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is questionable whether the torpedo will not break the surface if it is fired from a tube at 10 meters depth (depth of discharge tube when boat is submerged) with a depth setting of 2 meters, and what happens if the boat is down by the stern, which is not always avoidable when firing? A surface runner, by day at least, is even more dangerous for the boat than a premature detonator. On the other hand everything possible must be tried to eliminate under-firing. I therefore, ordered U 30 to fire 2 test shots immediately from periscope depth with electric torpedoes, with a depth setting of 2 meters, one with the boat on an even keel, the other 30 stern heavy, and to report the result, giving the seaway. The result was satisfactory, neither of the torpedoes broke the surface in a head sea 3. I therefore gave the following order for depth setting of torpedoes: Radio message 0103/21/4: |
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In "MZ" shots, depth to equal draft minus 1 meter, against destroyers, submarines and steamers under 4,000 tons: depth 3 meters, in good weather 2 meters. For "AZ": depth 3 meters against all targets, 2 meters in good weather. |
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The torpedoes fired by U 47 at "Warspite" on 19.4 which failed to detonate, are still unexplained. I think it improbable that, with a depth setting of 8 meters, the torpedoes could have run under the firing field of a battleship, even if they actually kept a depth of 11 or even 12 meters. |
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If these shots were not misses (which is highly unlikely in view of the commander's unmistakable report of failure to explode and the short range of 900 meters and a double shot), then it must be assumed that there was a degaussing effect. |
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I consulted Professor Cornelius and Professor Gerlach by telephone and they consider that it would be extraordinarily difficult to fit D.G. gear in battleships and that it is therefore very unlikely in such ships at present. |
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I am not quite convinced. We have definite information that the English have fitted many of their merchant ships with D.G. gear for sometime past. They will attach the greatest importance to the protection of their most valuable ships and make every effort to achieve it. But for the few cases where a boat manages to fire at a large warship I would like, as far as lies in my power, to exclude the smallest chance of failure. I therefore ordered, at midday on 21.4 a depth setting of 5 meters for shots at battleships. Then, even if the torpedo runs 3 meters deeper, i.e., at 8 meters, impact firing may still take effect. At the same time I restricted the use of the 2 meter shot to the G7e, as, with the G7a, there is still the danger of surface-runners. During the last few days the boats have been overwhelmed with a large number of orders on the use of torpedoes, type of firing unit and depth-setting. Resetting the pistols always means long re-loading jobs, which cannot always be carried out. THe commanding officers are burdened and restricted by the frequent contradictory orders. |
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I was forced to give these orders because of the constant fresh failures and the conclusions drawn therefrom, but, above all, by the almost daily new discoveries made by the Torpedo Inspectorate of the defects of their torpedo. It now appears that the Torpedo Inspectorate had no reliable information on any aspect of the G7e. |
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I had to do everything possible to prevent further failures when the causes of failure became known and especially to prevent as far as possible unjustifiable risk of the boats. |
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