Type XXI submarines were a class of German diesel–electric Elektroboot (German: "electric boat") submarines designed during the Second World War. One hundred and eighteen were …

The Type 21 frigate, or Amazon-class frigate, was a British Royal Navy general-purpose escort that was designed in the late 1960s, built in the 1970s and served throughout the 1980s into …

21型巡防舰也称为亚马逊级巡防舰、女将级巡防舰，是英国皇家海军于1960年代晚期為取代豹级巡防舰而建造的护航巡防舰 [1] ，曾參與福克蘭戰爭 [2] ，在皇家海軍一直服役到1990年代，有 …

Type 21 can refer to: Type 21 frigate, or Amazon-class frigate, a late-20th-century escort vessel of the Royal Navy. Type 021-class missile boat, a Chinese missile-firing naval vessel first …

21型潜艇（又称：XXI型潜艇），是 德国 在 第二次世界大战 期间设计和使用的一型柴电潜艇。 21型潜艇是世界上第一艘真正意义上的的“潜”艇，以潜在水下巡逻和作战为宗旨 [1]。 其首次 …

With a new rapid reloading hydraulic system, the Type XXI could launch three six torpedo salvos or eighteen torpedoes in just under 20 minutes; whereas it took over ten minutes to reload just …

XXI級潛艇 （德語：Klasse XXI 、或稱 Typ XXI）是 納粹德國海軍 在 第二次世界大戰 後期使用的一級 潛艇，也是世上第一種完全為水下作戰設計、而非以往為攻擊和躲避水面艦攻擊才下潛 …

The Type 21 frigate, or Amazon-class frigate, was a Royal Navy general-purpose escort that was designed in the late 1960s, built in the 1970s and served throughout the 1980s into the 1990s. …

Type XXI U-boats, also known as " Elektroboote " (German: "electric boats"), were the first submarines designed to operate primarily submerged, rather than as surface ships that could …

2020年11月13日 · More than 250 feet long and displacing 1,620 tons, the Type XXI packed six hydraulically-reloaded torpedo tubes capable of firing more than 23 stored torpedoes. This …