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21 inch Mark XI torpedo.
Category. Data.
Type. Conventional WW2 torpedo.
Nationality. British.
Made in. WW2.
Retired. Late 1940s.
Designer. N\A.
Manufacturer. N\A.
Variants. None.
Diameter. 21 inches.
Speed. N\A, but probably typical for it's time and class.
Warhead. TNT.
Operational range. N\A.
Guidance system. N\A.
Launch platform. Destroyers.
Weight. N\A, but probably akin to those of comparable role, configuration and era.
Sources. https://www.wikiwand.com/en/British_21_inch_torpedo.

There have been several British 21-inch (533 mm) diameter torpedoes used by the Royal Navy since their first development just before the First World War.

The 21-inch was the largest size of torpedo in common use in the RN. They were used by surface ships and submarines rather than aircraft which used smaller 18 inch torpedoes.

Electric battery powered torpedo with a 322 kg (710 lb) TNT warhead. Entering service during the Second World War it was used by destroyers.

A few served for a few years after WW2 in the French and Australian navies.