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No. 9r
HMA ''No. 9r'' was a rigid airship designed and built by Vickers at Walney Island just off Barrow-in-Furness, Cumbria. The first British rigid airship to fly, it was ordered in 1913 but did not fly until 27 November 1916. It was dismantled in June 1918, after being flown for around 165 hours, mainly for experimental purposes.〔Higham 1961, p. 131〕
==Background==
Plans to build a second rigid airship to follow the unsuccessful HMA No. 1 (His Majesty's Airship No. 1) ''Mayfly'' were agreed by the Committee for Imperial Defence in early 1913〔Higham 1961, p. 65〕 Vickers' airship design department had been disbanded following the failure of the ''Mayfly'': consequently a new department had to be formed. H. B. Pratt was recruited as chief designer: he had been working at Vickers while the ''Mayfly'' was being constructed and had predicted that it was not structurally sound. He subsequently left the company. Pratt in turn hired Barnes Wallis, who he had met while both were working for J. Samuel White, as his assistant.〔Higham 1961, p.125〕
The initial order for the new ship was placed on 10 June 1913, with the final plans being agreed at the end of the year, and a formal contract was signed in March 1914.〔(【引用サイトリンク】publisher= Airship Heritage Trust )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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