| 41. | "Norge " was the first N class semi-rigid airship designed by Umberto Nobile and its construction started in 1923.
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| 42. | Despite this setback, the US Navy continued with its rigid airship programme, starting construction of ZR-1 in June 1922.
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| 43. | The US Army continued to show interest in the acquisition and operation of rigid airships well into the 1930s.
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| 44. | The first British rigid airship to fly, it was ordered in 1913 but did not fly until 27 November 1916.
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| 45. | The incident shattered public confidence in the giant, passenger-carrying rigid airship and marked the abrupt end of the airship era.
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| 46. | In 1917, Clark became a NACA member, and a member on the Joint Army and Navy Board on Rigid Airships.
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| 47. | During World War I the Joint Airship Board assigned the US Navy the role of acquiring and developing rigid airships.
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| 48. | It was a small non-rigid airship with a top speed under 20 mph and an endurance of just over 2 hours.
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| 49. | The British rigid airship program, which had mainly been a reaction to the potential threat of the German airships, was wound down.
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| 50. | The main types of airship are Count Zeppelin and the vast majority of rigid airships built were manufactured by the firm he founded.
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