The RD-0120 (Russian: Ракетный Двигатель-0120, romanized: Raketnyy Dvigatel-0120, lit. 'Rocket Engine 0120', GRAU index: 11D122) was the Energia core rocket engine, fueled by LH2/LOX, roughly equivalent to the RS-25 (Space Shuttle Main Engine, SSME). These were attached to the Energia core rather than the orbiter, so were not recoverable after a flight, but created a more modular design (the Energia core could be used for a variety of missions besides launching the shuttle).
The RD-0120 (Russian: Ракетный Двигатель-0120, romanized: Raketnyy Dvigatel-0120, lit. 'Rocket Engine 0120', GRAU index: 11D122) was the Energia core rocket engine, fueled by LH2/LOX, roughly equivalent to the RS-25 (Space Shuttle Main Engine, SSME). These were attached to the Energia core rather than the orbiter, so were not recoverable after a flight, but created a more modular design (the Energia core could be used for a variety of missions besides launching the shuttle).
Source: Wikipedia "RD-0120" · CC BY-SA 4.0
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