You must remember what the gyroscope is actually doing. Before launch, the gyro is set to an angle to zero degree bearing. The way gyros work, they will want to turn into this new course and stabilize themselves there once they are on the new course. The gyro setting is not a turn rate setting but a course setting, a course relative to the longitudal axis of the torpedo's pre-launch position.
Example: Your boat is on a 250* true course and you fire the torpedo with a 30* port turn gyro setting. That will take the torpedo to the course of 220* true heading. It will not continue the turn after reaching 220* because this is the heading where the gyroscope is not fighting back to correct the course. This is the course that makes the gyroscope happy.
If your true course is 315* true heading, then a 30* port gyro angle will see the torpedo take the true course of 285* true heading.
After this heading is achieved, no more turning takes place and with no turn, there is only a straight run left to do.
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