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British 24.5-inch torpedo
Wrecked 24.5 inch Mark I torpedoes after HMS Nelson was torpedoed in 1941.jpg
Wrecked 24.5-inch Mark I torpedoes after HMS Nelson was torpedoed in 1941
Type Torpedo
Place of origin United Kingdom
Service history
In service 1925[1]
Used by Royal Navy
Production history
Designed 1923
Weight 5,700 pounds (2,600 kg)
Length 26 feet 7 inches (8.10 m)
Diameter 24.5 inches (62 cm)

Effective range 15,000 yards (14,000 m) at 35 knots (65 km/h)
20,000 yards (18,000 m) at 30 knots (56 km/h)
Warhead TNT
Warhead weight 743 pounds (337 kg)

Propellant Oxygen-enriched air
Speed 30 knots (56 km/h) - 35 knots (65 km/h)
Nelson-class battleships

The 24.5" Mark I torpedo was a British torpedo carried only on Nelson-class battleships. This was the type of torpedo that HMS Rodney fired at the German battleship Bismarck, "the only known occasion that a battleship fired torpedoes at an enemy battleship."[1]

This torpedo design was the inspiration for the Japanese Type 93 'Long Lance' torpedoes.[citation needed]


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