Engine Model: X45ALD-4000. Manufacturer Name: X45ALD-4000. Government Designation: XLR13-AJ-3. Designer: Aerojet. Developed in: June 1948. Application: B-29 ATO. Propellants: Nitric acid/Amine. Thrust(sl): 17.600 kN (3,957 lbf). Burn time: 60 sec. Mass Engine: 403 kg (888 lb). Diameter: 0.94 m (3.08 ft). Length: 4.50 m (14.70 ft). Chamber Pressure: 21.40 bar. Country: USA. Development begun June 1948. Regenerative cooling, nitrogen pressure-fed, droppable but no recoverable. Early version using XLR-13-AJ-1 thrust chamber assembly.