Universal Rocket

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The Universal Rocket or UR family of missiles and carrier rockets is a Russian, previously Soviet rocket family. Intended to allow the same technology to be used in all Soviet rockets, the UR is produced by the Khrunichev State Research and Production Space Center. Several variants were originally planned, of which only three flew, and only two of which entered service. In addition, the cancelled UR-500 ICBM formed the basis for the Proton carrier rocket.

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UR-100

The UR-100 and its variants (e.g. UR-100N) were the standard small ICBM of the Soviet Union during the Cold War. Only the UR-100N (NATO reporting designation: SS-19 Stiletto) remains in active duty, with 20–30 missiles operational. [1] The Strela and Rokot carrier rockets are based on the UR-100N. A number of UR-100Ns have been earmarked for use as launch vehicles for the Avangard maneuverable reentry vehicle. [2]

UR-200

The UR-200 was intended to be a larger ICBM that could also be used as a carrier rocket. Nine test flights were made between 4 November 1963, and 20 October 1964, before the program was cancelled in favor of Mikhail Yangel's R-36 missile and Tsyklon carrier rocket derivative. [3]

UR-500

The UR-500 was designed to be a very large ICBM, with the throw-weight necessary to deliver the 50-100 megaton Tsar Bomba like warhead. [4] Under pressure from Khrushchev, the UR-500 was reworked as a space launcher, and eventually renamed the Proton, the latest version of which is still in service as of 2023. [5]

UR-700

UR-700 Kaluga Wikiexpedition (2016-06-11) 0472.jpg
UR-700

The UR-700 was Vladimir Chelomei's heavy-lift entry for the Soviet moonshot. It was meant to carry cosmonauts to the Moon on a direct ascent mission in the LK-1 lunar craft. Sergei Korolev's N1 booster and Soyuz 7K-LOK / LK Lander were chosen instead for the mission, and it never left the drawing board. It would have had a payload capacity to low Earth orbit of 151 metric tons. [6]

Superficially, the UR-700 was of the well-known design of Soviet launchers with a central core stack and lateral strap-on boosters. But one distinguishing feature was that the engines of the first stage were cross-fed with fuel and oxidizer from the tanks of the strap-on boosters during the initial flight phase. This meant that when the boosters were spent and jettisoned, the central stack still flew with full tanks, thus reducing dead weight and increasing a possible payload. [7]

A nuclear variant known as the UR-700A was also designed to have a much larger payload capacity of 750t (1,500,000 lb) to LEO. [8]

UR-900

The UR-900 was the ultimate Universal Rocket application, a super heavy-lift launch vehicle for crewed expeditions to other planets, especially Mars. Proposed in 1969, it would have had 15 RD-270 modules in the first and second stages, and the third and fourth stages were based on those of the UR-500. The UR-900 would have stood 90 metres (295 ft) tall, had a liftoff thrust of 94,000 kN (21,132,000 lbf), and be able to place 240 tons into low Earth orbit. Like the UR-700, it remained a paper project only. [9]

See also

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References

  1. Kristensen, Hans M.; Norris, Robert S. (2018). "Russian nuclear forces, 2018". Bulletin of the Atomic Scientists. 74 (3): 185–195. Bibcode:2018BuAtS..74c.185K. doi: 10.1080/00963402.2018.1462912 .
  2. "Russia to use SS-19 ICBMs as carriers for Avangard hypersonic glide vehicles – source".
  3. Boris Chertok. Rockets and People: Volume IV THe Moon Race (PDF) (Report). NASA. p. 21. Retrieved 7 May 2023.
  4. Mark Wade. "Proton". Astronautix.com. Archived from the original on 20 August 2016.
  5. Mooney, Justin (2 March 2023). "Russian Elektro-L weather satellite launched on Proton-M". NASASpaceFlight . Retrieved 2 March 2023.
  6. "UR-700". Archived from the original on 20 August 2016.
  7. "UR-700". Archived from the original on 20 August 2016.
  8. "UR-700M". www.astronautix.com. Archived from the original on 26 July 2016. Retrieved 10 October 2019.
  9. "UR-900". Archived from the original on 28 August 2016.

Further reading