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Tandem-rotor helicopters, however, use counter-rotating rotors, with each cancelling out the other's torque. Therefore, all of the power from the engines can be used for lift, whereas a single-rotor helicopter uses some of the engine power to counter the torque. [1] An alternative is to mount two rotors in a coaxial configuration.
This is an accepted version of this page This is the latest accepted revision, reviewed on 29 December 2024. Military transport tiltrotor "V-22" redirects here. For other uses, see V22 (disambiguation). V-22 Osprey A MV-22 being used during a MAGTF demonstration during the 2014 Miramar Air Show General information Type Tiltrotor military transport aircraft National origin United States ...
The Chinook is a heavy-lift helicopter that is among the heaviest lifting Western helicopters. Its name, Chinook, is from the Native American Chinook people of Oregon and Washington state. The Chinook was originally designed by Vertol, which had begun work in 1957 on a new tandem-rotor helicopter, designated as the Vertol Model 107 or V-107.
A transverse-rotor aircraft is an aircraft with two large horizontal rotor assemblies mounted side by side. Single-rotor helicopters (unicopters) need an additional tail rotor or tail exhaust to neutralize the reactional angular momentum produced by the main rotor. Transverse rotor helicopters, however, use counter-rotating rotors, with each ...
In December 2006, Columbia Helicopters purchased the type certificate of the Model 107 from Boeing, with the aim of eventually producing new-build aircraft themselves. [48] In 2023, Columbia Helicopters began a program of purchasing older Model 107-II and CH-46E airframes, and refurbishing them into Model 107-IIs for sale.
His test rig, with two wheels and handlebars, resembled a wheelbarrow with an engine mounted in it, with a tall vertical shaft driving two counter-rotating propellers. [9] In 1922, Henry Berliner developed a helicopter based on a surplus Nieuport 23 fuselage with a 220 hp radial engine driving two wing mounted counter-rotating rotors. The ...
AAH sought an attack helicopter based on combat experience in Vietnam, with a lower top speed of 145 kn (167 mph; 269 km/h) and twin engines for improved survivability. Lockheed offered the CL-1700, a modified version of the Cheyenne with two engines and omitted the pusher propeller, without success. [44]
The QTR is a larger, four rotor version of the V-22 with two tandem wings sets of fixed wings and four tilting rotors. In January 2013, the FAA defined US tiltrotor noise rules to comply with ICAO rules. A noise certification will cost $588,000, same as for a large helicopter. [15] [16]