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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.
During 1960, Dowty Group acquired Rotol Airscrews, giving it a propeller manufacturing capability; this led to the creation of the Dowty Rotol division. [5] In 1961, it acquired British aviation company Boulton Paul Aircraft , a former large scale manufacturer of aircraft, involved in the production of research aircraft as well as aviation ...
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.
Haw Propeller - Germany; Helices E-PROPS - Electravia - France (2008–present) Hélices Halter - France (1987-2014) Hamilton Standard - United States (1929-1999) Hamilton Sundstrand - United States (1999-2012) Hartzell Propeller - United States (1917–present) Hegy Propellers - United States; Heine Propellers - Germany; Helix-Carbon - Germany ...
Like any other fan, propeller or rotor, a ducted fan is characterised by the number of blades. The Rhein Flugzeugbau (RFB) SG 85 had three blades, while the Dowty Rotol Ducted Propulsor had seven. [3] [4] The blades may be of fixed or variable pitch. See: Fan (machine)
The SR.N6 was powered by a single marinised model of the Bristol Gnome turboshaft engine; this drove both a single rear-facing 9 ft (2.74 m) diameter 4-bladed Dowty Rotol variable-pitch propeller along with a 7 ft (2.13 m) diameter centrifugal lift fan. [10]
To maintain speed, the engines were upgraded to four 3,800 shaft horsepower (2,834 kW) models, which were fitted with four 21 ft (6.4 m) diameter steerable Dowty Rotol propellers. The work cost around £5 million for each craft, and they were designated Mark IIIs; the improvements allowed them to operate in seas up to 11 ft 6 in (3.5 m) high ...
Propellers: 4-bladed Dowty Rotol constant-speed fully-feathering propellers, 12 ft 0 in (3.66 m) diameter; Performance. Cruise speed: 244 kn (281 mph, 452 km/h)
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