The Astra-Torres airships were non-rigid airships built by Société Astra in France between about 1908 and 1922 to a design by the Spaniard Leonardo Torres Quevedo. They had a highly characteristic tri-lobed cross-section rather than the more usual circular cross-section. This was the result of moving most of the blimp's bracing wires inside the envelope in an attempt to minimise drag. Early Astra-Torres airships could be trimmed by moving the entire gondola fore and aft.
Astra-Torres airships, like Alsace, were used by the French Navy during the First World War and for a few years before and after. A few of these were transferred to the American expeditionary forces in Europe, and AT-1, AT-13 and AT-17 were eventually taken back to the United States.
Britain's Royal Naval Air Service purchased AT-14, AT-17 and AT-19, these becoming HMA No. 3, HMA No. 8 and HMA No. 16 respectively. They went through testing and evaluation at RNAS Kingsnorth before all were later taken out of service in May 1916, although the Astra-Torres design was imitated in Britain's own Coastal class, and North Sea blimps that served through to the end of the war.
After the war, AT-16 was operated by Transaérienne, carrying sightseeing passengers over Paris, and AT-24 was purchased by the Japanese Navy.
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