This comprehensive guide provides an in-depth look at the Boeing CH-47 Chinook, a twin-engine, tandem rotor heavy-lift helicopter. It covers the history of the Chinook, its design and capabilities, and its various uses in military and civilian operations.
From Wikipedia
The Boeing CH-47 Chinook is a tandem-rotor helicopter originally developed by American rotorcraft company Vertol and now manufactured by Boeing Defense, Space & Security. The Chinook is a heavy-lift helicopter that is the second-heaviest lifting Western helicopter to the Sikorsky CH-53. Its name, Chinook, is from the Native American Chinook people of Oregon and Washington.