Boeing CH-47 Chinook Medium-Lift, Tandem Rotor Transport Helicopter
The Boeing CH-47 Chinook tandem-rotor helicopter became a widely-used and widely-exported medium-lift platform for its time - amazingly it remains in service today.
Authored By Staff Writer; Content ©www.MilitaryFactory.com
The Boeing "Chinook" line of medium-lift, tandem-rotor transport helicopters has been a mainstay utility system for the United States Army (and others) for decades since its introduction in 1962. The iconic design was given a tandem-rotor approach to provide the necessary lift properties when hauling medium-class loads over the battlefield - able to transport weaponry, supplies, a full complement of combat-ready troops, and other useful components to and from operating points. Despite its 1960s origins, the CH-47 remains in service throughout the world and should continue to be one of the more versatile transport helicopters ever produced - its importance is such that the series is scheduled for retirement no sooner than 2060 while being set to become the U.S. Army's first "100 Year" aircraft.
The story of the CH-47 began in the mid-1950s with the U.S. Army looking to replace its stock of Sikorsky CH-37 "Mojave" transport helicopters. Production of this system - which was not an outright success due to operating expenses, size, and reliance on piston-driven engines - was limited to just 154 units. Service began in July of 1956 and ended relatively quickly in the late 1960s. The turbine engine soon arrived and replaced piston engines in helicopters through such successful products as the Bell UH-1 "Huey" medium-lift transport helicopter so thought was no being given to an all-new, medium-lift system based on the more powerful and capable drive units.
Various contractors were in play early on to deliver a solution to the ongoing Army requirement. To help sell the idea of a new turbine -powered platform, Vertol engineers fleshed out their "V-107" of 1957 and this was enough to prove the investment as a formal contract followed the following year to be based on the developmental "YHC-1A" designation. Three prototypes would be featured for evaluation.