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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 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.
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.
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 airship's three ballonets were equipped with Sirocco system fans, powered by separate gasoline engines. The gondola of the "Giant" stretched along the entire length of the airship and was rigidly attached to its frame. A unique feature of the design was that the gondola was covered in fabric, forming a single structure with the envelope. [1]
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.
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.
Nulli Secundus II being walked out of its shed. Following proposals for a new airship, it was decided to re-use the envelope of the first airship, which was enlarged to a capacity of 84,768 ft. [7] [8] New features included a silk outer skin over the whole structure, a new and revised understructure, a small additional "reserve" gasbag in the space in between, modified control surfaces ...