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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.
Kamewa started as a brand name of the controllable-pitch propellers manufactured by KMW. KMW was founded in the city of Karlstad in 1860. KMW also manufactured pulp and paper machines for paper mills and hydro power turbines. Kamewa was acquired by the British company Vickers plc in 1986. In 1999, Rolls-Royce acquired Vickers. [1]
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.
A propeller (often called a screw if on a ship or an airscrew if on an aircraft) is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral which, when rotated, exerts linear thrust upon a working fluid such as water or air. [1]
Variable-pitch propeller (aeronautics) Variable-pitch propeller (marine) Voith Schneider Propeller This page was last edited on 27 March 2024, at 21:42 (UTC). Text is ...
Variable-pitch propeller can refer to: Variable-pitch propeller (marine) Variable-pitch propeller (aeronautics) This page was last edited on 30 ...
Self-actuating variable pitch propellers A self-feathering propeller is not more efficient than a fixed bladed prop, as neither type can adopt an optimal blade angle. Exceptions are the Bruntons Autoprop , Darglow FeatherStream , and the V-Prop , all of which are not merely folding propellers, but are self-actuating variable-pitch propellers .
Over 100,000 Chauvière propellers were built for Allied aircraft during the First World War, around 25% of total production. After the war Chauvière carried out pioneering work in the construction of metal propellers, particularly the use of forged duralumin, and also worked on the development of variable-pitch propellers.