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31-05-2015, 19:53

Helicopters

Author: Charles Messenger
Helicopters (20th Century Weapons)
Franklin Watts
1985
Format: PDF
Pages: 54
Language: English
Size: 45 MB

A helicopter is a type of rotorcraft in which lift and thrust are supplied by rotors. This allows the helicopter to take off and land vertically, to hover, and to fly forward, backward, and laterally. These attributes allow helicopters to be used in congested or isolated areas where fixed-wing aircraft and many forms of vertical takeoff and landing aircraft cannot perform.