Fin-stabilizer

Japanese: fin-stabilizer(英語表記)finstabilizer
Fin-stabilizer

...Later, a device was invented that uses a different small gyroscope to detect the ship's rolling angular velocity, and uses the signal to force the main gyro into precession, thereby reducing the rolling effect of the main gyro. This device quickly became popular, but it is no longer used much today because the device itself takes up a large amount of space on board the ship and is expensive.
[Fin stabilizer]
A wing-shaped fin protrudes from the surface of the hull into the seawater on both sides of the curved left and right sides near the center of the hull. When the ship rolls while sailing, seawater flows in at the angle of attack of the fin, generating lift in a direction that counteracts the rolling motion.

*Some of the terminology that mentions "fin stabilizer" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…その後,別の小さなジャイロで船体の横揺れ角速度を検出し,その信号によって主ジャイロに強制的に歳差運動を起こさせて主ジャイロの減揺効果を生む装置が発明されて急速に普及したが,装置自身が船内において占める容積が大きく,かつ,装置が高価なため,現在ではあまり使用されていない。
[フィンスタビライザーfin‐stabilizer]
 船体中央付近の左右両玄湾曲部に,翼形のひれ(フィンfin)を船体表面から海水中に突き出させたもの。航走中に船が横揺れすると,ひれにある迎え角で海水が流入して,横揺れを妨げる方向の揚力が発生する。…

※「fin-stabilizer」について言及している用語解説の一部を掲載しています。

出典|株式会社平凡社世界大百科事典 第2版について | 情報

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