The 40kt (or whatever) limit is from the propulsion...but setting off the e-blow is like adding propulsion. It's not as if you're going 70 knots in the horizontal, but simply because you're going up pretty fast AND straight ahead pretty fast. I don't think it's necessarily realistic -- at the least it would have to be just short of super-human to control a sub under those conditions -- but I don't see how it's wrong on the part of the model.
I don't know how subs measure speed, but if they use something analogous to a pitot tube (it's a fancy straw that "feels" the air hitting it to report the speed), then it might not be realistic for the submarine to be able to report the high speeds.
|