AJ26-NK33A (Aerojet and Kuznetsov)
Developed from a venerable Russian rocket engine, the NK33A combines Russian robust design and reliability with American performance enhancements and manufacturing capability.

| Specification | |
|---|---|
| Applications | Soviet N-1 moon rocket (1970), Kistler K-1 RLV (present) |
| Propellants | LO2/HC |
| Thrust in Vacuum | 339,000 lbf |
| Thrust at Sea Level | |
| Isp in vacuum(s) | 331 |
| Isp at sea level | 297 |
| Mixture Ratio | 2.6:1 |
| Weight | 2725 lb |
| Chamber Pressure | 2109 psia |
| Expansion Ratio | ???? |
| Engine Cycle | ???? |
| Pump Design Pressures | ???? |
LR91-AJ-11 : AJ10-188K 