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The outer shape of the airship is maintained by gas pressure, as with the non-rigid "blimp". Semi-rigid dirigibles were built in significant quantity from the late 19th century but in the late 1930s they fell out of favour along with rigid airships. No more were constructed until the semi-rigid design was revived by the Zeppelin NT in 1997.
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.
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]
The main types of airship are non-rigid, semi-rigid and rigid airships. [3] Non-rigid airships, often called "blimps", rely solely on internal gas pressure to maintain the envelope shape. Semi-rigid airships maintain their shape by internal pressure, but have some form of supporting structure, such as a fixed keel, attached to it.
SSSR-V6 OSOAVIAKhIM (Russian: СССР-В6 Осоавиахим) was a semi-rigid airship designed by Italian engineer and airship designer Umberto Nobile and constructed as a part of the Soviet airship program. The airship was named after the Soviet organisation OSOAVIAKhIM. V6 was the largest airship built in the Soviet Union and one of the ...
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.
The Goodyear RS-1 was the first semi-rigid airship built in the United States. The dirigible was designed by chief aeronautical engineer and inventor, Herman Theodore Kraft of the Goodyear Tire and Rubber Company for the United States Army Air Service in the late 1920s. Goodyear built only one airship of this type.
During the 1930s, airships like the Hindenburg class were widely considered the future of air travel, [citation needed] and the lead ship of the class, LZ 129 Hindenburg, established a regular transatlantic service. The airship's destruction in a highly publicized accident was the end of these expectations.