Russia launched the Progress M1-6 tanker aboard the first uprated Soyuz FG booster from Baikonur to the International Space Station (ISS) on 20 May. The Progress docked with the ISS three days later.
The FG is the first of three upgrades intended to result in the development of the Soyuz 2, or Rus vehicle, which would be able to place 8,200kg (18,000lb) into low Earth orbit compared with the 7,300kg of the current Soyuz U. The future schedule for Rus development is uncertain, however, according to the UK's Molniya Space Consultancy.
The Soyuz FG has improved NPO Energomash RD-107 core stage and RD-108 strap-on engines, giving a minimal improvement in payload capability and greater efficiency. The improved engines have been developed initially to launch slightly heavier Soyuz and Progress craft to the ISS and will also be used on the Soyuz/ST operated by the Starsem commercial operation.
The next upgrade to the booster will be the Soyuz 2-1A, which will have a new RD-0124 third stage engine, replacing the RD-0110.
The Soyuz 2 Rus is also due to fly with a new guidance system and core and strap-on stages, equipped with new RD-120M engines.
The Progress M1-6 carried 1,406kg of cargo to the ISS, including spares, computer equipment, fuel, food and personal items.
Source: Flight International
