Engine Model: Aestus. Designer: Friedrichshafen. Propellants: N2O4/MMH. Thrust(vac): 29.000 kN (6,519 lbf). Isp: 324 sec. Burn time: 1,100 sec. Mass Engine: 111 kg (244 lb). Diameter: 1.32 m (4.33 ft). Length: 2.20 m (7.20 ft). Chambers: 1. Chamber Pressure: 11.00 bar. Area Ratio: 84.00. Oxidizer to Fuel Ratio: 2.05. Country: Germany. Status: In production. First Flight: 1996. Last Flight: 2005. Flown: 22. Upper stage engine for Ariane 5. Pressure (helium) fed. Electromechanical gimbaled nozzle (9.5 deg). Original version could not be restarted; version for EPS L10 stage for Ariane 5V allowed multiple restarts. The Aestus rocket engine was developed at the Ottobrunn Space Propulsion Centre during the period 1988 - 1995. The first operational flight of Aestus was on 30 October 1997 on Ariane 5 flight 502.
Aestus used on Rocket Stages
Aestus used on Spacecraft
Bibliography:- Kudryavtseva, V M, ed., Zhidkostnikh Raketnikh Dvigatley, Visshaya Shkola, Moscow, 1993.
