... The first domestic liquid-propellant rocket engine with afterburning of generated gas in a combustion chamber allowed to achieve a specific impulse of up to 340 kgf s/kg in vacuum when using main components. ... Fuel components: . ... fuel . ... The engine has a more heat-intensive combustion chamber, therefore, RG-1 is used as fuel. When launching heavy-lift spacecraft, synthine can be used in the capacity of fuel without re-designing the engine. ... Official WEB-site of S.P.Korolev RSC Energia . ...