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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.
The four ships of this design were built to prove the practicality of the KaMeWa variable pitch propeller system in high SHP applications. Although the system did function well the high initial and subsequent maintenance costs associated with having two 20,000 hp (15,000 kW) B&W diesel engines, together with the inferior steel used for the ...
Variable-pitch propeller can refer to: Variable-pitch propeller (marine) Variable-pitch propeller (aeronautics) This page was last edited on 30 ...
5 Variable pitch. 2 comments. 6 Propeller spinner. 2 comments. 7 How do propellers work? 1 comment. 8 Dubious claim for impetus to develop feathering propellers. 5 ...
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]
This allows the crew to work on buoys in difficult weather conditions. [5] The ship's crane extends to 60 feet (18 m) and can lift 40,000 pounds (18,000 kg) onto her buoy deck, which is 2,875 square feet in area. [6] [7] Spar is armed with two 50-caliber machine guns and a variety of small arms for boarding operations. [4]