Gliders and Hang-gliders
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MODERN GLIDERS ARE AMONG the most graceful and aerodynamically efficient of all aircraft. Unpowered but with a large wingspan (up to about 25m, or 82ft), gliders use currents of hot air, rising air (thermals) to stay aloft, and a rubber, elevators, and ailerons for control. Modern gliders have achieved flights of more than 1,450 km (900miles). Hang gliders consist of a simple frame across which rigid or flexible material is stretched to form the wings. The pilot is suspended below the wings in A-frame steers by shifting weight from side to side. Like glider, hang-gliders rely on thermals for lift.