Took 5 minutes with wind.
30k: turned wind off, let it settle. No real difference noticed.
40k: a little wonky. speeds around 250 indicated.
50k: Flew around like a zeke with 5-6g flat turns. Weird indeed =]
Put it in a nose dive and never really broke the 600 mph barrier. Wings ripped at 2k and death ensued.
2nd try I turned wind off at 35k, stalled and began to spin. I could NOT recover no matter what I did til about 4k. odd