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Roma (airship)
''Roma'' was an Italian semi-rigid airship, originally designated the T-34. It was purchased by the United States from the Italian government for $250,000 in 1921. It served in the US Army until February 21, 1922, when it crashed in Norfolk, Virginia, killing 34 people. It was the last hydrogen filled airship used by the US; all future ships were filled with helium.
==Design and development==
The Roma was designed by Celestino Usuelli, the engineers Eugenio Prassone, Umberto Nobile and Colonel Gaetano Arturo Crocco.〔Flight (1920)〕 It was the first project of the ''Stabilimento Costruzioni Aeronautiche'' ("Aeronautical Construction Factory"), as the partnership of Umberto Nobile, Usuelli, Giuseppe Valle and Bennetto Croce was known. The T-34 was designed for trans-Atlantic crossings. It was the largest semi-rigid airship in the world.
As a semi-rigid design it was built about a rigid keel - though the keel was partially articulated to allow some flexibility. The passenger spaces and control cabin were within the keel. The engines, 400 hp Ansaldos were mounted outside, angled such that the slipstreams would not interfere with each other.
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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