posted by Jiri Wagner
Development of the medium lift Boeing Vertol (models 114 and 414) CH-47 Series Chinook began in 1956. Since then, the effectiveness of the Chinook has been continually upgraded by successive product improvements, the CH-47A, CH-47B, CH-47C, and CH-47D.
CH-47A, first delivered for use in Vietnam in 1962, is a tandem-rotor medium transport helicopter. The Chinook's primary mission is moving artillery, ammunition, personnel, and supplies on the battlefield. It also performs rescue, MedEvac, parachuting, and aircraft recovery.
CH-47D was the result of June 1976 contract for a modernized Chinook. Three airframes, CH-47A, CH-47B, and a CH-47C, were stripped-down to their basic airframes and then rebuilt with improved systems to provide three CH-47D prototypes. Improvements included upgraded power plants, rotor transmissions, integral lubrication and cooling for the transmission systems, and fiberglass rotor blades. Other improvements included a redesigned cockpit to reduce pilot workload, redundant and improved electrical systems, modularized hydraulic systems, an advanced flight control system, and improved avionics. The Chinook has two tandem three-bladed counter-rotating fiberglass rotors. The CH-47D is powered by two Allied Signal Engines T55-L-712 3750 shp turboshaft engines.
The CH-47D was rolled-out in March 1979. The CH-47D carrys twice the load of a CH-47A and has improved performance. The CH-47D can operate at night and in nearly all weather conditions. The Chinook can accommodate a wide variety of internal payloads, including vehicles, artillery pieces or personnel.
|Primary function||Two rotors medium lift assault helicopter|
|Contractor||Boeing Vertol Company|
|Power plant||Two Avco Lycoming T55-L-712 turboshafts|
|Thrust||2x 3,750 HP||2x 2,796 kW|
|Fuselage length||51 ft||15,54 m|
|Height||18.63 ft||5.68 m|
|Rotor diameter||60 ft||18.29 m|
|Weight||empty||23,094 lb||10,475 kg|
|max. takeoff||50,000 lb||22,680 kg|
|Speed||max.||181 mph||291 km/h|
|cruising||159 mph||256 km/h|
|Initial climb rate||22.3 ft/s||6.8 m/s|
|Range||115 miles||185 km|
|Ceiling||22,100 ft||6,735 m|
|Crew||Two or three|
|Accommodation||Up to 44 troops, 24 stretchers and 2 attendants, vehicles or freight. A sling load of 28,000lb (12,700kg) is possible as a flying crane.|
|Armament||Can be equipped with two door mounting M60D 7.62mm machine guns on the M24 armament subsystem and a ramp mounting M60D using the M41 armament subsystem.|
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