Ah yes. Still, Soyuz uses different fuel to drive the pumps from the main propellants. Hydrogen peroxide monopropellant for pumps, liquid oxygen and kerosene fo

Ah yes. Still, Soyuz uses different fuel to drive the pumps from the main propellants. Hydrogen peroxide monopropellant for pumps, liquid oxygen and kerosene for main propellants. This is V-2 heritage. Back then the turbine materials were not developed yet that could take the high heat.