Glider

Unpowered aircraft are a group of aerial vehicles that can fly without onboard propulsion. They can be classified as gliders, balloons and kites. In this instance, 'flight' means a trajectory that is not merely a vertical descent such as a parachute. In the case of kites, the flight is obtained by tethering to a fixed or moving object, perhaps another kite. In the case of balloons, the flight is free but there is little directional control. The remainder of this group are the heavier-than-air craft such as gliders, hang gliders. and paragliders that have complete directional control and so can fly freely. The first manned aircraft were kites, balloons and gliders. Kites are recorded in ancient Chinese history as being used for lifting...