aircraft
type: Concept
narrower: helicopters

concepts
type: Collection
type: ConceptGroup
member: helicopters

helicopters
definition: Helicopters are the most common type of rotary-wing aircraft, which generate lift through the revolution of wings (rotor blades) around a mast. In the case of helicopters, these rotors are driven by one or more engines throughout the flight, and the rotors also provide multidirectional thrust. [Source: Encyclopedia of Transportation: Social Science and Policy; Helicopters]
broader: aircraft
type: Concept