In 1944 he formed his own design bureau to engineer liquid-propellant engines.

Stage 2 used the LR91 liquid-propellant engine.

The five rockets of the Southern Cross family will be based on Russia's Angara vehicle and liquid-propellant engines.

In terms of feeding propellants to combustion chamber, cryogenic rocket engines (or, generally, all liquid-propellant engines) work in either an expander cycle, a gas-generator cycle, a staged combustion cycle, or the simplest pressure-fed cycle.