The three main types of airships are rigid, semi-rigid, and non-rigid. Non-rigid airships are what people commonly call blimps. Blimps rely on internal pressure to maintain their shape.

The first used were Rigid Airships, which featured a full frame supporting the blimp's shell, ... The most recent Zeppelin NT blimps — of which there are four — are Semi-Rigid, ...

While commonly referred to as a blimp, Goodyear Wingfoot One is technically a semi-rigid airship because it has a rigid internal frame. Blimps, by definition, have no internal frame. This article ...

For airships larger than 500,000 cubic ft. the non-rigid type can be, and has been, used, but its efficiency tends to compare less favourably with the semi-rigid type as size is increased.

Goodyear began making airships for the U.S. Navy in 1917, and its first blimp – the first commercial non-rigid airship flown using helium – launched years later, becoming a marketing tool.

Goodyear began making airships for the U.S. Navy in 1917, and its first blimp — the first commercial non-rigid airship flown using helium — launched years later, becoming a marketing tool.

Goodyear began making airships for the U.S. Navy in 1917, and its first blimp — the first commercial non-rigid airship flown using helium — launched years later, becoming a marketing tool.