21-in Mark IV Torpedo (UK)
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The 21-in R.N.T.F. Mark IV Torpedo was a British torpedo developed at the Royal Navy Torpedo Factory in 1915.[1]
Development and History
Fractures of 21-in Mark II*** Torpedoes in firings from Calliope at 29 knots indicated a need for a strengthened torpedo.[2] The first torpedoes tested tended to break surface on the range at Long Loch.
Mark IV
It differed from the Mark II*** in ten particulars, including a generally stronger form, tail fittings similar to G.S. 1 as fitted in the 18-in Marks VIII and VIII*, a tappet engine and injection oil which it was hoped might deliver 12,500 yards range.[3]
Footnotes
Bibliography
