Blimp

A blimp is a type of non-rigid airship, a lighter-than-air aircraft whose shape is maintained by internal pressure within a flexible envelope. Unlike rigid airships, blimps have no internal framework or keel; the envelope itself provides the buoyant volume and shape. The lifting gas is typically helium for safety, though early blimps or related airships sometimes used hydrogen. Buoyancy is achieved when the weight of the displaced air exceeds the total weight of the blimp, its engines, and payload.

A blimp consists of an inflated fabric or composite envelope, a gondola or capsule suspended beneath it, and one or more propulsion units with control surfaces. Engines usually drive propellers for forward movement, while rudders and fins provide directional control. The envelope is pressurized to hold its shape, and altitude is adjusted through ballast management and, in some designs, selective venting of gas or incorporation of ballast systems. The craft is steered with a combination of thrust, drag, and aerodynamic control surfaces, while weather and wind conditions strongly influence performance.

Historically developed in the early 20th century, blimps have been used for advertising, broadcasting and film work, surveillance, patrol, research, and sightseeing. The Goodyear Blimp is among the most recognizable modern examples, commonly seen at events and in media coverage. Blimps are favored for their stable platform, wide visibility, and relatively low cost compared with fixed-wing aircraft for certain roles, though they travel more slowly and have limited payload and range compared with heavier aircraft.

Safety considerations center on the use of lifting gas and weather sensitivity. Helium reduces fire risk compared with hydrogen but blimps remain vulnerable to strong winds, storms, and punctures. Operations are subject to aviation regulations and require trained crew for navigation, maintenance, and weather assessment.