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The Pratt & Whitney Canada PT6 is a turboprop aircraft engine produced by Pratt & Whitney Canada.Its design was started in 1958, it first ran in February 1960, first flew on 30 May 1961, entered service in 1964, and has been continuously updated since.
Congress only approved the purchase when it was assured that a U.S. source would be found for the PT6T engines. This source was Pratt & Whitney Engine Services in Bridgeport, West Virginia, which was established in 1971 to assemble and test new T400-WV-402 engines. As a result, the U.S. military ordered 294 Bell 212s under the designation UH-1N ...
The first free-turbine gas turbine engine was the Bristol Theseus turboprop. [8] This was the first Bristol gas turbine and its broad design had been produced by Frank Owner at Tockington Manor. It first ran in July 1945 and in December 1946 was the first turboprop to pass a 100 hour type test. [8] Some large turboprop engines, such as the ...
A series of (e.g. labyrinth) seals allow a small flow of bleed air to wash the turbine disc to extract heat and, at the same time, pressurize the turbine rim seal, to prevent hot gases entering the inner part of the engine. Other types of seals are hydraulic, brush, carbon etc.
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For this reason turboprop engines are not commonly used on aircraft [4] [5] [6] that fly faster than 0.6–0.7 Mach, [7] with some exceptions such as the Tupolev Tu-95. However, propfan engines, which are very similar to turboprop engines, can cruise at flight speeds approaching 0.75 Mach. To maintain propeller efficiency across a wide range of ...
Data from Jane's All the World's Aircraft 1976–77 General characteristics Crew: 2 Capacity: 4–6 passengers Length: 34 ft 8 in (10.57 m) Wingspan: 42 ft 8 + 1 ⁄ 4 in (13.011 m) (over tip tanks) Height: 12 ft 9 in (3.89 m) Wing area: 229 sq ft (21.3 m 2) Airfoil: NACA 63 2 -415 at root, 63A212 at tip Empty weight: 4,870 lb (2,209 kg) Max takeoff weight: 9,000 lb (4,082 kg) Fuel capacity ...
For an aircraft engine, changes in airspeed or altitude cause changes in air speed and density through the engine, which would then have to be manually adjusted for by the pilot. A fuel control unit attempts to solve those problems by acting as an intermediary between the operator's controls and the fuel valve.