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Encyclopedia - Boeing Vertol CH-47 Chinook

Piasecki\'s corporation became The Vertol Company in 1956, which went on to develop the civilian Vertol 107 and two highly successful military tandem rotor models, the CH-46 and CH-47.

The Boeing-Vertol CH-47 Chinook was developed in 1956 to service the need by the US Army for an all weather turbine powered cargo helicopter able to operate under harsh environmental conditions.

The first flight of YCH-47A flew a tandem configured counter rotating main rotor blade system to eliminate the need for a tail rotor and was powered by two 2200 Lycoming T55 turbines oddly mounted on the exterior of the rear rotor pylon.

The high mounted rotors and the lack of a tail rotor meant that the loading bay measured a staggering 2.29m wide, 1.98m high and more than 9.2m long.

By 1972 there were more than 550 Chinooks operational in Vietnam supplying armament and personnel to the US Army and evacuating civilians.

The model A was soon followed by model B with a variety of improvements which included 2850 hp turbines. In total more than 800 Chinooks were built in Philadelphia and a small number of model C Chinooks were built in Italy.

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Boeing Vertol CH-47D Chinook


First Flight : 11 May 1979
Country of Origin : USA


Number Of Engines : Two
Powerplant type : Avco Lycoming T55-L-712 turboshafts
Max Power Rating : 3,356kW (4,500shp)


Length, Rotors Turning : 30.18m (99ft)
Height : 5.68m (18ft 7.8in)
Main Rotor Diameter : 18.29m (60ft)


Empty Weight : 10,475kg (23,093lb)
Max Take-off Weight : 22,680kg (50,000lb)

Landing Gear

Type : Fixed quadricycle landing gear with two fixed twin-wheel nose units and two fully steerable single-wheel rear units
Wheelbase : 6.86m (22ft 6in)


Max Speed At Cruising Level : 138kt (255km/h; 160mph)

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