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Thanks Hitman, great information from you, as usual. Actually I would not feel very confortable firing with this large gyro angles, I even read (somewhere in SHIII documentation) that in early war gyro angle should be smaller than +- 60. Did you try this kind of shooting in SH3?
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Yes and it works very well if you have the correct data

The main reasons for not using large Gyro Angles were two:
1.- More difficult firing solution, specially more dependant on the distance (You are taking bearings and calculating from the scope or UZO, which is in fact some 40 metres behind the Torpedo tube

so the torpedo must have a convergence and cross the line of sight of your UZo/Scope at the distance you estimated your target is. Failiure in distance is then fatal as the torpedo is aimed incorrectly).
2.- Chances of the torpedo not turning accurately, either by mechanical failiure or simply by currents or rough seas deviating it.
90º/270º is however much better than anything intermediate for both the easyness of the firing solution and the tactical possibilities it offers. Specifically, it is a wonderful shot when you miscalculated your approach or the target zigged and you would be too close if you stay in perpendicular course. Changing direction to a paralell course (Either same direction for bow shot or opposite for stern tube shot) ensures the distance to target at the moment of shooting will no longer increase