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Russian heavy-lift orbital launch vehicle. In 1969 the Soviet Union began project Aelita, studying the best method to beat the Americans in landing a man on Mars. Chelomei's team reached the conclusion that a Mars expedition would best be launched by an immense vehicle would allow their MK-700 Mars spacecraft to be orbited in two launches. The proposed UR-700M launch vehicle had a gross lift-off mass of 16,000 metric tons and could deliver 750 metric tons to orbit. By 1972 the Nixon administration had cancelled NASA's plans for manned Mars missions. Perhaps not coincidentally, a Soviet expert commission the same year concluded that the Mars project - and the UR-700M booster - were beyond the technical and economical capabilities of the Soviet Union and should be shelved indefinitely.

Status: Design 1972. Payload: 750,000 kg (1,650,000 lb). Thrust: 200,000.00 kN (44,960,000 lbf). Gross mass: 16,000,000 kg (35,000,000 lb). Height: 175.00 m (574.00 ft). Diameter: 31.00 m (101.00 ft). Apogee: 200 km (120 mi).

In 1962 Vladimir Chelomei proposed a family of modular launch vehicles. The UR-700 was designed for direct manned flight to the surface of the moon. While approval to proceed with development of the UR-500 came in April 1962, no such go-ahead was received for the UR-700. Studies continued however, and report index number 4855CC by TsNIIMASH in 1966 showed that any development of improved versions of the N1 would be practically equivalent to design and qualification of a new rocket, while the UR-700 modular approach allowed a range of payloads without requalification. UR-700 derivatives could better support the DLB lunar base, Venus/Mars manned flybys and Mars landing expeditions. Development of the UR-700 was approved on 17 September 1967. However no go-ahead to proceed past the design phase was forthcoming in 1968.

By January 1969, Chelomei was proposing the UR-900 for the Mars expedition. Chertok asked Chelomei what would happen if, God forbid, such a booster exploded on the launch pad. Wouldn't the entire launch complex be rendered a dead zone for 18 to 20 years? Chelomei's reply was that it wouldn't explode, since Glushko's engines were reliable and didn't fail. Aside from that, these propellants had been used in hundreds of military rockets, deployed in silos, aboard ships and submarines, with no problem. Fear of these propellants was irrational. Related propellants were used by the Americans on the Apollo manned spacecraft.

Less than three months later, on 2 April 1969, the unimaginable happened. A Proton rocket, one tenth the size of the planned UR-900, was launched in an attempt to send an unmanned probe to Mars. The leadership of the Soviet Rocket Forces and most of the Chief Designers were present for the event. The Proton rocket lifted off, but one engine failed. The vehicle flew at an altitude of 50 m horizontally, finally exploding only a few dozen meters from the launch pad, spraying the whole complex with poisonous propellants that were quickly spread by the wind. Everyone took off in their autos to escape, but which direction to go? Finally it was decided that the launch point was the safest, but this proved to be even more dangerous - the second stage was still intact and liable to explode. The contamination was so bad that there was no way to clean up - the only possibility was just had to wait for rain to wash it away. This didn't happen until the Mars 1969 launch window was closed, so the first such probe was not put into space until 1971.

This accident seems to have made a powerful impression on the military, and plans for a new generation of space launchers drawn up in the early 1970's specified use of non-toxic liquid oxygen and kerosene propellants. This also forced Chelomei to specify these propellants in the redesignated UR-700M for the Mars expedition.

By the middle of 1969, in the post-Apollo moon landing euphoria, NASA was pressing for funding for a manned expedition to Mars. Ministry of Defense decree 232 of 30 June 1969 authorized preparation of Soviet draft projects for a manned Mars expedition. Code named Aelita, the TTZ specification for the expedition was prepared by TsNIIMASH and NIITI. The TTZ called for a launch vehicle with a low earth orbit payload of 200 to 250 metric tons to be available by 1976. This vehicle would be used to support a Soviet lunar base, heavy military and civilian space stations, and a Mars expedition spacecraft of 1,500 metric tons mass.

Analysis of the requirement by Chelomei indicated a larger launch vehicle than that required by the TTZ would be optimum. Opportunities for launches to Mars had limited launch windows at two year intervals. The combined probability of successfully launching, docking, and assembling a half dozen payloads in low earth orbit was relatively low. The optimum chance for mission success was to use no more than one or two dockings in earth orbit (NASA came to a similar conclusion in the early 1960's, leading to the Nova launch vehicle studies). Chelomei used a modular approach to the launch vehicle design in order to achieve payloads of 300 to 800 metric tons. By the advanced project stage the MK-700 Mars spacecraft assembly sequence had been reduced to two variants:

The first variant was considered preferable to avoid losses in net payload due to systems and propellants required for docking.

Unit p/ya A-1233 of TsKBM determined that it would be possible to reduce the mass of the Mars spacecraft to 900 to 1,000 metric tons. This would allow the Variant 2 booster to be used with only one docking.

The design evolved considerably over the next three years. The preliminary draft project utilized the following design principles for the UR-700M:

The final payload for the Mars expedition was determined to be 1200 to 1400 metric tons in a 250 km / 51.6 degree parking orbit. A thermal nuclear stage would be used for trans-Mars injection from the parking orbit. Two variants of the expedition were considered:

The UR-700M launch vehicle had a gross lift-off mass of 16,000 metric tons and could deliver 750 metric tons to a 250 km, 51.6 degree orbit. It consisted of three stages: Stage 1 and 2 used Lox/Kerosene propellants, and stage 3 Lox/LH2. As in the UR-700, all the engines of Stage 1 and Stage 2 operated at lift-off, but the engines of the second stage were fed from propellant tanks in the first stage. The vehicle consisted of five 9 m diameter first stage blocks with a dry mass of 750 metric tons, three second stage blocks (two of 9 m diameter flanking a 12.5 m diameter core block) with a dry mass of 500 metric tons, and a 12.5 m diameter, 200 metric ton empty mass third stage. Each of the outer blocks had 4 x 600 tf engines by KBEM (two 300 tf chambers per engine), while the12.5 m diameter core block had a total of 6 x 600 tf engines. The third stage had 6 x NK-35 engines of 200 tf each.

The UR-700M/LK-700 advanced project was reviewed by the expert commission in 1972. Their conclusions were:

Therefore the commission concluded the Mars project - and the UR-700M booster - should be shelved indefinitely.

LEO Payload: 750,000 kg (1,650,000 lb) to a 200 km orbit at 51.00 degrees.

Stage Data - UR-700M

Family: heavy-lift, orbital launch vehicle. Country: Russia. Engines: NK-35, RD-410, RLA-300, RLA-600. Spacecraft: MK-700. Stages: UR-700M-3, UR-700M-2, UR-700M-1. Agency: Chelomei bureau. Bibliography: 367, 443, 474.

1969 June 30 - . Launch Vehicle: UR-700M.
1969 July 30 - . Launch Vehicle: UR-700M.
1972 During the Year - . Launch Vehicle: UR-700M.

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