Operational History
The XLR11-RM-5 engine was first used in the Bell X-1. On October 14, 1947, the X-1 became the first aircraft to fly faster than the speed of sound (Mach 1). The XLR11-RM-5 was also used in the X-1A and X-1B, and as a booster engine in the U.S. Navy's D-558-2 Douglas Skyrocket turbojet (where it was designated the XLR8-RM-5).
In 1959 and 1960, while development of a more powerful engine was still underway, a pair of XLR11-RM-13's were used as an interim power plant for the initial flights of the X-15 research aircraft. These engines were boosted to 2,000 lbf (8.9 kN) of thrust per chamber for a total of 16,000 lbf (71 kN). In comparison, the idle thrust of the X-15's XLR99 engine was 15,000 lbf (67 kN). After 24 powered flights, the XLR11 engines were replaced by the new XLR99 engine in November 1960.
The XLR11-RM-13 was also used in the Dryden lifting bodies, and as a booster engine in the Republic XF-91 Thunderceptor turbojet.
Read more about this topic: Reaction Motors XLR11
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