Engine Model: LR39. Manufacturer Name: D-50G1. Government Designation: XLR39-RM-1. Designer: Reaction Motors. Propellants: Lox/Alcohol. Thrust(vac): 225 N (50 lbf). Mass Engine: 0.66 kg (1.45 lb). Diameter: 0.0380 m (0.1240 ft). Length: 0.22 m (0.73 ft). Chambers: 1. Chamber Pressure: 16.70 bar. Thrust to Weight Ratio: 34.84. Country: USA. Small experimental engine. Single thrust chamber, water cooled, equipped only with spark plug igntion system and propellant flow valves. Test article only built.