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Thiokol YLR99-RM-1

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The engine was designed to power the X-15 experimental rocket plane and was powered by liiquid oxygen (LOX) & anhydrous ammonia. Visit or Space exhibit building and X-Plane displays.

Technical Specifications
Rated Output 25,000 lbs to 57,000 lbs thrust
Dry Weight 910 lbs
Commonly Used On X-15