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LR91

The LR91 was an American liquid-propellant rocket engine, which was used on the second stages of Titan intercontinental ballistic missiles and launch vehicles. While the original version - the LR91-3 - ran on RP-1/LOX (as did the companion LR87-3) on the Titan I, the models that propelled the Titan II and later were switched to Aerozine 50/N2O4.

Versions
• LR91-3: Titan I version. Run on RP-1/LOX. • LR91-5: Titan II version. Propellant was switched to Aerozine50, N2O4. • LR91-7: Similar to LR91-5, it was used on Stage 2 of Gemini Titan II. This version was human rated. • LR91-9: Used in earlier versions of Titan III upper stage. • LR91-11: Version used on the Titan III and Titan IV. File:Titan II Aerojet Engine (8562930583).jpg|LR91-5 File:Aerojet LR91-7.jpg|LR91-7 File:LR91-AJ-11 rocket engine.jpg|LR91-11 ==See also==
Source: Wikipedia ↗
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