On the other hand, a train doesn't have an equal weight of water pushing against it all the time. Ships do decelerate relatively quickly (relative to cars and trains, that is) but the slower the ship is going the less the drag, so it might drop from 15 to 10 knots in a lot less time than it takes to drop from 10 to 5 knots. Funny, that is very much how your tests look.
I think test one is closer to reality, but that's just what I think, not based on any hard facts.
On the other hand, there is no way Kongo is going to accelerate to 5 knots in 15 seconds. Should be more like 5 minutes. To 20 knots should take 30 minutes or more. I'll get some numbers from home and put them up tomorrow.
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