Boeing Vertol XCH-62

The Boeing Vertol XCH-62, Model 301, was a triple-turbine heavy-lift helicopter project designed for the United States Army by Boeing Vertol. Approved in 1971, one prototype reached 95 percent completion before the programme was cancelled in 1975, and that prototype was scrapped in 2005. It grew from a Heavy Lift Helicopter request issued in November 1970 and was a tandem-rotor design with four blades on each 92 ft rotor, a high-mounted fuselage and widely spaced landing gear that would let it straddle cargo, and it was meant to lift a standard 20-foot MILVAN container weighing up to 22.4 short tons. Three Allison XT701-AD-700 turboshafts powered it, and it was designed as the first helicopter with fly-by-wire flight controls and no mechanical backup. It was the largest helicopter ever built in the western countries.