Besides the depth problem the magnetic exploder was a total failure. What's bad about it is the Germans had tried an magnetic exploder before we got into the war and when they had problems with it immediately discontinued it. Admiral Christie was the one who tried to prevent further testing and commanded the sub fleet based in Australia. The subs based out of Pearl had been allowed to disable the magnetic feature and go with contact hits. After reports of repeated failures Pearl tested them and found that they ran deeper than set. Deep enough to run under a target. They next batch of subs that set the them to run shallow enough to hit reported multiple failures of the contact feature. But late 43 they pretty much had those problems fixed but Christie refused to allow his sub commanders to deactivate the magnetic feature. He had been key in the development of the torpedo. He didn't authorize deactivation of the magnetic feature until early 44. He clearly recklessly endangered his sub crews to protect his reputation. But because of the way the Pacific was split up he fell under Mac's command. Now I've seen nothing to make be believe that Mac knew anything about those problems or that he was involve in any way.
What I read about testing them was that it wasn't the cost but there was a shortage of torpedoes for a very long time after the war started. Many boats put to sea with less than a full load for the first year of the war. They were in short enough supply that the torpedoes used to test the depth settings were fired at a net so they could measure how deep they ran in a bay that was shallow enough to allow easy recovery of the torpedoes. Torpedoes were needed by cruisers, destroyers, PT boats, torpedo bombers and subs. The military was short or just about everything the first 2 years of the war.
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Today's Featured Article - Field Modifications (Sins of the Farmer) - by Staff. Picture a new Chevrolet driving down the street without it's grill, right fender and trunk lid. Imagine a crude hole made in the hood to accommodate a new taller air cleaner, the fender wells cut away to make way for larger tires, and half of a sliding glass door used to replace the windshield. Top that off with an old set of '36 Ford headlight shells bolted to the hood. Pretty unlikely for a car... but for a tractor, this is pretty normal. It seems that more often than not they a
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