18-in Mark III Torpedo (UK)

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The 18-in R.G.F. Mark III Torpedo was a British torpedo developed at the Royal Gun Factory in 1894.[Fact Check]

It may have been built in both long and short versions, but the short version is not clear.

Mark III

It carried a charge of 170 pounds, 15 ounces – about 18 punds less than the Mark II torpedo.[1]

In 1895, 56 were in service.

Manufacture and Use


In 60 degree water, 18-in H.B. torpedoes of Mark I* through IV were approved for the setting of 1,500 yards at 20.25 +/- 0.25 knots at 1,400 pounds pressure. The S.L.L.R. torpedoes of the same Marks did at 21.75 knots to 1,500 yards and the S.L.S.R. models 25.25 knots at 1,350 pounds pressure.[2]


12 of just 40 remaining torpedoes were broken up in 1918.[3]


In 1919, it was approved to break up all 18-in R.G.F. torpedoes Mark I* to Mark III.[4]


  1. Annual Report of the Torpedo School, 1895. p. 30.
  2. Principal Questions Dealt with by the Director of Naval Ordnance, 1905. pp. 440, 441.
  3. Annual Report of the Torpedo School, 1918. p. 10. (G. 8472/18).
  4. Annual Report of the Torpedo School, 1919. p. 11.


See Also