| Country of origin | USSR/Russia |
|---|---|
| Designer | NPO Energomash, V.K.Chvanov, V.P. Radovsky |
| Manufacturer | Yuzhmash |
| Application | Upper stage |
| Status | Operational |
| Liquid-fuel engine | |
| Propellant | LOX / RP-1 |
| Cycle | Staged combustion cycle |
| Performance | |
| Thrust, vacuum | Standard: 834 kN (187,000 lbf) Uprated: 912 kN (205,000 lbf) |
| Thrust-to-weight ratio | Standard: 75.55[note 1] Uprated: 82.66[note 2] |
| Chamber pressure | Standard: 162.8 bar (16.28 MPa) Uprated: 178.1 bar (17.81 MPa) |
| Specific impulse, vacuum | 350 s (3.4 km/s) |
| Burn time | 315 seconds |
| Dimensions | |
| Length | 3.87 m (12.7 ft) |
| Diameter | 1.95 m (6.4 ft) |
| Dry mass | 1,125 kg (2,480 lb) |
| Used in | |
| Zenit-2, Zenit-3SL | |
| References | |
| References | [1][2][3] |
The RD-120 (GRAU Index 11D123) is a liquid upper stage rocket engine burning RG-1 (refined kerosene) and LOX in an oxidizer rich staged combustion cycle with an O/F ratio of 2.6.[2][3][4] It is used in the second stage of the Zenit family of launch vehicles.[1] It has a single, fixed combustion chamber and thus on the Zenit it is paired with the RD-8 vernier engine. The engine was developed from 1976 to 1985 by NPO Energomash with V.P. Radovsky leading the development.[3] It is manufactured by, among others, Yuzhmash in Ukraine.[5]
It should not be confused with the RD-0120, which is a discontinued LOX/hydrogen rocket engine that was used in the Soviet Energia launch system.
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