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torpedo boat : ウィキペディア英語版
torpedo boat

A torpedo boat is a relatively small and fast naval ship designed to carry torpedoes into battle. The first designs rammed enemy ships with explosive spar torpedoes, and later designs launched self-propelled Whitehead torpedoes. They were created to counter battleships and other large, slow and heavily armed ships by speed and agility. A number of inexpensive boats attacking en masse could overwhelm a larger ship's ability to fight them off using its large, slow-firing guns. This way an inexpensive fleet of torpedo boats could defend against much larger and more expensive fleets, albeit only in the coastal areas to which their small size and limited fuel load restricted them.
The introduction of fast torpedo boats in the late 19th century was a serious concern to navies of the era. In response, navies operating large ships introduced smaller ships to counter the threat. Initially these were somewhat larger than the torpedo boats they faced, and mounted a light gun battery as well as (in most navies) torpedoes. As these designs became more formalized, they became known as "torpedo boat destroyers", and eventually evolved into the modern destroyer.
Torpedo boats evolved over time, notably with the addition of guided missiles. Today the class is generally known as "fast attack craft".
==Spar torpedo boats==

The American Civil War saw a number of innovations in naval warfare, including an early type of torpedo boat, armed with spar torpedoes. In 1861 President Lincoln instituted a naval blockade of Southern ports, which crippled the South's efforts to obtain war materials from abroad. The South also lacked the means to construct a naval fleet capable of taking on the Union Navy on even terms. One strategy to counter the blockade saw the development of torpedo boats, small fast boats designed to attack the larger capital ships of the blockading fleet as a form of asymmetrical warfare.
The ''David'' class of torpedo boats were steam powered with a partially enclosed hull. They were not true submarines but were ''semi-submersible''; when ballasted, only the smokestack and few inches of the hull were above the water line. The CSS ''Midge'' and CSS ''St. Patrick'' were ''David''-class torpedo boats. The CSS ''Squib'' and represented another class of torpedo boats that were also low built but had open decks and lacked the ballasting tanks found on the ''David''s.
The Confederate torpedo boats were armed with spar torpedoes. This was a charge of powder in a waterproof case, mounted to the bow of the torpedo boat below the water line on a long spar. The torpedo boat attacked by ramming her intended target, which stuck the torpedo to the target ship by means of a barb on the front of the torpedo. The torpedo boat would back away to a safe distance and detonate the torpedo, usually by means of a long cord attached to a trigger.
In general, the Confederate torpedo boats were not very successful. Their low sides made them susceptible to swamping in high seas, and even to having their boiler fires extinguished by spray from their own torpedo explosions. Torpedo misfires (too early) and duds were common.
In 1864 Union Naval Lieutenant Cushing fitted a steam launch with a spar torpedo to attack the Confederate ironclad . Also the same year the Union launched the , a purpose-built craft with a number of technical innovations including variable ballast for attack operations and an extensible and reloadable torpedo placement spar.

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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