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Internal structure of semi-rigid airship. A semi-rigid airship is an airship which has a stiff keel or truss supporting the main envelope along its length. The keel may be partially flexible or articulated and may be located inside or outside the main envelope.
The Giant (Russian: Гигант) was a semi-rigid airship designed by engineers Alexander Kovanko and Athanasius Shabsky. It was the largest dirigible built in Russia. In subsequent years, no airships of this size were created. The largest airship built in Russia, the SSR W-6 (Osoaviakhim), had a volume of only 18 500 m 3.
Semi-rigid airships maintain their shape by internal pressure, but have some form of supporting structure, such as a fixed keel, attached to it. Rigid airships have an outer structural framework that maintains the shape and carries all structural loads, while the lifting gas is contained in one or more internal gasbags or cells. [4]
The airship was built with a semi-rigid structure. The hull acts as a pneumatic support structure supported by rigid elements, today known as Tensegrity. The rigid structural components of the airship are the nose structure, the system shaft, the center shaft, the aft unit cross shaft and the stern pan with engine base.
The Zeppelin NT is a semi-rigid airship. It is unlike both the original Zeppelins that had a rigid skeleton and non-rigid blimps. It has an internal triangular truss made of graphite-reinforced plastic and three longitudinal girders made of welded aluminium which connect the triangular elements along the length of the frame. [11]
Construction of USS Shenandoah, 1923, showing the framework of a rigid airship. A rigid airship is a type of airship (or dirigible) in which the envelope is supported by an internal framework rather than by being kept in shape by the pressure of the lifting gas within the envelope, as in blimps (also called pressure airships) and semi-rigid airships.
Euro Airship is planning an around-the-world, non-stop flight with Solar Airship One. It would be the first flight to make the trip without using fossil fuels.
In contrast to the Zeppelins, the Parsevals were non-rigid or semi-rigid airships, with little or no stiffening structure inside the fabric envelope. The Zeppelins had a rigid internal framework made of duralumin. Both types relied on hydrogen gas to provide lift. Diagram of an early Parseval airship.