Engine Model: Mammouth. Manufacturer Name: NA801. Gross Mass: 2,900 kg (6,300 lb). Empty Mass: 1,000 kg (2,200 lb). Thrust(vac): 190.000 kN (42,710 lbf). Isp: 180 sec. Burn time: 18 sec. Chambers: 1. Country: France. First Flight: 1961. 1900 kg 'Plastolite' propellant. Empty mass estimated. Originally developed as the booster for the SSBT missile.