Kudos to 100% realism.
I would recommend playing with map contacts on until you get the hang of things.
The map contacts on allows you to understand precisely the relationship of the target to your boat, and it allows you to know precisely the target speed, by using the 3 minute 15 second measurement on the map. With this information you can input virtually exact information into the TDC and have confidence that your data is good.
If you are shooting with a 000 gyro angle, then the torpedo will fly straight out from your sub. Thus if the target is moving right-to-left, you will have to move the periscope to the right of 0 bearing to lead the target. Likewise if it is moving left-to-right, you will have to point the scope to the left of 0 bearing to lead the target.
My first thought is that you are setting the AoB incorrectly on the TDC. This is easy to do - I sometimes screw it up on attacks even now and have wasted more than one torpedo that way.
The AoB is the angle from the bow of the target to you. If you are doing a 90 degree shot, then you will point to 90 starboard if your boat is to the right of the target's heading, and you will point it to 90 port if your boat is to the left of the target's heading. If you set this backwards, your torpedo will fire in the wrong direction with "reverse lead".
If you know the target speed and you approach at 90 degrees, a hit is virtually assured against merchant ships or warships when using electric torpedoes. Warships can see and will actively try to dodge steam torpedoes.
Steve
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