WHAT DOES SILVER COIN OF SUPERSONIC PLANE MEAN?

I had no apprehension over it mainly because we experienced no rocket gas on board. And so once we obtained to altitude and went in the typical method of countdown and right here I used to be in an extremely very small cockpit and it was incredibly dim, and Hastily once the X-1 was produced with the B-29 I had been in shiny sunlight And that i coul