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| | [[File:ARTS1909Plate1.jpg|thumb|600px|'''R.G.F. Torpedoes Mark I and II, 1909'''{{ARTS1909|Plate 1}}]] | | [[File:ARTS1909Plate1.jpg|thumb|600px|'''R.G.F. Torpedoes Mark I and II, 1909'''{{ARTS1909|Plate 1}}]] |
| − | [[File:ARTS1909Plate13.jpg|thumb|600px|'''R.G.F. Mark I Torpedo (bottom)'''{{ARTS1909|Plate 13}}]]
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| | The '''21-in R.G.F. Mark I Torpedo''' was a British torpedo developed at the [[Royal Gun Factory]]. | | The '''21-in R.G.F. Mark I Torpedo''' was a British torpedo developed at the [[Royal Gun Factory]]. |
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| | It was developed in parallel with the Mark II torpedo, which was longer.{{CN}} | | It was developed in parallel with the Mark II torpedo, which was longer.{{CN}} |
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| − | ===Particulars===
| + | The [[Beagle Class Destroyer (1909)|''Beagle'' class]] destroyers of the {{UK-DF|3}} were the first ships to carry this weapon, being equipped in 1912.{{ARTS1912|p. 36}} |
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| | + | ===Mark I=== |
| | Its overall length including 4.5-in long pistol was 17 feet, 10.5 inches (see Plate), identical to the [[21-in Weymouth Mark I Torpedo|Weymouth Mark I]].{{ARTS1908|p. 18}} | | Its overall length including 4.5-in long pistol was 17 feet, 10.5 inches (see Plate), identical to the [[21-in Weymouth Mark I Torpedo|Weymouth Mark I]].{{ARTS1908|p. 18}} |
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| − | The final design's characteristics are detailed in the ''Annual Report of the Torpedo School, 1901''.{{ARTS1901|pp. 36-7}}
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| − | The construction was very similar in materials to the 14-in Mark IX torpedo.
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| − | * Diameter: 17.71 inches
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| − | * Length: 16 feet, 7.4 inches
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| − | * Weight with pistol, without air: 1,156 pounds
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| − | * Metacentric height: at least .575 inches
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| − | * C.G. distance from tip of shaft, no air: 114.175 inches
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| − | * C.G. distance from tip of shaft, 60 pounds air: 114.35 inches
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| − | * Warhead: 200 pounds wet guncotton
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| − | 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]].
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| − | It had a Brotherhood engine of 3.25x3 inches.
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| − | 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.
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| − | 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.
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| − | The proof and passing tests were six runs when charged to 1,350 psi:
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| − | * two runs from a submerged frame at target 800 yards distant
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| − | * two runs from an A.W. tube at least four feet above the water at a target 400 yards away
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| − | * one run above water at target 800 yards away
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| − | * one run from submerged frame at target 800 yards away
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| − | The limits of deviation permitted were:
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| − | * lateral deviation from the submerged frame must be less than 12 yards either way throughout run
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| − | * from A.W. tube, lateral deviation of 8 yards at 400 yards or 24 yards at 600 yards
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| − | * deviation from set depth not to exceed +/- 18 inches
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| − | The speeds required were:
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| − | * not less than 30 knots to 600 yards and 29 knots to 800 yards in 60 degrees and warmer
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| − | * not less than 29.5 knots to 600 yards and 28.5 to 800 yards in 50-60 degrees
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| − | * at least 29 knots to 600 yards and 28 knots to 800 yards in water colder than 50 degrees
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| − | Endurance was tested in just one torpedo in a batch of twenty, after passing the above tests:
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| − | # make six short runs from above water gun 10 feet or more above water
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| − | # be fired from submerged frame and pass within 14 yards of target at 800 yards
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| − | # it must then "shew no signs of weakness or distortion"
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| | ==Manufacture and Use== | | ==Manufacture and Use== |
| | In 1909-1910, 66 side lug torpedoes were ordered.{{CN}} | | In 1909-1910, 66 side lug torpedoes were ordered.{{CN}} |
R.G.F. Torpedoes Mark I and II, 1909[1] The 21-in R.G.F. Mark I Torpedo was a British torpedo developed at the Royal Gun Factory.
Two experimental torpedoes were ordered for testing in 1908-09.[2]
They were first ordered for service in 1909-1910.[Citation needed]
Development and History
It was developed in parallel with the Mark II torpedo, which was longer.[Citation needed]
The Beagle class destroyers of the Third Destroyer Flotilla were the first ships to carry this weapon, being equipped in 1912.[3]
Mark I
Its overall length including 4.5-in long pistol was 17 feet, 10.5 inches (see Plate), identical to the Weymouth Mark I.[4]
Manufacture and Use
In 1909-1910, 66 side lug torpedoes were ordered.[Citation needed]
- ↑ Annual Report of the Torpedo School, 1909. Plate 1.
- ↑ Annual Report of the Torpedo School, 1908. p. 7.
- ↑ Annual Report of the Torpedo School, 1912. p. 36.
- ↑ Annual Report of the Torpedo School, 1908. p. 18.
Bibliography
See Also
