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Otrag Stage Cutaway

Credit - courtesy Lutz Kayser
Model: Otrag. Gross Mass: 1,500 kg (3,300 lb). Empty Mass: 150 kg (330 lb). Thrust (vac): 26.960 kN (6,061 lbf). Isp: 297 sec. Burn time: 140 sec. Propellants: N2O4/Kerosene. Propellant Formulation: (50% N2O4- 50% HNO3/Diesel fuel or Kerosene. Isp(sl): 240 sec. Diameter: 0.27 m (0.88 ft). Span: 0.27 m (0.88 ft). Length: 16.00 m (52.00 ft). Country: Germany. No Engines: 1. Motor: Otrag. Status: Retired 1983. Cost $ : 0.025 million. First Flight: 1977. Last Flight: 1983. No Launched: 1152. Other designations: CPRU.

Clustered to form Otrag launch vehicles. Pressure-fed, using cheapest possible propellants. Injection pressure: 40 - 15 bar; Thrust control: 100% - 40 %; Pressurization: Compressed air 66% tank filling in blow-down mode; Injector: Radial like on like; Chamber cooling: Ablative phenolic; Material of injector, valves, bulkheads: AlMg5; Material of cylindrical tank sections: cold rolled low carbon stainless steel.

Used on Launch Vehicles:
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© Mark Wade, 1997 - 2008 except where otherwise noted.