Engine Model: X4-AL-1000. Manufacturer Name: X4-AL-1000. Government Designation: XLR9-AJ-1. Designer: Aerojet. Application: Brake rocket for G-4A. Propellants: Nitric acid/Amine. Thrust(sl): 4.410 kN (991 lbf). Burn time: 4.00 sec. Mass Engine: 367 kg (809 lb). Diameter: 0.36 m (1.18 ft). Length: 1.07 m (3.51 ft). Chambers: 1. Chamber Pressure: 18.70 bar. Country: USA. Braking rocket for glider. Single uncooled chamber, pressure fed, 13 kg of propellant.