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Semi-rigid airship

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Goodyear Semi-Rigid Airship "Wingfoot One" Visits Dutchess Co Airport (KPOU)

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WingFoot 2, N2A, Goodyear Semi Rigid Airship (not a Blimp) over LA Live

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AEROSCRAFT How It Works World's Most Advanced Airship Commercial CARJAM TV 2014

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AEROSCRAFT World's Most Advanced AIRSHIP First Flight Commercial CARJAM TV 2014

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World's Most Advanced Air Ship

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 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 design was revived by the Zeppelin NT in 1997.
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