Buran at the 1989 Paris Air Show
|Status||Destroyed in a 2002 hangar collapse|
|First flight||15 November 1988|
|Last flight||15 November 1988|
|No. of missions||1|
|Time spent in space||3 hours, 25 minutes, 22 seconds|
|No. of orbits||2|
Buran (Russian: Бура́н, IPA: [bʊˈran], meaning "Snowstorm" or "Blizzard"; GRAU index serial number: "11F35 K1") was the first spaceplane to be produced as part of the Soviet/Russian Buran programme. It is, depending on the source, also known as "OK-1K1", "Orbiter K1", "OK 1.01" or "Shuttle 1.01". Besides describing the first operational Soviet/Russian shuttle orbiter, "Buran" was also the designation for the entire Soviet/Russian spaceplane project and its orbiters, which were known as "Buran-class spaceplanes".
OK-1K1 completed one uncrewed spaceflight in 1988, and was destroyed in 2002 when the hangar it was stored in collapsed. The Buran-class orbiters used the expendable Energia rocket, a class of super heavy-lift launch vehicle.
The construction of the Buran spaceplanes began in 1980, and by 1984 the first full-scale orbiter was rolled-out. Construction of a second orbiter (OK-1K2, informally known as Ptichka (meaning little bird)) started in 1988. The Buran programme ended in 1993.
The only orbital launch of a Buran-class orbiter occurred at 03:00:02 UTC on 15 November 1988 from Baikonur Cosmodrome launch pad 110/37. Buran was lifted into space, on an uncrewed mission, by the specially designed Energia rocket. The automated launch sequence performed as specified, and the Energia rocket lifted the vehicle into a temporary orbit before the orbiter separated as programmed. After boosting itself to a higher orbit and completing two orbits around the Earth, the ODU (Russian: объединённая двигательная установка, сombined propulsion system) engines fired automatically to begin the descent into the atmosphere, return to the launch site, and horizontal landing on a runway.
After making an automated approach to Site 251 (known as Yubileyniy Airfield), Buran touched down under its own control at 06:24:42 UTC and came to a stop at 06:25:24, 206 minutes after launch. Despite a lateral wind speed of 61.2 kilometres per hour (38.0 mph), Buran landed only 3 metres (9.8 ft) laterally and 10 metres (33 ft) longitudinally from the target mark. It was the first spaceplane to perform an uncrewed flight, including landing in fully automatic mode. It was later found that Buran had lost only eight of its 38,000 thermal tiles over the course of its flight.
In 1989, it was projected that OK-1K1 would have an uncrewed second flight by 1993, with a duration of 15–20 days. Although the Buran programme was never officially cancelled, the dissolution of the Soviet Union led to funding drying up and this never took place.
- Mass breakdown
- Total mass of structure and landing systems: 42,000 kg (93,000 lb)
- Mass of functional systems and propulsion: 33,000 kg (73,000 lb)
- Maximum payload: 30,000 kg (66,000 lb)
- Maximum liftoff weight: 105,000 kg (231,000 lb)
- Length: 36.37 m (119.3 ft)
- Wingspan: 23.92 m (78.5 ft)
- Height on gear: 16.35 m (53.6 ft)
- Payload bay length: 18.55 m (60.9 ft)
- Payload bay diameter: 4.65 m (15.3 ft)
- Wing glove sweep: 78 degrees
- Wing sweep: 45 degrees
- Total orbital maneuvering engine thrust: 17,600 kgf (173,000 N; 39,000 lbf)
- Orbital maneuvering engine specific impulse: 362 seconds (3.55 km/s)
- Total maneuvering impulse: 5 kgf-sec (11 lbf-sec)
- Total RCS thrust: 14,866 kgf (145,790 N; 32,770 lbf)
- Average RCS specific impulse: 275–295 seconds (2.70–2.89 km/s)
- Normal maximum propellant load: 14,500 kg (32,000 lb)
Unlike the US Space Shuttle, which was propelled by a combination of solid boosters and the orbiter's own liquid-propellant engines fueled from a large tank, the Soviet/Russian shuttle system used thrust from each booster's four RD-170 liquid oxygen/kerosene engines, developed by Valentin Glushko, and another four RD-0120 liquid oxygen/liquid hydrogen engines attached to the central block.
On 12 May 2002, during a severe storm at the Baikonur Cosmodrome, the MIK 112 hangar housing OK-1K1 collapsed as a result of poor maintenance. The collapse killed several workers and destroyed the craft as well as the Energia carrier.
- OK-GLI – Buran Analog BST-02 test vehicle
- Mikoyan-Gurevich MiG-105 – Soviet orbital spaceplane
- Space Shuttle program (United States)
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