Calculating and doing the math for a torpedo attack - it’s easy to pause a game and do the geometry on the computer screen, but on which pad captain or officers drew their lines and angles?
There is a navigational plot somewhere on the sub which is used to track own ship and designated targets. There are various instruments and charts to help with the task, as well as transmitters for ranges and bearings. This was quite important job and closely tied with accurate estimates of target's course and speed. I belive some submarine captains preferred to work here.
Torpedo Data Computer - how does this thing work? Manually input the critical values, flip the swich and you just get the correct answer or what?
The inputs concerning own ship were automatic (i.e. had automatic follow-up). Target information (course, speed, bearing, range and length) was inputted manually. On US subs this resulted in a continuous generated solution that predicted where the target was in relation to own ship at any given time, provided the target kept stable course and speed (the sub itself could change course and speed, or dive deeper, without ruining the solution). The prediction of the generated solution was visually indicated and could be compared with subsequent observations of the target, thereby forming a feedback loop. The information on relative position was then fed into an angle solver which converted it into torpedo gyro angles needed to actually hit the target, this was then set into the torpedos. Both of these were automatic and continuous, so the torpedos were theoretically ready to fire at any time.
Other navies' torpedo fire control instruments were somewhat more rudimentary. They universally lacked the feature of the continuously generated solution and instead worked in the moment. If the relative position changed, the inputs of the computer had to be altered. They also lacked the feedback loop between prediction and observation. Some of them (Japanese in particular) probably had less or no automatic follow-ups.
While the US system in particular was quite advanced, submarine fire-control problem was still comparatively difficult due slow speed and limited availability of the ordnance and relatively slim sensor suite.
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