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R80 (airship)
The ''R80'' was a British rigid airship, first flown on 19 July 1920 and the first fully streamlined airship to be built in Britain. Originally a military project for the British Admiralty, she was completed for commercial passenger-carrying purposes. However, ''R80'' proved too small for this role, and after being briefly used to train the United States Navy personnel who were to crew the ill-fated ''ZR-2'' airship she was retired, eventually being scrapped in 1925.
==Development==
Construction was began by Vickers in their airship shed at Walney Island, Barrow-in-Furness, in November 1917 to a design by Barnes Wallis and H. B. Pratt. Vickers had originally contracted to build ''R37'', but due to a lack of vacant sheds and a war-time steel shortage preventing construction of a new larger one, the smaller shed at Walney was used instead. This had been used to build ''R27'' and ''R29'', and the size of the R80 was limited by the small size of the shed.
Work progressed slowly due to labour shortages, and with the end of the First World War, the future of military airships was reviewed. The Air Ministry stopped the work in the summer of 1919 as it was considered that the ship was no longer of military or commercial value. Vickers, however, continued to fit out the ship with commercial objectives in mind but the scheme unfortunately fell through. Co-designer H. B. Pratt completed a report envisaging an intercity European flight route, similar to that being run by the Zeppelin company:
"The route chosen to Rome is 1,000 land miles which is within the endurance of the ship. It is expected that the ship will fly at a maximum height of 2,000 ft. The route will carry the ship over south England, the over the English Channel to Paris on a direct route. The ship will then deliver mail and passengers, and then pass down in a continued south easterly direction towards Lyon. Passing over Lyon, the ship will turn south through the Rhone Valley and the continue to Nice. At Nice on the French Coast, the ship will turn easterly and skirt the coast and head towards Rome over the sea. The return course will be via the same route."
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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