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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 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]
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.
The airship was designed by Goodyear engineer and inventor, Herman Theodore Kraft who consulted with noted Italian semi-rigid airship designer, Colonel Umberto Nobile. Components for the dirigible were shipped to Scott Field, Illinois for assembly in the base's 810 foot airship hangar in early 1925. [1]