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Otrag CPRU

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Otrag Stage Cutaway Credit: courtesy Lutz Kayser

AKA: CPRU;Otrag. Status: Retired 1983. Thrust: 26.96 kN (6,061 lbf). Gross mass: 1,500 kg (3,300 lb). Unfuelled mass: 150 kg (330 lb). Specific impulse: 297 s. Specific impulse sea level: 240 s. Burn time: 140 s. Height: 16.00 m (52.00 ft). Diameter: 0.27 m (0.88 ft). Span: 0.27 m (0.88 ft).

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.

Cost $ : 0.025 million. Propellant Formulation: (50% N2O4- 50% HNO3/Diesel fuel or Kerosene.