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Reaction Motors/Thiokol XLR99

The Engine Specifications
The XLR99 was used to power the X-15 research aircraft and was the first large liquid propellant rocket capable of being throttled and restarted.  The engine used up to 10,000 lbs of fuel per minute.

The XLR99 was also known as the Pioneer.

Liquid-fuel rocket
Fuel: anhydrous ammonia
Oxidizer: liquid oxygen (LOX)
Models Used by
XLR99-RM-2: 57,000 lb (250 kN) thrust (at high altitude)
North American X-15
Related Pages
More about Reaction Motors

page updated 12 April 2003



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Kenneth W Shanaberger 2000 - 2010