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Autolycus (submarine detector)
Autolycus was a method for detecting submerged submarines from aircraft. It attempted to detect exhaust fumes from their diesel engines.〔 It was developed by the British during the early Cold War period. The first version of Autolycus was deployed on Shackleton aircraft in the mid-1950s, with an improved version re-appearing in the mid-1960s.〔
== Submarines ==
During WWII, the first submarine snorkels came into service. These allowed diesel submarines to operate near the surface, using their diesel engines, and without being seen by surface search radar. Designs such as the German type XXI U-boat were the first submarines designed to operate ''primarily'' submerged, rather than as submersibles that navigated on the surface and could submerge as a means to escape detection or launch an attack. After WWII, this emphasis on submerged operation, battery capacity and higher submerged speed continued. In the US, the GUPPY program rebuilt wartime submarines to emphasise this. New Soviet Union submarines, primarily of the ''Whiskey'' class, were based on the four Type XXIs that were assigned to them by the Potsdam Agreement.
In the 1950s, the Fleet Air Arm were patrolling the North Sea and the GIUK gap for patrol and potentially anti-submarine warfare in search of Whiskey, Zulu and Foxtrot submarines. Patrol aircraft operated from RAF Ballykelly in Northern Ireland.〔 A means was needed for the initial detection of submarines in the area. Once detected, other methods such as radar or sonobuoy hydrophones could be used to track and target the contact.
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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