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Hitman, from your pictures of the TDC I couldn't help notice the Ship Length dial (at least on that version)... Was it linked to a time dial to calculate target speed? Considering that the sub's own course and speed are known to the TDC, a mecanical computer like the TDC could calculate the target's speed for any bearing and at any speed
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Nope as far as I know. The TDC was mainly an angle solver and the speed inputs for target and torpedo are considered from a static point of view (i.e. length of the sides and not true motion of objects). What the TDC does is just tell you the lead angle for torpedo and target vectors intersect point, and also the resulting track angle at which they will intersect (And if the U-Boat is not aiming already at that lead angle, it will set it as Gyro Angle for the torpedoes and make the proper parallax correction). There is no actual input of "time" there which could be coaxed into providing a speed result.