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Engine Model: LR30. Government Designation: XLR30-RM-2. Designer: Reaction Motors. Developed in: 1952-1957. Application: D-558-3. Propellants: Lox/Ammonia. Thrust(vac): 222.600 kN (50,042 lbf). Chambers: 1. Country: USA.

Capable rocket engine planned for use in D-558-3 and X-15. Cancelled in favour of XLR-99.

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