Ok, that might explain why last night I had a Ta-152 bury the needle well past 700mph in about a 20 degree dive...  I thought it was a bit fast, but I'm pretty new to things in here, so at the time I figured maybe it was supposed to do that.  Then upon reflection, I realized I was theoretically supersonic...
At first I was all like,  

 but now I'm all  

Wiley.