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RD-270 is a single chamber liquid propellant rocket engine, designed in NPO Energomash in 1960-1970. It has the highest thrust among single chambered engines of USSR, that of 640 metric tons on the surface of Earth. The propellants used are unsymmetrical dimethylhydrazine (UDMH) and nitrogen tetroxide (N2O4). The chamber pressure is among the highest, being about 26 MPa. This allows to have the specific impulse of 301 s on the Earth surface. The propellants are coming into chamber in mostly gaseous form. The engine testing was underway, when the decision was made to cancel the program.
