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Originally Posted by Bosje
I've been toying around with that as well, lol
what I did come up with so far is this:
your average destroyer is round about 100 meters long. 195/time it needs to cross your view = speed (roughly)
this comes out reasonably accurate, launch fast eel x degrees ahead or slow eel 2x degrees ahead has scored me several hits so far
i suck at math tho, completely unable to come up with a definitive solution for the value  |
Just make yourself one of these:
Then, you just match the length of the ship in meters against the amount of time it took to travel against your fixed point (ie., periscope/UZO crosshair), and bingo, you read the target speed in knots.
By the way, I've used the fixed wire method while
overtaking a ship. When you are on a parallel course, set your periscope/UZO wire at 90 degrees from your course, then see how long it takes the ship to pass. Say you get a result of 6 knots, and you are travelling at 13 knots. Target speed: 13-6=7 knots.