Bell X-1B. The X-1B was one of a series of rocket powered experimental airplanes designed to investigate supersonic flight problems. The X-1B’s flight research primarily related to aerodynamic heating and the use of small “reaction” rockets for directional control.
TECHNICAL NOTES:
Engine: Reaction Motors XLR-11-RM-6 four-chamber rocket engine of 6,000 lbs. thrust
Maximum speed: 1,650 mph
Maximum altitude: 90,000 feet
Landing speed: 170 mph
Weight: 16,590 lbs. loaded