Subject: Reaction Motors XLR-99
Location: USAF Museum, Dayton, Ohio, USA, 2014
Comments: The XLR99 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 X-15 research aircraft. It could deliver up to 57,000 pounds force (254 kN) of thrust with an Isp of 279 seconds (239 seconds sl). Thrust was variable from 50 to 100 percent, and the restart capability allowed it to be shut down and restarted during flight when necessary.(References: Wikipedia)
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