X-1 was created to take a look at that Room — and in the end fly outside of it, getting to be a supersonic craft.
when they heard a boom on the bottom, Yeager signaled to Ridley, “This machmeter is all screwy!” https://joshekbr352201.blogchaat.com/29917928/the-best-side-of-supersonic-plane-in-silver-coin