TheAlmaz (Russian:Алмаз,lit. 'Diamond') program was a highly secretSoviet militaryspace station program, begun in the early 1960s.
Three crewed militaryreconnaissance stations were launched between 1973 and 1976:Salyut 2,Salyut 3 andSalyut 5. To cover the military nature of the program, the three launched Almaz stations were designated as civilianSalyut space stations.Salyut 2 failed shortly after achieving orbit, but Salyut 3 and Salyut 5 both conducted successful crewed testing. Following Salyut 5, theSoviet Ministry of Defense judged in 1978 that the time and resources consumed by station maintenance outweighed the benefits relative to automaticreconnaissance satellites. Still, it had some achievements along with Salyut program, the heritage of the twin program continues, with theISS moduleZarya being one example.[vague][not verified in body]
The space stations' cores were known internally as OPS (Russian:ОПС,GRAU index 11F71 and 11F71B), from "Orbital Piloted Station" (Russian:Орбитальная Пилотируемая Станция).[1] As part of the Almaz program, the Soviets developed several spacecraft for support roles—theVA spacecraft, theFunctional Cargo Block and theTKS spacecraft—which they planned to use in several combinations.[2][3]
Vladimir Chelomei at theOKB-52 design bureau promoted Almaz as a response to the US Air Force'sManned Orbiting Laboratory (MOL) project. MOL had been widely publicized in the US press in the early 1960s, which provided Chelomei plenty of material to use to lobby for a Soviet response.[citation needed]
The Almaz space station programme involved three major hardware components:
The OPS would have a maximum diameter of 4.15 metres (13.6 ft), a mass of roughly 20 tonnes (20 long tons; 22 short tons), and an internal habitable volume of 47.5 cubic metres (1,680 cu ft).[1]
Much like itsMOL/Gemini counterpart, the initial Almaz APOS space station design called for the launch of an Almaz-OPS space station and aVA return capsule containing its initial three man crew, mated together as OPS/VA atop Chelomei's UR-500Proton rocket.[3] As with MOL/Gemini, once in orbit the crew would access the lab through a hatch in the heat shield at the bottom of the VA capsule.After an extended stay of 30 to 60 days of military observation and photography the crew would return to Earth by way of a VA return vehicle.[4][5]
Unlike the American MOL design, the Soviets designed the Almaz to be recrewed and resupplied. For this, they created theTKS resupply craft (11F72), which consisted of an FGB and aVA return craft to carry the crew, also launched together on a Proton rocket. At the station, onedocking port would be available to receive the TKS craft once the previous crew had left the station in their VA capsule.[2]
While the MOL was cancelled in 1969, the Almaz program was integrated into theSalyut programme and resulted in three flown space stations, two of which were crewed successfully. As "man-rating" the VA spacecraft and the Proton rocket took longer, the first phase called for the launch of three Almaz stations without the VA spacecraft, with the crew instead launched separately by Soyuz rocket in a modified Soyuz spacecraft. Plans called for the first three Almaz stations to be visited by three two-month-long expeditions each. This was realized fully by two missions and partially by one; however, the initial intention of launching Almaz APOS and theTKS spacecraft together with its crew inVA spacecraft would never materialize during the program, and neither would the TKS craft play its intended role as resupply craft. The Almaz APOS design, without VA spacecraft, would evolve into the Almaz OPS station cores of the Salyut programme.[6]
In addition to reconnaissance equipment, Almaz was equipped with a unique23mm Rikhter (factory index 261P or 225P) rapid-fire cannon mounted on the forward belly of the station. This revolver cannon was modified from the tail-gun of theTu-22 bomber and was capable of a theoretical rate of fire of 1800-2000 (up to 2600) rounds per minute. Each 168 gram (ammo 23-OFZ-D-R ) or 173 gram (ammo 23-OFZ-G-R) projectile flew at a speed of 850 m/s relative to the station. The cannon was tested at the end of the mission by firing 20 rounds, when the station was operating in uncrewed mode. To aim the cannon, which was on a fixed mounting, the entire station would be turned to face the target.[7] The Almaz series are the only known armed, crewed military spacecraft ever flown.
Salyut 3/OPS-2 conducted a successful remote test firing with the station uncrewed due to concerns over excessive vibration and noise.
OPS-4 was to have featured two rockets instead of the aircraft cannon, but this system has not been shown publicly and may have never been fully manufactured despite it being used experimentally.[citation needed]
Three Almaz OPS space stations were flown from 1973 to 1976 in theSalyut programme:Salyut 2 (OPS-1),Salyut 3 (OPS-2) andSalyut 5 (OPS-3).Five crewed Soyuz expeditions were flown to the Almaz space stations Salyut 3 and Salyut 5, with three reaching their stations and only two of the missions being considered fully successful at that time – the three crews that had reached their stations had crewed Almaz stations for a total of 81 days when the program was ended.[6][8]
Besides the three flown space stations OPS-1 to OPS-3, seven more spaceframes of Almaz space stations had been built when the program was cancelled: OPS-4, Almaz-205, Almaz-206,Almaz-T, Almaz-T2 (Kosmos 1870),Almaz-1 andAlmaz-2 – with Almaz-T2 and Almaz-1 having successfully flown as repurposed uncrewed radar-carrying reconnaissance satellites (see below). The partially outfitted hulls of Almaz-205 and Almaz-206 are today in the property of Excalibur Almaz, a company that plans to launch these as crewed space stations (see below).[9]
The first Almaz station (OPS-1 or Almaz 101.1) was launched on April 3, 1973. For purposes of military secrecy, it was publicly designatedSalyut 2 upon reaching orbit. A crew was prepared to fly to the station but an accident days after the launch left OPS-1 disabled and depressurized.[10]
OPS-2 (or Almaz 101.2), announced asSalyut 3, was launched on June 25, 1974. The crew of theSoyuz 14 spacecraft spent 15 days aboard the station in July 1974. A second expedition was launched toward OPS-2 in August 1974, but failed to reach the station. The station successfully remotely test-fired an onboard aircraftcannon at a target satellite while the station was uncrewed. Salyut-3 was deorbited in January 1975.[8]
OPS-3 (or Almaz 103), announced after launch asSalyut 5, entered orbit on June 22, 1976. It was visited by two crews in mid-1976 and late 1977. Salyut 5 was deorbited on 8 August 1977, and broke up as it reentered the Earth's atmosphere.[11]
The next Almaz station, OPS-4, was to be the first station launched with a three panelMech-Asynthetic-aperture radar and a crewed reusable Return VehicleVA, however the VA was replaced by a second TKS docking port. This station'sShchit-1 23 mm defensecannon was also to be replaced with an advanced Shchit-2space-to-space cannon. The Shchit-2 was reported to be a two projectile system, although no photographs of it have ever been published and it does not appear that this system was ever installed on the station. OPS-4 was grounded when the Almaz crewed program was cancelled.
Following cancellation of the program, the Almaz station was reconfigured as an uncrewed heavy radar-carryingreconnaissance satellite. Three such satellites were launched, two of which functioned successfully in orbit.[12]
Almaz-T – The first Almaz-T blasted off from Baikonur on October 29, 1986. It did not reach orbit due to the failure of the first and second stages of the Proton launcher to separate. The safety system then destroyed the vehicle.
Kosmos 1870 – On July 25, 1987, Almaz-T2, the second Almaz-T spacecraft, successfully reached orbit with an inclination 71.92 degrees toward the Equator and it was officially identified as Kosmos-1870. The spacecraft functioned for two years, providingradar imagery with a resolution down to 25 meters, until it was deorbited on July 30, 1989.
It was the first commercial radar satellite, according to Art Dula (chairman ofExcalibur Almaz), who worked in a company marketing the radar images gathered by the satellite.[13]
Almaz-1 – The third Almaz-T spacecraft was launched on March 31, 1991, under the name Almaz-1. After the launch a failure of the communications antenna designed to downlink the imagery via theLuch relay satellite was noted. Also one of the solar panels failed to deploy completely, leaving the main radar panel of the spacecraft partially blocked. After 18 months of successful work the Almaz-1 was deorbited on October 17, 1992, over the Pacific Ocean.[clarification needed]
Almaz-2 (Almaz-1V) – Not flown. It had a new radar that would have provided a resolution of 5 to 7 meters. In addition, an optical-electronic payload on the station would have been capable of producing imagery with a resolution of 2.5 – 4 meters.
The heritage of the Almaz space station program continues until today, and can even be found today in theInternational Space Station and in theTianhe core module of theTiangong space station.
The DOS (Durable Orbital Station) space station core modules were based on the Almaz-OPS hull design, which was mated bySergei Korolev's organizationOKB-1 with their own Soyuz-derived subsystems. OKB-1 was at that time in competition with the designer of the Almaz, Vladimir Chelomei's organization OKB-52, and was thereby able to short-cut the development time for the first space station and beat OKB-52, which had started design work much earlier.[14]
DOS space station cores derived since 1971 from the Almaz-OPS hull design include:
The FGB was a standalone spacecraft which was intended to function as a resupply craft for the Almaz space stations. The 'functional' section of the name is representative of the fact that the FGB provided electrical power, propulsion, guidance, and docking. Cargo was presented as a large cargo bay accessible by the crew, as well as external fuel tanks. Other types of FGB existed, as it was a broad classification rather than a specific type of module. FGB-based vehicles include Transport Logistics Spacecraft (Russian Acronym: TKS) (1976-1983), Space Station modules (1985-present), and space tugs (1987-present)[15]
The modules based on the DOS design are not the only heritage of the Almaz program still in use: The habitat, propulsion and service module of the TKS spacecraft, the so-called Functional Cargo Block (FGB), went on to become the core of many Soviet and Russian space station modules.[2] The FGB-basedKvant-1 module of the Mir space station was the first space station module of its kind, and theZarya Functional Cargo Block, which is as of 2018[update] still in use on theInternational Space Station.
Theprivate spaceflight companyExcalibur Almaz bought the two partially completed Almaz-205 and Almaz-206 space station hulls from the RussianNPO Mashinostroyeniya (the former OKB-52) with the stated intention to outfit and launch them.[16][17][18][19][20]The Almaz-205 module is similar to the OPS-2 of the Salyut 3 station, while the Almaz-206 is closer to the OPS-3 of the Salyut 5 station.[21]
In addition, Excalibur Almaz acquired four VA return capsule hulls (derived from the TKS/VA spacecraft) and plans to outfit and launch them as well: one is planned to be used in support ofspace tourism while the other three capsules are reserved for scientific and commercial payloads. The needed development of propulsion systems for the VA capsule was reportedly delegated to an unnamed European organization as early as 2009.[18]
Excalibur Almaz as of January 2012[update] postponed its first launch to 2015 to be able to include more lucrative deep space capabilities likeasteroid mining.[22] However, in 2015 the company was reported to be in problems, and it was not clear what happened to their spacecraft.[23]
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Notes: † Never inhabited due to launch or on-orbit failure, ‡ Part of theAlmaz military program, ° Never inhabited, lacks docking mechanism. | |||||||||
