It wasn't that the X-1 would kill you, it was the systems in the X-1 that would kill you.
Chuck YeagerAs we went through mach one, the nose started dropping, so we just cranked that horizontal stabilizer down to keep the nose up. We got it above mach one, and once we got it above the speed of sound, then you have supersonic flow over the whole airplane, so you have no more shock waves on it that are causing buffeting...You really don't think about the outcome of any kind of a flight, whether it's combat, or any other kinds of flights, because you really have no control over it.
Chuck Yeager