US Navy doctorine was not compatible with spreads like the German U-boats. They lacked the equipment for one, but it was probably an obvious idea to have pre programmed spreads that launch at once that they decided against. My understanding is that torpedos launched together was thought to be too risky. One could set off the other during travel or impact so there was some minimum seperation mandated.
The "Gryo Fudge Factor" dial is curious since I don't know exactly when its position matters and when it doesn't when firing. Set value, hit fire, and the dial doesn't effect the torpedo any more? I am always nervous that changing that dial between hitting the launch button and the torpedo leaving the tube might have an adverse effect.
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