X-4: A Short History – Experimental aircraft are commonly understood to go faster and fly higher than other planes. It is a sound understanding. Chuck Yeager piloted the X-1 right past the sound barrier, and the X-2 flew even faster than the X-1. Today, the X-15 still holds the records for speed and altitude, even […]
… The X-4 Was a Valuable Failure .. on 19FortyFive.