Cdre, you ROCK
I suppose I can now play with the .sim file of the IXD/3 (U-cruiser) now. Now, let's see...
Terrible turn radius
Dive time 1,25 minutes
Surface speed 26 kn
Submerged speed 5,5 kn
Submerged range 30 nautical miles @4kn
But on the surface...
This u-boat would have success in 1940 only if it could coordinate a tight small wolfpack (1 U-cruiser, 3 VIIBs). Something like a U-hunter killer group. The VIIBs would go for the DDs first and then the U-cruiser would surface....
Thanks again Cdre!