The firing pin design was taken from an earlier torpedo, its speed was 33 knots, the faster Mk 14 shattered the pin. Interestingly enough, against a stationary target, those torpedoes worked almost 100% of the time at all angles. But hitting a moving target apparently added a extra force not encountered during pre-war testing (which was all against stationary targets), and that was just enough to disable the torpedo. The firing pin should work good at the slower speed setting.
The magnetic influence would go off at random, mostly due to the difference of magnetic fields threw out the world.
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