ABSTRACT
Ahelicopter is an aircraft withwhirling rotor blades instead offixed wings. It gets its lift from a set of spinning blades, called a rotor, which are turned by an engine.
The helicopter is one of the most useful aircraft. It does not need airfields to take off and land, and its flying abilities include vertical landings and takeoffs in addition to hovering. The name helicopter means “spiral wing”—a helicopter seems to spiral, or twist, its way through the air as it flies.
