Depth settings, pistol setting and speed settings can be set individually for each torpedo. (Select the right tube when you do) However there is a bug with selecting different torpedo speeds and selecting different tubes. The TDC aim calculation is not updated when you do. So set the speeds in all tubes the same to avoid them going in the wrong direction.. Make sure these are set well before you are in position and waiting. You do not want to make mistakes in this in the heat of the moment.
It's easiest if you focus on the ships in the same row. (ships are aside from each other) Do it one row at a time. If you try to hit ships behind each other (single column) or diagonally in the convoy then it is hard to get the timing right for simultaneous hits. And you risk some ships taking the torpedo intended for others.
I would set up on the side of a convoy, and pointing perpendicular to their course. It doesn't have to be perfect, within +- 5 degrees would simplify setting up the TDC and periscope. Be careful of getting too close to flank protecting destroyers.
Select the intended torpedo tube (forward or rear).
Point the periscope/UZO to 0 (or 180).
Go to the TDC screen (F6).
Flip the TDC Manual input switch to 0 (red).
Adjust the AOB arrow to 90 in the direction that the target will move through the periscope view. (Left to right points to the right/green, and vice versa)
Set the target speed (you should have figured this out before).
Range dial setting can be ignored (when gyro angle will be set to 000/180 later).
Flip the Manual input switch back to 1 (white).
Adjust the periscope between 5 an 15 degrees until the Gyro angle indicator indicates 000 for front torpedo attack, or 180 for rear torpedo attack.
Open all torpedo tubes in preparation of firing torpedoes.
Wait, until the ship in the furthest column crosses the aiming wire. Then fire. The torpedo moves straight ahead out of the tube.
Repeat, firing the next tube as each column ship starts to cross the wire.
If you set up the TDC and periscope such that the gyro angle indicator is 000 (or 180 if using the rear torpedoes) then the range setting can be ignored completely. This way each ship can be aimed at with the same periscope and TDC setting. No need to adjust the periscope any more. (Perhaps only up/down to avoid detection by nearby target) All that is required is waiting for each ship to pass the line an fire the torpedo intended for it. The most distant target is fired upon first. Each column will pas the line in the right order. The closest comes last.
When performed correctly the torpedoes should hit within seconds of each other depending on which part of the hull was on the periscope line when fired.
When the last torpedo is fired, make haste in getting deep. I usually also turn in the same course as the convoy. I don't really want to be below them when they sink. Though the defending destroyers do try to avoid collisions. So being below the convoy does help. When you are at a deep depth I would slow down to a speed around 1 knot to reduce noise. Silent running also applies of course.
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