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Tandem-rotor Helicopter
A tandem-rotor aircraft is an aircraft with two large helicopter rotor assemblies mounted one in front of the other in the horizontal plane. This configuration is mainly used for large cargo helicopters. Such aircraft are often informally referred to as "Chinooks," after the CH-47 Chinook, one of the first widely adopted heavy-lift helicopters with a tandem-rotor configuration. Design Single-rotor helicopters need a mechanism to neutralize the Aircraft principal axes, yawing movement produced by the single large rotor. This is commonly accomplished by a tail rotor, coaxial rotors, and the NOTAR systems. 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 (force), lift, whereas a single-rotor helicopter uses some of the engine power to counter the torque. An alternative is to mount two rotors in a Coaxial rotors, coaxial configuration. The first successful ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CH-46 Sea Knight Helicopter
The Boeing Vertol CH-46 Sea Knight is an American medium-lift tandem rotors, tandem-rotor transport helicopter powered by twin turboshaft aircraft engine, engines. It was designed by Piasecki Helicopter, Vertol and manufactured by Boeing Helicopters, Boeing Vertol following Vertol's acquisition by Boeing. Development of the Sea Knight, which was originally designated by the firm as the Vertol Model 107, commenced during 1956. It was envisioned as a successor to the first generation of rotorcraft, such as the Piasecki H-21, H-21 "Flying Banana", that had been powered by Reciprocating engine, piston engines; in its place, the V-107 made use of the emergent turboshaft engine. On 22 April 1958, the V-107 prototype performed its maiden flight. During June 1958, the US Army awarded a contract for the construction of ten production-standard aircraft, designated as the YHC-1A, based on the V-107; this initial order was later cut down to three YHC-1As. During 1961, the United States Mari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
