It is designed to perform missions like a conventional helicopter with the long-range, high-speed cruise performance of a turboprop aircraft.

He argues that a mix of conventional helicopters would be cheaper than the $23 million aircraft.

Like a conventional helicopter, altitude is controlled by raising or lowering the swashplate assembly.

It was the second successful experimental tiltrotor aircraft and the first to demonstrate the concept's high speed performance relative to conventional helicopters.

Unlike a conventional helicopter, this mechanically simple design avoids the need for a tail rotor.

The XV-2's stoppable-rotor design was intended to allow it to hover and fly at low speed like a conventional helicopter.

The drones can maneuver through tunnels and over bridges - places beyond the reach of conventional helicopters.

Though this method is simple, and eliminates torque reaction, prototypes that have been built are less fuel efficient than conventional helicopters.

Typically a backpack helicopter differs from a conventional helicopter in two ways.