In response to the question about how the wire plays out from the tube IRL, it works as follows. The torpedo itself has a certain amount of guidance wire internal to the weapon, and inside the tube is a guidance wire dispenser with about 1/2 the amount of what is in the torpedo fuel tank.
After launch, once the wire achieves 'equilibrium' the torpedo will feed out as much wire as necessary to account for its own motion, and the wire dispenser in the tube will pay out enough to account for O/S motion. In theory the center of the wire is stationary. The reason there is less wire in the tube than there is in the torpedo fuel tank is the fact that the torpedo moves at roughly twice the speed O/S does.
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