21-in Mark II Torpedo (UK)
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R.G.F. Torpedoes Mark I and II, 1909[1]
The 21-in R.G.F. Mark II Torpedo was a British torpedo developed at the Royal Gun Factory and first ordered for service in 1909-1910.[Citation needed]
Development and History
It was developed in parallel with the Mark I torpedo, which was shorter at 18.5 feet.
Mark II
In 1909-1910, 4 hook bracket torpedoes were ordered.[Citation needed]
Mark II*
Introduced in 1914, these featured rectified threads throughout, air vessel pressures of 2,350 psi for 10,750 yard range and two other improvements.[2]
Mark II**
Introduced in 1914, these included the improvements of the II** and added three other small features.[3]
Footnotes
Bibliography
