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Torpedo belt
The torpedo belt was part of the armouring scheme in some warships of between the 1920s and 1940s. It consisted of a series of lightly armoured compartments, extending laterally along a narrow belt that intersected the ship's waterline. In theory, this belt would absorb the explosions from torpedoes and thus minimize internal damage to the ship itself.
Torpedo belts are also known as Side Protection Systems or SPS, or Torpedo Defense System or TDS.
==The problem==
Armoured warships (dreadnought battleships, armoured cruisers and later light and heavy cruisers) of the early 20th century carried their main protective armour above the waterline – the "main belt" – which was intended to stop flat-trajectory gunfire from piercing the hull. Below the belt, the armour generally tapered away, to reduce overall weight. This, however, makes a ship vulnerable to hits below the waterline from torpedoes; and the occasional large-calibre shell. Extending the belt downwards is impractical, since this increases displacement and draft, reducing speed and seaworthiness.
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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