The Bell X-1 was initially called the XS-1 for "experimental - supersonic." The designation was later simplified to X-1. The X-1 program was the first of a series of "X" experimental manned and unmanned projects that continues to this day.
The Bell X-1 was initially called the XS-1 for "experimental - supersonic." The designation was later simplified to X-1. The X-1 program was the first of a series of "X" experimental manned and unmanned projects that continues to this day.