Ok, hope this helps:
You are correct in realizing that the T1 is superior in range and speed, but the trail of bubbles is why it wasn't used much. A warship would spot these and evade quickly. Not only did it evade, but it gave a direction on where you were. The T2's are slower, has a shorter range, but the lack of bubbles made it more difficult to detect. There should be a difference in connecting with a shot, esp on auto targetting. Make sure your within 1500 m and don't use a magnetic pistol in rough waters, they pre-detonate often.
And about being detected, if you are running GWX, then you want to set silent running and go to silent speed right away. Don't knuckle your rudder (go hard to port/starboard) unless the destroyer is right on you. I usually use 5-10 degrees to evade a destroyer. When you run at higher than 1/3, you bat's will drain quickly, esp in early war subs.
Here's what I do when I'm detected:
Rig for silent running.
Set speed 2kts.
DIVE. (Deeper the better)
Set rudder 5-10 degrees in the direction of the destroyer.
Listen to the hydrophones, when you hear the destroyer over top of you, or your hear depth charges, go ahead flank and run your rudders hard to the opposite direction you were before. Keep ahead flank until the depth charges subside, then back to silent speed.
This is quite effective I find, esp in early war. later on, you best pray you have an inexperienced destroyer on you or the luftwaffe comes, or else you history.
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