Salyut programme

• 1. Origins And Design Competition

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  In August 1969, engineers at OKB-1 began merging two distinct space station designs into a single project. Vladimir Chelomey's NPO Mashinostroyeniya had created the Almaz-OPS hull as a military reconnaissance platform in October 1964. Sergei Korolev's OKB-1 organization developed the civilian DOS core to support long-term human habitation. These two bureaus had been fierce rivals during the Soviet crewed lunar programme era. The fusion of their technologies required small modifications to the docking port of the OPS module to accommodate Soyuz spacecraft alongside TKS spacecraft. This collaboration allowed the Salyut programme to begin on the 15th of February 1970 under specific conditions regarding the lunar program. Engineers at OKB-1 viewed the L3 lunar lander effort as a dead-end and immediately switched focus to DOS development. The actual time from the DOS station's inception to the launch of the first DOS-based Salyut 1 took only 16 months. The world's first space station was launched by the Soviet Union two years before the American Skylab or the first Almaz/OPS station flew.

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• 2. First Generation Engineering Tests

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  Salyut 2 became Kosmos 557 after its launch failure on the 4th of April 1973. The station reentered Earth's atmosphere just nine hours later, marking a significant engineering setback for the early programme. Salyut 3 served as a military reconnaissance platform designated OPS-2 when it launched on the 25th of June 1974. During this mission span, cosmonauts fired an onboard 23mm cannon reported to be a modified Nudelman aircraft weapon. To operate the cannon, the crew had to maneuver the entire space station in the direction of their target. Sources state that the firing was intended to deplete ammunition on the craft while others suggest three tests occurred throughout the mission. Salyut 4 achieved 924 days in orbit starting from the 26th of December 1974, setting new duration records for civilian stations. These early missions functioned primarily as engineering test beds rather than fully operational research facilities. The first generation received few craft for rendezvous and docking compared to later iterations. Salyut 5 operated from the 22nd of June 1976 until the 8th of August 1977, continuing the pattern of short-duration military operations.

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• 3. Second Generation Long Duration Habitation

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  Salyut 6 launched on the 29th of September 1977 with revolutionary changes enabling continuous human occupation. The station featured a second docking port at the aft section allowing two Soyuz spacecraft to dock simultaneously. This configuration permitted crew exchanges and station handovers without breaking orbital continuity. An uncrewed Progress resupply craft was created based on the crewed Soyuz design to deliver air regenerators, water, food, clothing, bedding, mail, propellants, and pressurant supplies. While the Progress docked to the station's second port, the crew's Soyuz spacecraft remained attached to the first port. The Progress spacecraft even delivered hardware for updating onboard experiments and permitting repairs to extend station life. Out of 1,697 total days of occupancy across all Salyut crews, Salyut 6 and 7 accounted for 1,499 days combined. These stations became the workhorses of the entire programme through their dual-port architecture. Salyut 7 followed in April 1982 and maintained operations until February 1991, accumulating 816 days in orbit.

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• 4. Military Cover And Secret Operations

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  The Soviet Union utilized civilian stations as cover for the highly secretive military Almaz reconnaissance program. Two crewed military reconnaissance space stations flew under the standard Salyut designation throughout the programme. The Almaz-OPS space station cores were originally designed by Vladimir Chelomey's organization in October 1964 as dedicated military platforms. Small modifications had to be made to the docking port of the OPS module to accommodate Soyuz spacecraft in addition to TKS spacecraft. This arrangement allowed the civilian DOS stations to offer a cover story while finishing within one year and at least a year earlier than pure Almaz designs. Salyut 3 conducted the first test-fire of a conventional weapon in space during its mission span from June 1974 to January 1975. Cosmonauts fired an onboard 23mm cannon which was reported to be a modified Nudelman aircraft weapon. Sources indicate the firing was intended to deplete ammunition on the craft or represent three separate tests throughout the mission. The heritage from the Almaz programme remained present even after the last Almaz station flew as Salyut 5 in 1976.

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• 5. Legacy In Mir And The ISS

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  DOS-7 evolved into the Mir Core Module for the Mir space station that followed the Salyut programme. Crewed operations lasted from 1986 to 2000 with upgraded computers and solar arrays supporting two cosmonauts each having their own cabin. A total of six docking ports were available on the Mir Core Module used for space station modules and visiting spacecraft. The docking sphere design had been upgraded from its initial Salyut design to contain a maximum of five docking ports including front, port, starboard, zenith and nadir. DOS-8 became the International Space Station Zvezda Service Module forming the core of early ISS together with the Zarya module. The Functional Cargo Block space station modules derived from the Almaz programme formed the basis for several Mir modules and the experimental Polyus orbital weapons platform. The Russian Federation faced severe difficulties following the Soviet Union's dissolution in December 1991 when imports and exports steeply declined. Economic exchange with Comecon nations crumbled away leaving the industry of the former Soviet Union in shambles. Parts of the Soviet space industry were located in newly independent Ukraine which started to demand hard currency for contributions. The Shuttle-Mir program established between Russia and the United States in 1993 represented cooperation between former adversaries.

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