The Souyz-5 booster is expected to launch for the first time in December, Roscosmos has said A successful ground test of the first-stage of the Souyz-5 rocket has concluded at a range in the Moscow Region, the Russian space agency Roscosmos has said. The Soyuz-5 is a two-stage, medium-class launch vehicle with an increased payload capacity of up to 17 tons. It is intended as a replacement for the Proton and Zenit boosters. Roscosmos said previously that it plans to carry out the first test