<page_title> RD-120 </page_title> <section_title> Versions </section_title> <table> <cell> 11D123 <col_header> RD-120 </col_header> <row_header> AKA </row_header> </cell> <cell> Oxidizer Rich Stage Combustion upper stage liquid rocket engine <col_header> RD-120 </col_header> <col_header> RD-120 (augmented thrust) </col_header> <col_header> RD-120K </col_header> <col_header> RD-870 </col_header> <row_header> Engine Type </row_header> </cell> <cell> RG-1/LOX (O/F 2.6) <col_header> RD-120 </col_header> <col_header> RD-120 (augmented thrust) </col_header> <col_header> RD-120K </col_header> <col_header> RD-870 </col_header> <row_header> Propellant </row_header> </cell> </table>
The RD-120 (11D123) is a oxidizer rich staged combustion upper stage liquid rocket engine and RG-1/LOX with an O/F ratio of 2.6.