The Mark IV torpedo was the principal British torpedo of World War I. Designed 1912, initially available 1915, adopted for service 1916. Used by destroyers, torpedo boats, and other surface ships equipped with 21-inch torpedo tubes, such as the Royal Sovereign-class battleships.

On 9 February 1945 the Royal Navy submarine HMS Venturer sank the German submarine U-864 with four Mark VIII** torpedoes. This is the only intentional wartime sinking of one submarine by another while both were submerged.

For example, the designation 21" Mark VIII** meant that this was the eighth torpedo developed in the 21 inch (53.3 cm) series and that it was to the second modification of the original design. All British 18" torpedoes had an actual diameter of 17.7" (45 cm).

On 9 February 1945 the Royal Navy submarine HMS Venturer sank the German submarine U-864 with four Mark VIII** torpedoes. This is the only intentional wartime sinking of one submarine by another while both were submerged.

Hoisting a 21" (53.3 cm) torpedo aboard HMS Ramillies. Note the torpedo trolley. Loading torpedoes on an unidentified battleship sometime during World War I. IWM photograph Q 17941.

The Mark VIII was the first burner-cycle torpedo in service. The principal World War II version was the Mark VIII** and this torpedo was used far more than any other British torpedo during the war. 3,732 were fired by September 1944, 56.4% of the total.

18 in. Mk.VII* UK: Destroyers, aircraft & torpedo boats/ surface: Diameter:17.7 in (450 mm) 330 lb (150 kg) TNT: Wet heater: ... 18 inch Mk.XV UK: 1943: Aircraft & ... Mark 21 Mod.2 US: Faichild Petrel/ ...

2024年10月8日 · On 9 February 1945 the Royal Navy submarine HMS Venturer sank the German submarine U-864 with four Mark VIII** torpedoes. This is the only intentional wartime sinking of one submarine by another while both were submerged.

波佛斯40公釐高射炮 （又名40快炮、40机炮或波佛斯炮）为 瑞典 波佛斯 （Bofors）所设计的 高射炮，是 二次世界大战 以来主要的中型地面防空武器之一，无论是 同盟国 或 轴心国 皆有直接采购或技转，甚至掳获使用。 在二战结束后亦继续改良，可说是中口径高射炮的代名词。 因有大量双、四联装版本，包括未授权仿制型，按火炮计算L/60型总产量超过6万门，按炮管数计算，总产量超过12万支。 波佛斯40高炮的研发滥觞源于1928年， 瑞典海军 不满意 诺典飞尔德速射炮 …

There have been a number of 21-inch torpedoes in service with the United States. These have been used on ships and submarines of the U.S. Navy. American 21-inch torpedoes are 533 millimeters (21 in) in diameter. Ship classes that carried 21-inch torpedoes include: 1976-?