|Soyuz 11A511L - |
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11A511 with reinforced second stage, large fairing for earth orbit test of LK lunar lander.
Launches: 3. Failures: 0. Success Rate: 100.00% pct. First Launch Date: 24 November 1970. Last Launch Date: 12 August 1971. LEO Payload: 5,500 kg. to: 200 km Orbit. at: 51.6 degrees.
LK moon lander test using the T2K version. First use of the Soyuz 11A511L booster modified especially for this purpose. The spacecraft made a series of engine burns, simulating the lunar landing profile. After 3.5 days in orbit, the first burn was made in imitation of a descent to the lunar surface after separation of the Block D lunar crasher stage. The orbit changed from 192 km X 233 km to 196 km X 1206 km orbit; delta V: 263 m/s. After 4 days in orbit, a large manoeuvre was made simulating the ascent from the lunar surface. The orbit was changed from 188 km X 1198 km to 177 km X 14,041 km; delta V: 1518 m/s. These main manoeuvres were followed by a series of small adjustments simulating rendezvous and docking with the LOK. The LK tested out without major problems and decayed from orbit on September 21, 1983.
Second space test of the LK moon lander test using the T2K version. Followed the same programme as Cosmos 379.
189km X 252km orbit to 186km X 1189km orbit. Delta V: 251 m/s
186km X 1189km orbit to 200km X 10905km orbit. Delta V: 1320 m/s
Total Delta V: 2832 m/s.
Officially: Investigation of the upper atmosphere and outer space.
Final LK moon lander test using the T2K version.
188km X 267km orbit to 190km X 1261km orbit. Delta V: 266 m/s
188km X 1262km orbit to 180km X 11384km orbit. Delta V: 1333 m/s
Total Delta V: 1599 m/s. Ten years later the spacecraft was due to re-enter over Australia soon after the Skylab scare. The Soviet Union told the people of Australia not to worry, it was only an experimental lunar cabin - the first inadvertent admission that their manned lunar project even existed!