|
|
| Line 5: |
Line 5: |
| It was developed in parallel with the [[21-in R.G.F. Mark I Torpedo|Mark I torpedo]], which was shorter at 18.5 feet. | | It was developed in parallel with the [[21-in R.G.F. Mark I Torpedo|Mark I torpedo]], which was shorter at 18.5 feet. |
|
| |
|
| ===Particulars=== | | ===Mark II=== |
| <!--
| |
| The final design's characteristics are detailed in the ''Annual Report of the Torpedo School, 1901''.{{ARTS1901|pp. 36-7}}
| |
| 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"
| |
| -->
| |
| | |
| ==Manufacture and Use==
| |
| In 1909-1910, 4 hook bracket torpedoes were ordered.{{CN}} | | In 1909-1910, 4 hook bracket torpedoes were ordered.{{CN}} |
|
| |
|
| <!--
| |
| ==Mark II*== | | ==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.{{ARTS1914|p. 9}} |
|
| |
|
| ==Mark II**== | | ==Mark II**== |
| -->
| | Introduced in 1914, these included the improvements of the II** and added three other small features.{{ARTS1914|p. 9}} |
| | |
| ==Footnotes== | | ==Footnotes== |
| {{reflist}} | | {{reflist}} |
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]
- ↑ Annual Report of the Torpedo School, 1909. Plate 1.
- ↑ Annual Report of the Torpedo School, 1914. p. 9.
- ↑ Annual Report of the Torpedo School, 1914. p. 9.
Bibliography
See Also
