Difference between revisions of "21-in Mark IV Torpedo (UK)"
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==Mark IV== | ==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.{{ARTS1915|p. 37}} | 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.{{ARTS1915|p. 37}} | ||
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| + | In May, 1918, the torpedo was noted as having the following settings at a charge of 2650 pounds per square inch, though each torpedo would have either the 35 or 44.5 knot setting, but not both:{{GFGTO|p. 16}} | ||
| + | * 44.5 knots to 4500 yards (High Speed) | ||
| + | * 35 knots to 6000 yards (High Speed) | ||
| + | * 25 knots to 15,000 yards (Medium Speed) | ||
| + | * 21 knots to 18,000 yards (E.R.) | ||
| + | |||
| + | The 2650 psi pressure was the "action" pressure; normal was 2500. Ranges were 300 yards less at 44.5 knots and 1,000 yards less at lower speeds at the normal pressure. A 2000 psi charge gave reduced the 44.5 knot setting to 3,000 yards at 43.75 knots. | ||
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| + | ==Mark IV*== | ||
| + | In May, 1918, the torpedo was noted as having the following settings at a charge of 2650 pounds per square inch, though each torpedo would have either the 35 or 44.5 knot setting, but not both:{{GFGTO|p. 16}} | ||
| + | * 44.5 knots to 4500 yards (High Speed) | ||
| + | * 35 knots to 6000 yards (High Speed) | ||
| + | * 29 knots to 11,000 yards (Medium Speed) | ||
| + | * 25 knots to 15,000 yards (Medium Speed) | ||
| + | * 21 knots to 18,000 yards (E.R.) | ||
| + | |||
| + | The 2650 psi pressure was the "action" pressure; normal was 2500. Ranges were 300 yards less at 44.5 knots and 1,000 yards less at lower speeds at the normal pressure. | ||
==Footnotes== | ==Footnotes== | ||
Revision as of 15:28, 2 May 2013
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]
In May, 1918, the torpedo was noted as having the following settings at a charge of 2650 pounds per square inch, though each torpedo would have either the 35 or 44.5 knot setting, but not both:[4]
- 44.5 knots to 4500 yards (High Speed)
- 35 knots to 6000 yards (High Speed)
- 25 knots to 15,000 yards (Medium Speed)
- 21 knots to 18,000 yards (E.R.)
The 2650 psi pressure was the "action" pressure; normal was 2500. Ranges were 300 yards less at 44.5 knots and 1,000 yards less at lower speeds at the normal pressure. A 2000 psi charge gave reduced the 44.5 knot setting to 3,000 yards at 43.75 knots.
Mark IV*
In May, 1918, the torpedo was noted as having the following settings at a charge of 2650 pounds per square inch, though each torpedo would have either the 35 or 44.5 knot setting, but not both:[5]
- 44.5 knots to 4500 yards (High Speed)
- 35 knots to 6000 yards (High Speed)
- 29 knots to 11,000 yards (Medium Speed)
- 25 knots to 15,000 yards (Medium Speed)
- 21 knots to 18,000 yards (E.R.)
The 2650 psi pressure was the "action" pressure; normal was 2500. Ranges were 300 yards less at 44.5 knots and 1,000 yards less at lower speeds at the normal pressure.
Footnotes
Bibliography
