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A semirigid airship is a type of lighter-than-air aircraft that maintains its shape through a combination of internal gas pressure and a structural keel. Unlike nonrigid airships (blimps), which rely solely on gas pressure, semirigids have a rigid keel that runs along the base of the gas bag and supports the car or gondola. This allows them to be larger than blimps.

Airships, also known as dirigibles, consist of a gas-filled bag, a car for crew and passengers, engines, and rudders for steering. Common lifting gases include hydrogen and helium. While hydrogen offers greater lift, helium is safer due to its nonflammability. Semirigid airships, along with nonrigid and rigid types, were significant in early aviation but declined in popularity due to cost, speed, and safety concerns, particularly after incidents like the Hindenburg disaster.1234

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