One thing I would modify to your tactic:
Quote:
90 deg course change then silent running
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I would go to silent running
before making the course change.
I order flank speed till I get the best possible speed, cut the engines to silent speed, and then use that momentum to get the turn started. Rudder hard to port/stb bleeds off speed too quickly so I usually manually input the rudder to 20-30degrees as a compromise between agility and speed.
To the AI, you are (hopefully) a lost contact that is still on the course you were on before going silent and turning. That's how I shake em' because usually they sweep your last known course trying to regain contact.