Neat! I took the ducted fan F-86 up to 20K and same thing, no ground view for a long time. It hit a terminal velocity of around 235 going down. I tried the turbine F-86 and it won't climb, weird I know but about 4000' was all it could do before the flip overs became annoying.

As for top speed I flew the "super sized" F-86 that is downloaded from the Real Flight website. That thing cooks and hits 350 in level flight. But I noticed when I hit 400 my airspeed resets back to zero and starts counting up again. Everytime it hits 400 it resets.