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British 21 inch torpedo
There have been several British 21-inch (533 mm) diameter torpedoes used by the Royal Navy since their first development just before the First World War.
The 21-inch was the largest size of torpedo in common use in the RN. They were used by surface ships and submarines rather than aircraft which used smaller 18 inch torpedoes.
== 21 inch Mark I ==
The first British 21 inch torpedo came in two lengths "Short" at 17 ft 10.5 in (5.45 m), and "Long" at 23 ft 1.25 in (7.04 m). The explosive charge was 200 lb of gun cotton increased later to 225 lb.
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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