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even on TDC the range doesnt matter... range only gives you a time to impact and lets you know how many seconds should elapse before the hit is scored. this way you can know that if it has been 35 seconds and you have not observed an impact, and the estimated time to impact was 15 seconds... you have probably missed.
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If so, why turning range dial in TDC changes gyro angle? It affects torpedo trajectory...
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I just ran it again with all TDC settings zeroed out, and fired a snapshot in a zero bearing with 7-8 degrees lead. All three torpedoes missed astern... something is off about the lead calculation.
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This is very strange. I recognize that this 90 degree method isn't very comfortable, but I believe it is most effective for impact torpedoes, which, as I red, should be preferred in early war.
As for calculation, I used the table shown above, and also this tool provided by Matmos GUI:
I don't know if you are familiar with it. Outer ring represents target speed x10, middle ring - torpedo speed. You turn middle ring until these points match, and x provides lead angle.
In this case: middle ring set at 44 (fast torpedo speed), outer ring - 50 (5kts x 10), and x reads 6,5 degrees.
What exactly is wrong with this method, then? I used it dozens of times with great results...
I will try my luck with TDC then, but could you comment on this method I described? Why it didn't work? Target speed is definitely 5kts, AOB is 90 degrees, more or less... Why do torpedoes miss astern?