The Boeing CH-47 Chinook is a tandem-rotor helicopter developed by American rotorcraft company Vertol and manufactured by Boeing Vertol. The Chinook is a heavy-lift helicopter that is among the heaviest-lifting Western helicoptersTop speed: 302 km/hIntroduced: 1962Cruise speed: 291 km/hUnit cost: 35,000,000–35,000,000 USD (2008)Engine type: Honeywell T55First flight: 21 September 1961