1945-1991: Cold War world Wiki
Spearfish torpedo.
Category. Data.
Type. Conventional Cold War Torpedo.
Nationality. British.
Made in. 1988.
Retired. No, still in use.
Designer. GEC-Marconi Underwater Systems Ltd (now BAE Systems).
Manufacturer. GEC-Marconi Underwater Systems Ltd (now BAE Systems).
Variants. 1.
Diameter. 21 inches.
Speed. 80 kn (150 km/h).
Warhead. 300 kg (660 lb) aluminised (full of aluminium filings) PBX explosive.
Operational range. (Maximum range) 54 km (30 nmi).
Guidance system. Wire-guided with autonomous active terminal homing sonar.
Launch platform. Submarines.
Weight. N\A, but probably akin to those of comparable role, configuration and era.
Sources. https://www.wikiwand.com/en/British_21_inch_torpedo and https://www.wikiwand.com/en/Spearfish_torpedo