| Summary: | An airship or dirigible is a type of aerostat or "lighter- than-air aircraft" that can be steered and propelled through the air using rudders and propellers or other thrust mechanisms. Unlike aerodynamic aircraft such as fixed-wing aircraft and helicopters, which produce lift by moving a wing through the air, aerostatic aircraft, such as airships and a balloons, stay aloft by filling a large cavity with a lifting gas. The main types of ship are non rigid (or blimps), semi-rigid and rigid. Blimps are mall airships without internal skeletons. Semi-rigid airships are slightly larger and have e form of internal support such as a fixed kod . Rigid airships with full skeletons, such as the Zeppelin transoceanic models, have nearly disappeared after several high-profile catastrophic accidents during mid-20th century.
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