|Role:||Used to supply the International Space Station, originally used to supply Soviet and Russian space stations (see Mir)|
|Height:||7.23 m (23.72 ft)|
|Diameter:||2.72 m (8.92 ft)|
|Volume:||7.6 m3 (268 ft3)|
|Payload:||2,350 kg (5,200 lb)|
|Endurance:||6 months docked to station|
The Progress (Russian: Прогресс) is a Russian expendable freighter spacecraft. The spacecraft is an unmanned resupply spacecraft during its flight but upon docking with a space station, it allows astronauts inside, hence it is classified manned by the manufacturer. It was derived from the Soyuz spacecraft, and is launched with the Soyuz rocket. It is currently used to supply the International Space Station, but was originally used to supply Soviet space stations for many years. There are three to four flights of the Progress spacecraft to the ISS per year. Each spacecraft remains docked until shortly before the new one, or a Soyuz (which uses the same docking ports) arrives. Then it is filled with waste, disconnected, deorbited, and destroyed in the atmosphere. Because of the different Progress variants used for ISS, NASA uses its own nomenclature where "ISS 1P" means the first Progress spacecraft to ISS.
It has carried fuel and other supplies to all the space stations since Salyut 6. The idea for the Progress came from the realisation that in order for long duration space missions to be possible, there would have to be a constant source of supplies. It had been determined that a cosmonaut needed consumables (water, air, food, etc.) plus there was a need for maintenance items and payloads for experiments. It was impractical to launch this along with passengers in the small space available in the Soyuz.
Progress is of much the same size and shape as Soyuz. It consists of three modules:
- A pressurized forward module. This carries the supplies for the crew such as scientific equipment, clothes, prepackaged and fresh food, and letters from home. The docking drogue is similar to that of the Soyuz but features ducting for the UDMH fuel and N2O4 oxidiser.
- A fuel compartment. The reentry module of the Soyuz was replaced with an unpressurized propellant and refueling compartment with ducting along the outside of the spacecraft. This meant that if a leak occurred, the poisonous gas would not enter the station's atmosphere. The fuel is carried in two tanks.
- A propulsion module. The propulsion module, at the rear of the spacecraft, remained unchanged and contains the orientation engines used for the automatic docking. It may be used to boost the orbit of the station once docked.
Reduction in mass was possible because the Progress was designed to be unmanned and disposable. This means that there is no need for bulky life support systems and heat shields. The spacecraft also has no ability to split into separate modules. After undocking, the spacecraft performs a retrofiring and burns up in the atmosphere.
There were many small variations between the different flights, but the major upgrades are reflected in the change of name.
Progress (1978-1990) 
There were 42 spacecraft built using the initial Progress design, the last one being launched in May 1990.
The bureau in charge of designing the freighter was TsKBEM (now RKK Energia). They began work on the design in mid-1973, assigning Progress the GRAU index 11F615A15. The design was complete by February 1974, and the first production model was ready for launch in November 1977. Progress 1 launched on 20 January 1978 aboard the same rocket used to launch the Soyuz. It still featured the same launch shroud as the Soyuz, though this was purely for aerodynamic purposes as the launch escape system had been deactivated.
This first version of Progress had a mass of 7,020 kg and carried 2,300 kg of cargo, or 30% of its launch weight. It had the same diameter as the Soyuz at 2.2 metres, but was 8 metres in length—slightly longer. The autonomous flight time was 3 days, the same time as that of the Soyuz ferry. It could spend one month docked. Progress always docked to the aft port of the station it was resupplying.
- Launch weight 7,020-7,249 kg
- Weight of cargo (Progress 1-24) ~2,300 kg
- Weight of cargo (Progress 24-42) ~2,500 kg
- Length 7.94 m
- Diameter of cargo modules 2.2 m
- Maximum diameter 2.72 m
- Volume of cargo compartment 6.6 m³
Progress-M 11F615A55 (1989-2009) 
The upgraded Progress M (GRAU: 11F615A55, manufacturer's designation: 7K-TGM) was first launched in August 1989. The first 43 flights all went to Mir; following Mir's re-entry, Progress was used as the resupply vehicle for the International Space Station. As of June 2009[update], there have been 33 Progress flights to the ISS and more are scheduled.
The Progress M is essentially the same spacecraft as the Progress, but it features improvements based on the Soyuz T and TM designs. It can spend up to 30 days in autonomous flight and is able to carry 100 kg more. Also, unlike the old Progress crafts, it can return items to Earth. This is accomplished by using the Raduga capsule, which can carry up to 150 kg of cargo. It is 1.5 m long and 60 cm in diameter and has a "dry weight" of 350 kg. Progress M can also dock to the forward port of the station and still transfer fuel. It uses the same rendezvous system as the Soyuz, and it features solar panels for the first time.
- Launch weight 7,130 kg
- Cargo weight 2,600 kg
- Dry cargo weight 1,500 kg
- Liquid cargo weight 1,540 kg
- Length 7.23 m
- Diameter of cargo modules 2.2 m
- Maximum diameter 2.72 m
- Dry cargo compartment volume 7.6 m³
- Solar array span 10.6 m
Progress-М 11F615A60 (2008-present) 
A new modification of the Progress spacecraft, with new TsVM-101 digital flight computer and MBITS digital telemetry system, was first launched on 26 November 2008, at 12:38 UTC from the Kazakhstan's Baikonur Cosmodrome spaceport aboard a Russian Soyuz rocket. The first spacecraft of this series was Progress M-01M.
Progress M1 (2000-2004) 
Progress M1 is another variant, capable of carrying more propellant (but less total cargo) to the space stations. There have been 11 of these flights.
- Mass: 7,150 kg
- Capacity cargo: 2,230 kg
- Capacity dry cargo: 1,800 kg
- Capacity propellant: 1,950 kg
Progress M2 
Progress M2 was a planned variant, which was a proposed design for the proposed Mir-2 space station, but was dropped due to financial issues. The M2 variant would have a larger service module for larger cargo or space station modules and would have been launched on a Zenit launch vehicle.
Progress MS 
Progress MS is a planned variant which should fly in 2014.
Current status 
Progress spacecraft are currently used to resupply the International Space Station (ISS). Between 1 February 2003 and 26 July 2005, they were the only spacecraft available to transport large quantities of supplies to the station, as the Space Shuttle fleet was grounded after the breakup of Columbia at the end of STS-107. For ISS missions, the Progress M1 variant is used, which moves the water tanks from the propellant and refueling module to the pressurized section, and as a result is able to carry more propellant. Progress M-67, the final flight of a Progress-M spacecraft, was launched 24 July 2009 on a Soyuz-U.
The European Space Agency (ESA) operates its own type of supply freighter, the Automated Transfer Vehicle (ATV). The first of these, named Jules Verne, was launched at 04:03 GMT on 9 March 2008. ATVs can carry up to 8 tonnes of cargo into space, roughly three times as much as the Progress, and will be launched every 12–18 months by Ariane 5 rockets.
NASA's Orion spacecraft, which was to replace the Space Shuttle after 2015, was initially designed to have an unmanned variant similar to Progress, however this capability has since[when?] been removed. SpaceX commercial (private owned) Dragon spacecraft is the other American space ship currently supplying ISS. It is expected that Orbital Sciences (another private company) soon will also handle American logistics to the International Space Station.
RKK Energia has proposed the Parom (ferry) spacecraft as a replacement for Progress. This new spacecraft would retrieve either the proposed Kliper spacecraft or any cargo container with a Russian airlock and weighing up to 15 short tons (14 t) back to the ISS.
See also 
- List of Progress flights
- List of unmanned spaceflights to the ISS
- Comparison of orbital spacecraft
- Unmanned resupply spacecraft - descriptions of other similar vehicles:
- Automated Transfer Vehicle - a similar cargo vehicle developed by the European Space Agency
- Cygnus spacecraft - a similar cargo vehicle developed by Orbital Sciences Corporation
- Dragon Cargo spacecraft - a similar cargo vehicle, also capable of returning 3000 kg of cargo to Earth,NASASpaceflight  developed by Space Exploration Technologies
- H-II Transfer Vehicle - a similar cargo vehicle developed by Japan Aerospace Exploration Agency
- Orbital Technologies Commercial Space Station
- "Progress". Encyclopedia Astronautica. Retrieved 29 March 2013.
- "Return to selections: 1". Spacecraft Names. Retrieved 29 March 2013.
- "Russian Designations". Encyclopedia Astronautica. Retrieved 29 March 2013.
- "Progress-M 1M - 25M (11F615A60, 7KTGM)". Gunter's Space Page. Retrieved 29 March 2013.
- "Soyuz-TMA 01M - 16M (7K-STMA, 11F747)". Gunter's Space Page. Retrieved 29 March 2013.
- "Progress M2". Encyclopedia Astronautica. Retrieved 29 March 2013.
- Chris Bergin (July 4, 2009). "Constellation battle numerous Top Risks – Orion loses unmanned capability". NASASpaceflight. Retrieved 29 March 2013.
- "Dragonlab datasheet, v.2.1". SpaceX. Retrieved 29 March 2013.
|Wikimedia Commons has media related to: Progress|
- NASA - Russian Progress Spacecraft - NASA page discussing the Progress spacecraft, updated May 2005.
- RussianSpaceWeb.com - Progress cargo ship - History, photos and details