllable-pitch propellers) or automatically feathering (folding propellers). Variable-pitch propellers have significant advantages over the fixed-pitch variety, namely:
This image is a derivative work of the following images: File:Controllable_pitch_propeller_schematic.JPG licensed with PD-self . 2008-06-22T17:30:17Z Ke4roh 2128x1260 (154272 Bytes) same picture as before, just adjusted for on-screen viewing.
Schematic diagram showing the operation of a turboprop engine Propulsive efficiency for different engine types and Mach numbers. ... (variable-pitch) propellers. The ...
Variable-pitch propeller can refer to: Variable-pitch propeller (marine) Variable-pitch propeller (aeronautics) This page was last edited on 30 ...
The Voith Schneider propeller was originally a design for a hydro-electric turbine. [2] Its Austrian inventor, Ernst Schneider, had a chance meeting on a train with a manager at Voith's subsidiary St. Pölten works; this led to the turbine being investigated by Voith's engineers, who discovered that although it was no more efficient than other water turbines, Schneider's design worked well as ...
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