Difference between revisions of "18-in Mark IV Torpedo (UK)"
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The '''18-in R.G.F. Mark IV Torpedo''' was a British torpedo developed at the [[Royal Gun Factory]] in 1894 or 1895.{{FC}}{{ARTS1893|p. 52}} | The '''18-in R.G.F. Mark IV Torpedo''' was a British torpedo developed at the [[Royal Gun Factory]] in 1894 or 1895.{{FC}}{{ARTS1893|p. 52}} | ||
− | + | ==Development and History== | |
− | + | In 1895, they were just about to enter service. | |
− | + | ||
− | + | ===Particulars=== | |
+ | The final design is extensively laid out in the ''Annual Report of the Torpedo School, 1895''.{{ARTS1895|pp. 30, 37-40, Plate 7}} | ||
+ | |||
+ | The construction was very similar in materials to the 14-in Mark IX torpedo. | ||
+ | |||
+ | * Diameter: 17.71 inches | ||
+ | * Length: 16 feet, 7.4 inches | ||
+ | * Weight with pistol, without air: 1,156 pounds | ||
+ | * Metacentric height: at least .575 inches | ||
+ | * C.G. distance from tip of shaft, no air: 114.175 inches | ||
+ | * C.G. distance from tip of shaft, 60 pounds air: 114.35 inches | ||
+ | * Warhead: 200 pounds wet guncotton | ||
+ | It carried a charge of 170 pounds, 15 ounces – the same as in the [[18-in R.G.F. Mark III Torpedo|Mark III torpedo]]. | ||
+ | |||
+ | It had a Brotherhood engine of 3.25x3 inches. | ||
+ | |||
+ | Mean pitch of propellors was 40 inches. When charged with air, the torpedo must pass through a gauge 9 inches long and 17.725 inches internal diameter. | ||
+ | |||
+ | With pistol and charged with 60 pounds of air was ballasted and adjusted to float horizontally and upright in salt water at a density of 1.026 and 60 degree temperature. In fresh water, with pistol and no air, it had a buoyancy of 31 pounds. | ||
+ | |||
+ | The proof and passing tests were six runs when charged to 1,350 psi: | ||
+ | * two runs from a submerged frame at target 800 yards distant | ||
+ | * two runs from an A.W. tube at least four feet above the water at a target 400 yards away | ||
+ | * one run above water at target 800 yards away | ||
+ | * one run from submerged frame at target 800 yards away | ||
+ | |||
+ | The limits of deviation permitted were: | ||
+ | * lateral deviation from the submerged frame must be less than 12 yards either way throughout run | ||
+ | * from A.W. tube, lateral deviation of 8 yards at 400 yards or 24 yards at 600 yards | ||
+ | * deviation from set depth not to exceed +/- 18 inches | ||
+ | |||
+ | The speeds required were: | ||
+ | * not less than 30 knots to 600 yards and 29 knots to 800 yards in 60 degrees and warmer | ||
+ | * not less than 29.5 knots to 600 yards and 28.5 to 800 yards in 50-60 degrees | ||
+ | * at least 29 knots to 600 yards and 28 knots to 800 yards in water colder than 50 degrees | ||
+ | |||
+ | Endurance was tested in just one torpedo in a batch of twenty, after passing the above tests: | ||
+ | # make six short runs from above water gun 10 feet or more above water | ||
+ | # be fired from submerged frame and pass within 14 yards of target at 800 yards | ||
+ | # it must then "shew no signs of weakness or distortion" | ||
==Footnotes== | ==Footnotes== | ||
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==See Also== | ==See Also== | ||
+ | * [[14-in R.G.F. Mark IX Torpedo]], its contemporary | ||
{{CatTorpedo|18-in|UK}} | {{CatTorpedo|18-in|UK}} |
Revision as of 12:08, 25 November 2012
The 18-in R.G.F. Mark IV Torpedo was a British torpedo developed at the Royal Gun Factory in 1894 or 1895.[Fact Check][1]
Development and History
In 1895, they were just about to enter service.
Particulars
The final design is extensively laid out in the Annual Report of the Torpedo School, 1895.[2]
The construction was very similar in materials to the 14-in Mark IX torpedo.
- Diameter: 17.71 inches
- Length: 16 feet, 7.4 inches
- Weight with pistol, without air: 1,156 pounds
- Metacentric height: at least .575 inches
- C.G. distance from tip of shaft, no air: 114.175 inches
- C.G. distance from tip of shaft, 60 pounds air: 114.35 inches
- Warhead: 200 pounds wet guncotton
It carried a charge of 170 pounds, 15 ounces – the same as in the Mark III torpedo.
It had a Brotherhood engine of 3.25x3 inches.
Mean pitch of propellors was 40 inches. When charged with air, the torpedo must pass through a gauge 9 inches long and 17.725 inches internal diameter.
With pistol and charged with 60 pounds of air was ballasted and adjusted to float horizontally and upright in salt water at a density of 1.026 and 60 degree temperature. In fresh water, with pistol and no air, it had a buoyancy of 31 pounds.
The proof and passing tests were six runs when charged to 1,350 psi:
- two runs from a submerged frame at target 800 yards distant
- two runs from an A.W. tube at least four feet above the water at a target 400 yards away
- one run above water at target 800 yards away
- one run from submerged frame at target 800 yards away
The limits of deviation permitted were:
- lateral deviation from the submerged frame must be less than 12 yards either way throughout run
- from A.W. tube, lateral deviation of 8 yards at 400 yards or 24 yards at 600 yards
- deviation from set depth not to exceed +/- 18 inches
The speeds required were:
- not less than 30 knots to 600 yards and 29 knots to 800 yards in 60 degrees and warmer
- not less than 29.5 knots to 600 yards and 28.5 to 800 yards in 50-60 degrees
- at least 29 knots to 600 yards and 28 knots to 800 yards in water colder than 50 degrees
Endurance was tested in just one torpedo in a batch of twenty, after passing the above tests:
- make six short runs from above water gun 10 feet or more above water
- be fired from submerged frame and pass within 14 yards of target at 800 yards
- it must then "shew no signs of weakness or distortion"
Footnotes
- ↑ Annual Report of the Torpedo School, 1893. p. 52.
- ↑ Annual Report of the Torpedo School, 1895. pp. 30, 37-40, Plate 7.
Bibliography
See Also
- 14-in R.G.F. Mark IX Torpedo, its contemporary