"As for the whole project, we are counting on four years from the start of the fully-fledged work…According to our estimates, the work will begin in the first half of next year," the official said.
He clarified that the project to create a reusable stage was dubbed "Wing-SR" (stage reusable).
"The subsonic prototypes that are planned to be built within the next four years will be used to practice automatic landing and flight at subsonic speeds, while the hypersonic prototypes, will be used, respectively, to practice flight at hypersonic speeds," the official said.
"The development and testing should result in a fully-functioning demonstrator with a rocket engine that will be able to perform the entire test cycle, starting with the launch and flight to the required altitude, and ending with the return landing," the official added.
He specified that the Baikal booster project, which was developed by the Khrunichev Center, was taken as the basis for the prototype of the reusable winged stage of the future carrier rocket.
He also noted that the experience of Elon Musk's SpaceX company would be taken into account in the development the winged stage.
"Having studied all such projects, we came to the conclusion that the most appropriate way for Russia is the return to the development of a winged stage," he added.