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XLR-11 Rocket Engine
The X-1 was powered by a four-chamber, XLR-11 rocket engine,
fueled by a mixture of liquid oxygen and diluted ethyl alcohol.
Although not throttleable, the chambers could be fired individually
or in groups to produce a maximum rated thrust of 6000 lbs.
at sea level.
Fuel capacity limited full-power of the engine to about five
minutes.
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