Reaction Motors XLR99

The Reaction Motors LR99 engine was the first large, throttleable, restartable liquid-propellant rocket engine. Development began in the 1950s by the Reaction Motors Division of Thiokol Chemical Company to power the North American X-15 hypersonic research aircraft. It could deliver up to 57,000 lbf (250 kN) of thrust with a specific impulse of 279 s (2.74 km/s) or 239 s (2.34 km/s) at sea level. Thrust was variable from 50 to 100 percent, and the restart capability allowed it to be shut down and restarted during flight when necessary.

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XLR-99; XLR99; YLR-99; YLR99
rocket engine, Reaction Motors, 
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Frameless

XLR-99 Rocket Engine USAF

North American X-15 Nozzle

NJAHOF XLR99 03

NJAHOF XLR99 02

NJAHOF XLR99

XB-70 1 USAF MUSEUM DAYTON (42970850041)

Developed by the Reaction Motors Division of Thiokol for North American, it was the first large man-rated rocket engine that could be throttled and with restart ability, and could deliver 57,000 pounds of thrust.

The XLR-99 Pioneer rocket engine was he most powerful ever installed on a piloted aircraft and the first directly throttleable rocket engine.

Type	Subtype	Date	Description	Notes	Source
commons	image		XLR-99 Rocket Engine USAF		Commons
commons	image		North American X-15 Nozzle		Commons
commons	image		NJAHOF XLR99 03		Commons
commons	image		NJAHOF XLR99 02		Commons
commons	image		NJAHOF XLR99		Commons
commons	image		XB-70 1 USAF MUSEUM DAYTON (42970850041)		Commons
commons	image		Developed by the Reaction Motors Division of Thiokol for North American, it was the first large man-rated rocket engine that could be throttled and with restart ability, and could deliver 57,000 pounds of thrust.		Commons
commons	image		The XLR-99 Pioneer rocket engine was he most powerful ever installed on a piloted aircraft and the first directly throttleable rocket engine.		Commons