Almaz

The Almaz (Алмаз, "Diamond") program was a highly secretive Soviet military space station program, began in the early 1960s.

Three crewed military reconnaissance stations were launched between 1971 and 1974: Salyut 2, Salyut 3 and Salyut 5. To cover the military nature of the program the three launched Almaz stations were designated as civilian Salyut space stations. Salyut 2 failed shortly after achieving orbit, but Salyut 3 and Salyut 5 both conducted successful manned testing. Following Salyut 5, the Soviet Ministry of Defence judged in 1978 that the time consumed by station maintenance outweighed the benefits relative to automatic reconnaissance satellites.

The space stations cores were known internally as OPS (ОПС, GRAU index 11F71 and 11F71B), from "Orbital Piloted Station" (Орбитальная Пилотируемая Станция). As part of the Almaz program several spacecraft for supportive roles were developed: The VA spacecraft, the Functional Cargo Block and  the TKS spacecraft, which were to be used in several combinations. The heritage of the Almaz program continues to this day with the ISS module Zarya being one example.

Development
Almaz had been promoted by Vladimir Chelomei at the OKB-52 design bureau as a response to the US Air Force's Manned Orbiting Laboratory (MOL) project – MOL had been widely published in the early 1960s in the US press, which provided plenty of material for Chelomei to lobby for a Soviet response to this perceived US threat.

The Almaz space station programme consisted of three major parts:
 * The Orbital Piloted Station (OPS, 11F71) module that formed the space station itself.
 * The Functional Cargo Block (FGB, 11F77), intended as resupply craft for the stations.
 * The VA spacecraft (11F74, known in the West as the Merkur spacecraft), which was intended as a launch and return vehicle for the crew. It was intended to either launch the crew in a VA spacecraft together with an Almaz-OPS space station, or together with an FGB resupply craft – the later combination of VA and FGB would form the TKS spacecraft (11F72).

Much like its counterpart MOL/Gemini, the initial Almaz APOS space station design would call for an Almaz-OPS space station to be launched together with its initial three man crew in a VA return capsule, mated together as OPS/VA atop Chelomei's UR-500 Proton rocket. Once in orbit, and same as MOL/Gemini, 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 reusable VA return vehicle – the capsule would have been reusable for a total of up to 10 flights. The OPS basic design features are 4.15 m in diameter, a weight of roughly 20 t and 90 m3 total pressurized volume.

Unlike the American MOL design, the Almaz was designed to be recrewed and resupplied. For this the TKS resupply craft was created, which would be launched with the crew in its VA return craft – the launch vehicle would be again a Proton rocket. At the station, one docking port was available to receive the TKS craft, once the previous crew had left the station with their VA capsule.

While the MOL was canceled in 1969, the Almaz program would be integrated into the Salyut programme and result 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 with a Soyuz rocket and a modified Soyuz spacecraft. Plans called for the first three Almaz stations to be visited by 3 two-month-long expeditions each. This was realized fully by two missions and partially with one; however, the initial intention of launching Almaz APOS and the TKS spacecraft together with its crew in VA spacecraft would never materialize during the program, and neither would the TKS craft play a role as the intended resupply craft. The Almaz APOS design – without VA spacecraft – would evolve into the Almaz OPS station cores of the Salyut programme.

Defense measures
In addition to reconnaissance equipment, Almaz was equipped with a unique 23mm 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 the Tu-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 had supply of 32 rounds and was tested at the end of the mission, when the station was operating in unmanned mode. To aim the cannon, which was on a fixed mounting, the entire station would be turned to face the threat.

Salyut 3/OPS-2 conducted a successful remote test firing with the station unmanned 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.

Orbital Piloted Stations (OPS)
Three Almaz OPS space stations were flown from 1973 to 1976 in the Salyut programme: Salyut 2 (OPS-1), Salyut 3 (OPS-2) and Salyut 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 manned Almaz stations for a total of 81 days when the program was ended.

Besides the three flown space stations OPS-1 to OPS-3, seven more spaceframes of Almaz space stations had been build when the program was cancelled: OPS-4, Almaz-205, Almaz-206, Almaz-T, Almaz-T2 (Kosmos 1870), Almaz-1 and Almaz-2 – with Almaz-T2 and Almaz-1 having successfully flown as repurposed unmanned 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 which plans to launch these as manned space stations (see below).

OPS-1 (Salyut 2)
The first Almaz station (OPS-1 or Almaz 101.1), announced as Salyut 2, it was launched on April 3, 1973. For purposes of military secrecy, it was publicly designated Salyut 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.

OPS-2 (Salyut 3)
OPS-2 (or Almaz 101.2), announced as Salyut 3, was launched on June 25, 1974. The crew of the Soyuz 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 aircraft cannon at a target satellite while the station was unmanned. Salyut-3 was deorbited in January 1975.

OPS-3 (Salyut 5)
OPS-3 (or Almaz 103), announced after launch as Salyut 5, entered orbit on June 22, 1976. It was visited by two crews in the summer of 1976 and winter of 1977. Salyut 5 was deorbited on 8 August 1977, and broke up as it reentered the Earth's atmosphere.

OPS-4
The next Almaz station, OPS-4, was to be the first station launched with a three panel Mech-A Synthetic Aperture Radar and a manned reusable Return Vehicle VA, however the VA was replaced by a second TKS docking port. This station's Shchit-1 23 mm defense cannon was also to be replaced with an advanced Shchit-2 space-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 manned program was cancelled.

Almaz-T (unmanned)
Following cancellation of the program, the Almaz station was reconfigured as an unmanned heavy radar-carrying reconnaissance satellite. Three such satellites were launched, two of which functioned successfully in orbit.

Almaz-T
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.

Almaz-T2 (Kosmos 1870)
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, providing radar 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 of Excalibur Almaz), who worked in a company marketing the radar images gathered by the satellite.

Almaz-1
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 the Luch 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.

Almaz-2
Almaz-2 (Almaz-1V) - Not flown. It had a new radar which 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.

Heritage
The heritage of the Almaz space station program continues until today, and can even be found today in the International Space Station.

DOS space station cores
The DOS space station core modules were based on the Almaz-OPS hull design, which was mated by Sergei Korolev's organization OKB-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.

DOS space station cores derived since 1971 from the Almaz-OPS hull design include:
 * DOS-1, which formed the basis for Salyut 1 space station, in 1971 the first space station in the history of space flight
 * DOS-5 and DOS-6, the cores for the long lived Salyut 6 and Salyut 7 space stations
 * DOS-7, the Mir Core Module for the Mir space station, the first modular space station
 * DOS-8, the Zvezda "Service Module" for the International Space Station, still in use

Functional Cargo Block (FGB)
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. The FGB-based Kvant-1 module of the Mir space station was the first space station module of its kind, and the Zarya Functional Cargo Block, which is still in use on the International Space Station.

Excalibur Almaz
The private spaceflight company Excalibur Almaz has bought the two partially completed Almaz-205 and Almaz-206 space station hulls from the Russian NPO Mashinostroyeniya (the former OKB-52) with the stated intention to outfit and launch them. 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.

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 of space 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.

Excalibur Almaz has postponed its first launch to 2015 to be able to include more lucrative deep space capabilities like asteroid mining.