Im not sure that his specific question is answered in that thread. I dident read the entire thread so if I'm wrong please correct me.
This topic (determining speed by counting turns of the ships screws) comes up periodically and has been discussed at length.
The final concensis was that it could not be done to any degree of accuracy. You can basically determine one of three settings idle, medium, & fast.
Of course each ship has a different speed for those settings so once again your relegated to guess work.
In real life it was a viable tactic but due to the limitations in the game engine you get a rough guess at best. Also in real life the 'doppler' effect was used as well to determine wether or not a contact was closing of leaving. Again this is difficult at best in the game.
Good luck have fun.
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