The Bell X-1 (Bell Model 44) is a rocket engine–powered aircraft, designated originally as the XS-1, and was a joint National Advisory Committee for Aeronautics–U.S. Army Air Forces–U.S. Air Force supersonic research project built by Bell Aircraft. Conceived during 1944 and designed and built in 1945, it achieved a speed of nearly 1,600 km/h in 1948. A derivative of this same design, the Bell X-1A, having greater fuel capacity and hence longer rocket burning time, exceeded 2,600 km/h in 1954. The X-1 aircraft article 46-062, nicknamed Glamorous Glennis and flown by Chuck Yeager, was the first piloted airplane to exceed the speed of sound in level flight and was the first of the X-planes, a series of American experimental aircraft designed for testing new technologies.
Tips to fly
1. have Atmospheric Autopilot & Mouse Aim flight installed
2. use Mechjeb2 kill rotate
3. I have added a drag chute in case you need to slow down quicker on the runway
4. on landing deploy flap deflection to 53, should be enough to slow the aircraft down quick enough for landing
5. install ship manifest, to drain the fuel after you shutdown the rocket engine
6. not recommended to fly pass 20 kilometers altitude
7. have fun flying, please done crash it, its expensive to build unless your on sandbox
Link to RP-1 Express install wiki: https://github.com/KSP-RO/RP-1/wiki/RO-&-RP-1-Express-Installation-for-1.12.3
Built in the SPH in KSP version 1.12.5.