fly with a positive aerostatic contribution, usually equal to the empty weight of the system, and the variable payload is sustained by propulsion or aerodynamic contribution.

Classification

Airships are classified according to their method of construction into rigid, semi-rigid, and non-rigid types.

Rigid

A rigid airship has a rigid framework covered by an outer skin or envelope. The interior contains one or more gasbags, cells, or balloons to provide lift. Rigid airships are typically unpressurised and can be

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