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Originally Posted by Usurpator

I believe you are wrong. The deflection angle(β), the impact angle(α), and the angle on the bow(γ) form a triangle. The sum of the angles of a triangle is always 180 degrees, thus we can calculate the angle of impact as: α=180°-(γ+β).



Source:
http://www.tvre.org/en/torpedo-calculator-t-vh-re-s3

As far as I know an impact angle of 180° means that the torpedo would hit the ship in the back. Also a angle of bow of 0° would mean that the ship is heading right towards the viewpoint (the submarine) and therefore the torpedo would be unable to hit the ship in the back unless it would round the ship first.