A non-rigid airship or a blimp differs from a rigid airship (e.g. a Zeppelin) in that it does not have a rigid structure that holds the airbag in shape.

How it works

These aircraft rely on a higher pressure of the gas (usually helium) inside the envelope.

Although a blimp can be steered and thus qualifies as a dirigible, that term is more commonly used with rigid airships.

Blimps keep their shape with internal overpressure, typically the only solid parts are the passenger car (gondola) and the tail fins.

A non-rigid-airship that uses heated air instead of a light gas (such as Helium) as a lifting medium is called a hot air airship.

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