There have been a number of 21-inch torpedoes in service with the Royal Navy of the United Kingdom.
A Mark IV torpedo being hoisted onto HMS Monarch, an Orion-class battleship, during the First World War.
Launch of a Mark VII torpedo from HMAS Australia, during trials in 1927.
A Mark 20 torpedo exhibit at the Clandestine Immigration and Naval Museum, Haifa, Israel.
A Mark 23 torpedo repainted as an advertisement in front of The Ancient Mariner restaurant in Lynmouth, United Kingdom.
A torpedo is an underwater ranged weapon launched above or below the water surface, self-propelled towards a target, with an explosive warhead designed to detonate either on contact with or in proximi
British 21-inch torpedo
…There have been a number of 21-inch (53.3 cm) torpedoes in service with the Royal Navy of the United Kingdom. Torpedoes of 21-inch calibre were the largest torpedoes in common use in the RN. They were used…
Bliss–Leavitt Mark 8 torpedo
Confederates laying naval mines in Charleston Harbor