The project also includes developing prototypes of new-generation liquid-fueled rocker engines equipped with diagnostics and protection systems as well as structural elements from composite materials.

„We plan to build a methane-powered engine prototype even though a rocket-carrier equipped with it is not in development so far. It would be a stepping stone for our future projects, and it would help us compete with foreign rivals. Currently, the plan is developing a medium-thrust engine for the second stage of a future rocket,” a source close to the initiative told Russian newspaper Izvestia.

The initial plan was to install a methane-powered engine on the new Feniks rocket. However, later the budget was adjusted and the idea was abandoned in favor of restoring the Zenit project, equipped with a modernized RD-171 engine.

As a whole, the project is an important part of Russia’s efforts to create a low-cost, easy-to-maintain returnable rocket. The new booster could cut costs of space transportation thanks to its reliance on new engines powered by environmentally safe and widely available propellant made of cryogenically cooled natural gas (or methane) instead of traditional kerosene fuel.