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Current Order No. 69 - Issued March 1945 |
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(With reference to the firing of torpedoes by Radar) - O.T. torpedo |
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| Torpedoes fired below periscope depth using Radar as a means of sighting |
1) Radar directed torpedoes are fired from a U-boat submerged to a maximum depth of 40 metres. O.T. fire is forbidden beyond this depth. |
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2) Instructions regarding the firing of torpedoes without the use of a periscope are contained in Current Order No. 67, and these remain valid. |
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3) The O.T. torpedo is not available at the moment for U-boats Type Rom. 21. If the results of the current trials are satisfactory, permission will be granted for its use, gradually up to a depth of 50 meters. |
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4) O.T. torpedoes can be used by U-boats with piston tubes (Types VII, IX, IXD, XXIII) |
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a) Air cartridge filling in kilograms Square centimeters necessary for boats with bronze piston tubes at a maximum depth of 35 meters: |
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| For surface firing, quantity equals |
11 Kg. |
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| At a depth of 10-12 metres " |
17 Kg. |
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| " " " " 12-17 " " |
17 Kg. |
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| " " " " 17-22 " " |
22 Kg. |
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For depths of 22-35 meters, the filling quantity corresponds to the actual depth in meters. Fluctuations in depth of plus of minus 3 meters are permissible without changing the air cartridge pressure. Plus or minus 3 degrees beyond the buoyancy limits is allowable, for bow and stern tubes. Stop pressure in air cartridges must be adjusted to 5 Kg. at 22. |
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b) Boats with steel piston tubes at a maximum depth of 40 metres. (Air cartridge fillings up to 22 metres in depth as in "a"). For depth of 22-40 metres air cartridge fillings should correspond to the actual depths in metres. (Otherwise as in "a") |
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Translated by C/W Watson |
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C/W Robertson |
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