Quote:
Originally Posted by Commander Mysenses
Or an error in your calculation! 
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Thanks for trying that out!
It confirms what I thought - that the fast setting of the G7a is
44 kts and not
40 kts as they were on the actual U-boats.
There's no error in the calculation. There may be slight inaccuracies caused by measurement since I'm using the ruler on the map which is only marked in 50m intervals, as you point out. Considering I'm using the Queen Mary at a speed of 25 kts for target practice, where I am firing the torpedo at the middle of a ship that is almost 300m long - one second error in timing is neglegible. It amounts to 12.8 metres.
The problem was that I was assuming 40 kts was the fast torpedo speed, and using this figure in my calculations, when in actual fact the torpedos were doing 44 kts. This is why they were overshooting by over 300 metres.
Well, at least that's cleared up!