page_title: British 18-inch torpedo
section_title: Mark 30
hierarchical_section_title: British 18-inch torpedo / Mark 30
caption_attribution_description: English: A Mark 30 Torpedo at the RAF Museum in Hendon, London. Photo by Max Smith
context_page_description: There have been a number of 18-inch torpedoes in service with the United Kingdom.
  These have been used on ships of the Royal Navy and aircraft of both the Fleet Air Arm and Royal Air Force, while Royal Navy surface ships and submarines use 21-inch torpedoes.
  The British "18-inch" torpedoes were 17.72 inches in diameter, beginning with the "Fiume" Whitehead torpedo of 1890.
context_section_description: An air-dropped passive acoustic homing torpedo known as "Dealer" and "Dealer B". "Dealer" did not see service use, but its successor, "Dealer B" (the Mark 30 Mod 0), was issued from June 1954. Considered very successful, with approximately 1,200 being built, it served in both the Royal Navy and RAF until 1970. The Mark 30 Mod 1 had several improvements, but this program was cancelled in 1955 in favour of purchasing Mark 43 Mod 3 torpedoes from the US.
  Length: 8 ft (2.4 m)
  Weight: 646 lb (293 kg)
  Performance: 12.5 knots (23.2 km/h; 14.4 mph) for 3,000 yd (2,700 m) or 19 knots (35 km/h; 22 mph) for 830 yd (760 m)
caption: Mk 30 Torpedo
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