Ok M.M. I am able to adjust the diving time via the time it takes the main ballast tanks to flood in a crash dive situation.
I made a simple test mission with a IXc with no wind, clear weather and the boat cruising at nine knots.
With the file you have, this boat can reach 20 meters in approx. 45 seconds (what a pig !
).
Tell me what time frame in seconds you'd like. I figured I'd only do the IX's, is that correct ?