Soyuz (rocket family)

Soyuz

A Soyuz-FG rocket carrying a Soyuz TMA spacecraft launches from Baikonur Cosmodrome, Kazakhstan on 18 September 2006.
Function	Carrier rocket
Manufacturer	OKB-1 Progress State Research and Production Rocket Space Center
Country of origin	USSR Russia
Size
Stages	3
Associated rockets
Family	R-7
Launch history
Status	Active
Launch sites	Baikonur Sites 1/5 & 31/6 Plesetsk Sites 41, 16 & 43 Kourou ELS (with ESA) Vostochny Site 1S
First flight	28 November 1966
Notable payloads	Soyuz Progress

Soyuz (Russian: Союз, meaning "union", GRAU index 11A511) is a family of expendable launch systems developed by OKB-1 and manufactured by Progress Rocket Space Centre in Samara, Russia. With over 1700 flights since its debut in 1966, the Soyuz is the most frequently used launch vehicle in the world.^[1]

When the U.S. Space Shuttle program ended in 2011, Soyuz rockets became the only launch vehicles able to transport astronauts to the International Space Station.

The Soyuz vehicles are used as the launcher for the crewed Soyuz spacecraft as part of the Soyuz program, as well as to launch uncrewed Progress supply spacecraft to the International Space Station and for commercial launches marketed and operated by Starsem and Arianespace. All Soyuz rockets use RP-1 and liquid oxygen (LOX) propellant, with the exception of the Soyuz-U2, which used Syntin, a variant of RP-1, with LOX. The Soyuz family is a subset of the R-7 family.

History[edit]

Soyuz rocket engines

A space workhorse[edit]

The Soyuz launcher was introduced in 1966, deriving from the Vostok launcher, which in turn was based on the 8K74 or R-7a intercontinental ballistic missile. It was initially a three-stage rocket with a Block I upper stage. Later a Molniya variant was produced by adding a fourth stage, allowing it to reach the highly elliptical molniya orbit. A later variant was the Soyuz-U.^[2] While the exact model and variant designations were kept secret from the west, the Soyuz launcher was referred to by either the United States Department of Defense designation of SL-4, or the Sheldon designation of A-2 (developed by Charles S. Sheldon, an analyst with the Library of Congress). Both systems for naming Soviet rockets stopped being used as more accurate information became available.^[3]

The production of Soyuz launchers reached a peak of 60 per year in the early 1980s. It has become the world's most used space launcher, flying over 1700 times, far more than any other rocket. Despite its age and perhaps thanks to its simplicity, this rocket family has been notable for its low cost and high reliability.

Soyuz / Fregat[edit]

In the early 1990s plans were made for a redesigned Soyuz with a Fregat upper stage. The Fregat engine was developed by NPO Lavochkin from the propulsion module of its Phobos interplanetary probes. Although endorsed by the Russian Space Agency and the Russian Ministry of Defence in 1993 and designated "Rus" as a Russification and modernisation of Soyuz, and later renamed Soyuz-2, a funding shortage prevented implementation of the plan. The creation of Starsem in July 1996 provided new funding for the creation of a less ambitious variant, the Soyuz-Fregat or Soyuz U/Fregat. This consisted of a slightly modified Soyuz U combined with the Fregat upper stage, with a capacity of up to 1,350 kg to geostationary transfer orbit. In April 1997, Starsem obtained a contract from the European Space Agency to launch two pairs of Cluster 2 plasma science satellites using the Soyuz-Fregat. Before the introduction of this new model, Starsem launched 24 satellites of the Globalstar constellation in 6 launches with a restartable Ikar upper stage, between September 22, 1999 and November 22, 1999. After successful test flights of Soyuz-Fregat on February 9, 2000 and March 20, 2000, the Cluster 2 satellites were launched on July 16, 2000 and August 9, 2000. Another Soyuz-Fregat launched the ESA's Mars Express probe from Baikonur in June 2003. Now the Soyuz-Fregat launcher is used by Starsem for commercial payloads.

Soyuz-FG erected at the Baikonur Cosmodrome launch pad 1/5 Gagarin's Start (October 2008)

ISS crew transport[edit]

Between February 1, 2003 and July 26, 2005 with the grounding of the U.S. Space Shuttle fleet, Soyuz was the only means of transportation to and from the International Space Station. This included the transfer of supplies, via Progress spacecraft, and crew changeovers. Since the retirement of the Space Shuttle fleet in 2011, the U.S. space program is without any means to take astronauts into orbit, and NASA is dependent on the Soyuz to send crew into space for the immediate future.^[4] NASA is scheduled to resume crewed flights from the United States in late 2018 or 2019 through the Commercial Crew Development program.

Recent incidents[edit]

A long string of successful Soyuz launches was broken on October 15, 2002 when the uncrewed Soyuz U launch of the Photon-M satellite from Plesetsk fell back near the launch pad and exploded 29 seconds after lift-off. One person from the ground crew was killed and eight injured.

Another failure occurred on June 21, 2005, during a Molniya military communications satellite launch from the Plesetsk launch site, which used a four-stage version of the rocket called Molniya-M. The flight ended six minutes after the launch because of a failure of the third stage engine or an unfulfilled order to separate the second and third stages. The rocket's second and third stages, which are identical to the Soyuz, and its payload (a Molniya-3K satellite) crashed in the Uvatski region of Tyumen (Siberia).^[5]

On August 24, 2011, an uncrewed Soyuz-U carrying cargo to the International Space Station crashed, failing to reach orbit. On December 23, 2011 a Soyuz-2.1b launching a Meridian-5 military communications satellite failed in the 7th minute of launch because of an anomaly in the third stage.^[6]

On October 11, 2018, the Soyuz MS-10 mission to the International Space Station failed to reach orbit after an issue with the main booster. The launch escape system was used to pull the Soyuz spacecraft away from the malfunctioning rocket. The two crew, Aleksey Ovchinin and Nick Hague, followed a ballistic trajectory and landed safely over 400km downrange from the Baikonur Cosmodrome.

Soyuz-2 and Guiana spaceport[edit]

Soyuz 2 ready to launch (2007)

The venerable Soyuz launcher is gradually being replaced by a new version, now named Soyuz/ST (or Soyuz-2), which has a new digital guidance system and a highly modified third stage with a new engine. The first development version of Soyuz 2 called Soyuz-2-1a, which is already equipped with the digital guidance system, but is still propelled by an old third stage engine, started on November 4, 2004 from Plesetsk on a suborbital test flight, followed by an orbital flight on October 23, 2006 from Baikonur. The fully modified launcher (version Soyuz-2-1b) flew first on December 27, 2006 with the CoRoT satellite from the Baikonur Cosmodrome.

On 19 January 2005, the European Space Agency and the Russian Federal Space Agency agreed to launch Soyuz/ST rockets from the Guiana Space Centre.^[7] The equatorial launch site allows the Soyuz to deliver 2.7 to 4.9 tonnes into sun-synchronous orbit, depending on the third-stage engine used.^[8] Construction of a new pad started in 2005 and was completed in April 2011. The pad used vertical loading common at Guiana, unlike the horizontal loading used at the Baikonur Cosmodrome.^[9] A simulated launch was conducted in early May 2011.^[10] The first operational launch happened on 21 October 2011, bearing the first two satellites in Galileo global positioning system.

The Soyuz-U and Soyuz-FG rockets are gradually being replaced by Soyuz-2 from 2014 onwards. Soyuz-U was retired in 2017,^[11] while Soyuz-FG still carries astronaut crews to the ISS as of 2018^[update].

Variants[edit]

• Soyuz 11A511 (1966-1975)
• Soyuz-L 11A511L (1970-1971)
• Soyuz-M 11A511M (1971-1976)
• Soyuz-U 11A511U (1973-2017)
• Soyuz-U2 11A511U2 or 11A511K (1982-1995)
• Soyuz-FG 11A511U-FG (2001-today)
• Soyuz-2 14A14 (2006-today)

The Molniya-M (1964-2010) was also derived from the Soyuz family.

Assembly[edit]

Soyuz rocket assembly: the first and second stages are in the background, already joined together; the third stage is in the lower left corner of the image. The Soyuz spacecraft, covered by its launch shroud, is in the lower right corner.

The rocket is assembled horizontally in the Assembly and Testing Building. The assembled rocket is transported to the launch site in its horizontal state and then raised. This is different from the vertical assembly of, for example, the Saturn V, and is one of the features that makes Soyuz cheaper^{[citation needed]} to prepare for launch.

Assembling a horizontally positioned rocket is relatively simple as all modules are easily accessible. Assembling the rocket in vertical position would require a windproof high-rise hangar, which was not considered financially feasible at the time the rocket was designed, due to the failing economy of the Soviet Union.

Prelaunch[edit]

Soyuz TMA-13 being erected at the Gagarin's Start launch pad, October 10, 2008.

The entire rocket is suspended in the launch system by the load-bearing mechanisms on the strap-on boosters where they are attached to the central core. The latter rests on the nose sections of the strap-on boosters. This scheme resembles flight conditions when the strap-on boosters push the central core forward. The concept of suspending the rocket was one of the novelties introduced with the R-7/Soyuz.

Since the launch pad has been eliminated, the bottom portion of the rocket is lowered. The launch system trusses bear the wind loads. Resistance to high wind is an important feature of the launch system, as the Kazakhstan steppes, where the Baikonur launch site is located, are known for windstorms.

Launch[edit]

A Soyuz-U on the launch pad, ahead of the Soyuz 19 (ASTP) launch on 15 July 1975

The engines are ignited by electrically initiated pyrotechnic flares, mounted on birch poles, which are ignited at approximately T-20, a few seconds before fuel components are introduced into the combustion chamber.^[12] This sequence rarely fails due to its simplicity.^[13] During launch, the support booms track the movement of the rocket. After the support boom heads emerge from the special support recess in the nose sections of the strapons, the support booms and trusses disconnect from the rocket airframe, swiveling on the support axes and freeing the way for the rocket to lift off. During launch, the rocket and the launch facility form a single dynamic system.

When the strapon booster engines stop, the boosters fall away, providing nonimpact separation. If the skies are clear, ground observers can see a Korolev cross formed by the falling boosters.

Fairings used for uncrewed missions[edit]

The Soyuz launch vehicle is used for various Russian uncrewed missions and is also marketed by Starsem for commercial satellite launches. Presently the following fairing types are used:

Progress is the cargo spacecraft for uncrewed missions to the ISS and previously to Mir. The spacecraft uses a dedicated platform and fairing and can be launched with either Soyuz-U, Soyuz-FG or Soyuz-2.^{[citation needed]}

A-type fairing is used for commercial launches.^{[citation needed]}

S-type fairing is used for commercial launches by Starsem. The fairing has external diameter of 3.7 m and a length of 7.7 m. The Fregat upper stage is encapsulated in the fairing with the payload and a payload adapter/dispenser.^[14] S-type fairing along with Fregat upper stage were used to launch the following spacecraft: Galaxy 14, GIOVE A, Mars Express, AMOS-2, Venus Express, Cluster.^[15]

SL-type fairing is used for commercial launches by Starsem. The fairing has external diameter of 3.7 m and a length of 8.45 m. The Fregat upper stage is encapsulated in the fairing with the payload and a payload adapter/dispenser.^[16] SL-type fairing along with Fregat upper stage were used to launch the following spacecraft: COROT.^{[citation needed]}

ST-type fairing is used for commercial launches by Starsem. Its external diameter is 4.1 m and its length is 11.4 m. It can be used with the Soyuz-2 only, because older analog control system cannot cope with aerodynamic instability introduced by a fairing this large. This carbon-plastic fairing is based on the proven configuration used for Arianespace’s Ariane 4 vehicles, with its length increased by approximately one additional meter.^[17] The fairing has been developed and is being manufactured by TsSKB-Progress in accordance with the requirements of a customer (Starsem). This is the only fairing type offered by Starsem/Arianespace for launches from Kourou.^[18]

Stages[edit]

Exploded plan of Soyuz FG rocket

First stage[edit]

The first stage hauling a crew up to ISS, 2006

The first stage of Soyuz rockets consists of four identical conical liquid booster rockets, strapped to the second stage core. Each booster has a single rocket motor with four combustion chambers, two vernier combustion chambers, and one set of turbopumps.

Statistics (each of 4 boosters)^{[citation needed]}

• Gross mass: 44.5 t (98,100 lb)
• Propellant: 39.2 t (86,400 lb)
• Dry mass: 3,784 kg (8,342 lb)
• Diameter: 2.68 m (8 ft 10 in)
• Length: 19.6 m (64 ft 4 in)
• Burn time: 118 s
• Engines:
  • Soyuz and Soyuz-U models
    • RD-107
      • Thrust 813 kN (183 klb_f) at liftoff
      • Thrust 991 kN (223 klb_f) in vacuum
      • Specific impulse 245 seconds (2.40 km/s) at liftoff
      • Specific impulse 310 seconds (3.0 km/s) in vacuum
      • Chamber pressure 5.85 MPa (848 psi)
  • Soyuz-ST models
    • RD-107A (14D22)
      • Thrust 838 kN (188 klb_f) at liftoff
      • Thrust 1021 kN (230 klb_f) in vacuum
      • Specific impulse 245 seconds (2.40 km/s) at liftoff (est)
      • Specific impulse 310 seconds (3.0 km/s) in vacuum (est)
      • Chamber pressure 5.85 MPa (848 psi)
  • Soyuz-FG
    • RD-107A (14D22)
      • Thrust 775 kN (174 klb_f) at liftoff
      • Specific impulse 320.2 seconds (3.140 km/s) in vacuum

Second stage[edit]

Here the four first stage boosters fall away, creating a cross smoke pattern in the sky, also known as a Korolev cross.

The second stage of the Soyuz booster is a single, generally cylindrical stage with one motor at the base and is activated with the first stage. Like each of the first-stage rockets, it also has four combustion chambers and one set of turbopumps, but four (instead of two) vernier combustion chambers. The second stage tapers toward the bottom to allow the four first-stage rockets to fit more closely together.

• Gross mass: 105.4 t (232,400 lb)
• Propellant: 95.4 t (210,000 lb)
• Propellant (Soyuz-U2 with Syntin propellant): 96.4 t (212,000 lb)
• Dry mass: 6,875 kg (15,160 lb)
• Length: 28 m (91 ft 10 in)
• Diameter: 2.95 m (9 ft 8 in)
• Burn time: 290 s
• Engines:
  • Soyuz and Soyuz-U models
    • RD-108
      • Thrust 779 kN (175 klb_f) at liftoff
      • Thrust 997 kN (224 klb_f) in vacuum
      • Specific impulse 264 seconds (2.59 km/s) at liftoff
      • Specific impulse 311 seconds (3.05 km/s) in vacuum
      • Chamber pressure 5.1 MPa (740 psi)
  • Soyuz-U2 model with Syntin fuel
    • RD-108
      • Thrust 811 kN (182 klb_f) at liftoff
      • Thrust 1009 kN (227 klb_f) in vacuum
      • Specific impulse 264 seconds (2.59 km/s) at liftoff
      • Specific impulse 311 seconds (3.05 km/s) in vacuum
      • Chamber pressure 5.1 MPa (740 psi)
  • Soyuz-ST models
    • RD-118 (11D512)
      • Thrust 792 kN (178 klb_f) at liftoff
      • Thrust 990 kN (222 klb_f) in vacuum
      • Specific impulse 264 seconds (2.59 km/s) at liftoff (est)
      • Specific impulse 311 seconds (3.05 km/s) in vacuum (est)
      • Chamber pressure 5.85 MPa (848 psi)

Third stage[edit]

One of the common payloads of the Soyuz rocket family, a Soyuz spacecraft. This one is for an international docking mission with Apollo spacecraft of the USA

There are two variant upper stages in use, the Block I and Improved Block-I (used in Soyuz-2-1b).

• Gross mass: 25.2 t (55,600 lb)
• Propellant: 21.4-22.9 t (47,200–50,500 lb)
• Dry mass: 2355 kg (5190 lb)
• Length: 6.7 m (22 ft 0 in)
• Diameter: 2.66 m (8 ft 9 in)
• Burn time: 240 s
• Engine:
  • Block I
    • RD-0110
    • Thrust 298 kN (67.0 klb_f)
    • Specific impulse 330 seconds (3.2 km/s)
    • Chamber pressure 6.8 MPa (986 psi)
  • Improved Block I
    • RD-0124 (11D451)
    • Thrust 294 kN (66 klb_f)
    • Specific impulse 359 seconds (3.52 km/s)
    • Chamber pressure 16.2 MPa (2350 psi)

See also[edit]

• Comparison of orbital launchers families
• List of R-7 launches, including launches of the Soyuz rocket family

References[edit]

Further reading[edit]

• International Reference Guide to Space Launch Systems, Third Edition, Iaskowitz, Hopkins, and Hopkins ed., 1999, Reston, Virginia, AIAA Publications. ISBN 1-56347-353-4

External links[edit]

• Starsem
• Soyuz launch log at Starsem
• Soyuz U/Fregat
• Soyuz launch vehicle: The most reliable means of space travel
• Soyuz Booster Family
• Soyuz User's Manual - Arianespace