Ottobrunn 300N
Engine · Germany
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Ottobrunn LOx/LH2 rocket engine. 300 N. Upper stages. Developed 2000.- highest value ever achieved in Europe for an engine of such small size.
This 300 N cryogenic propellant engine had a vacuum Isp of 415 seconds - the highest value ever achieved in Europe for an engine of such small size. Characteristic chamber length was 0.4 m; overall efficiency 91%; thrust could be varied from 240 to 480 N with the chamber pressure varying from 4 to 8 bar, mixture ratio from 3.5 to 6.5, and the propellant mass flow rate from 0.06 - 0.12 kg/s.
Engine: 1.88 kg (4.15 lb). Chamber Pressure: 5.00 bar. Area Ratio: 57. Oxidizer to Fuel Ratio: 5.5. Restarts: 4.