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Soyuz 7K-L1
Part of Soyuz

L1 Overhead

L1 Overhead
Soyuz 7K-L1 circumlunar spacecraft. This seems to correspond to the unmanned 'as flown' version for direct flights to the moon.

Russian manned lunar flyby spacecraft. The Soyuz 7K-L1, a modification of the Soyuz 7K-OK, was designed for manned circumlunar missions. Lunar flyby and return satellite, Russia. Launched 1967 - 1970.

AKA: 11F91;7K-L1;Zond 4-8. Status: Operational 1967. First Launch: 1967-03-10. Last Launch: 1970-10-20. Number: 12 . Thrust: 4.17 kN (937 lbf). Gross mass: 5,680 kg (12,520 lb). Unfuelled mass: 4,980 kg (10,970 lb). Specific impulse: 276 s. Height: 4.88 m (16.01 ft).

With a complex genesis, the spacecraft was flown as a replacement for Chelomei's LK-1. The 7K-L1 never actually demonstrated that it could safely take a cosmonaut around the moon and return him to earth until August 1969, a month after the successful American Apollo 11 landing on the moon. By then any thoughts of a manned flight had been abandoned as too little and too late. The Soviet disinformation organs began disseminating the myth that the USSR had never been in the moon race at all. The project was cancelled in 1970.

In comparison with the 7K-OK from which it was derived, the forward living module was deleted, as was the reserve parachute (in order to add an exit hatch in the side of the re-entry capsule). Special on-board systems were added for interplanetary navigation. The SAS launch escape system, more powerful than that for the earth orbital version of Soyuz, could pull the spacecraft away from a failing Proton booster up to the point of second stage ignition. A Spacecraft Support Cone (OK) was mounted on the forward hatch of the Soyuz capsule to provide a point of attachment for the SAS. This was jettisoned before Block D ignition for translunar injection.

Korolev had originally designed the Soyuz A-B-V (7K-9K-11K) spacecraft for the circumlunar mission, using earth orbit rendezvous to assemble the spacecraft and its translunar injection stage. This began development in 1964, but instead Chelomei's LK-1 single-manned spacecraft was selected on 3 August 1964 for that mission. The LK-1 was to be placed on a translunar trajectory in a single launch of Chelomei's UR-500K rocket.

On 14 October 1964 Khrushchev was ousted from power, and Chelomei lost his patron. At the same time, at the end of 1964, Korolev reanimated his Soyuz project - not overtly the circumlunar version, but the 7K-OK orbital spacecraft. Korolev's stated purpose was for two of these spacecraft to demonstrate rendezvous and docking in earth orbit. But this was not exactly what he really intended.

On 25 October 1965, less than three months before his death, Korolev regained the project for manned circumlunar flight. He would use a derivative of the 7K-OK, the 7K-L1, in place of Chelomei's LK-1. This would still be launched by Chelomei's large UR-500K rocket, but with a Block D translunar injection stage taken from Korolev's N1. Originally Korolev considered that the 7K-L1, for either safety or mass reasons, could not be boosted directly by the UR-500K toward the moon. Therefore he envisioned launch of the unmanned 7K-L1 into low earth orbit, followed by launch and docking of a 7K-OK with the 7K-L1. The crew would then transfer to the L1, which would then be boosted toward the moon.

After the death of Korolev OKB-1 was taken over by Vasiliy Pavlovich Mishin. It was decided that the Soyuz 7K-L1 could be lightened enough to be launched toward the moon safely by the UR-500K/Block D combination without an additional ferry flight of the 7K-LOK. This became the final baseline for the mission.

The L-1 was officially developed according to the decrees of 3 August 1964 and 25 October 1965. It consisted of the 11S824 Block D rocket stage and the 11F91 7K-L1 spacecraft, and the Block L-1 SAS (launch escape system). The L1 had a total mass of 27.5 metric tons at ignition of the Block D stage, which occurred at suborbital velocity. The Block D burned for 160 seconds the first time, placing the complex into an earth parking orbit. At translunar injection, total mass was 18.2 metric tons.

The Block D was derived from the N1-L3 moon landing braking stage. The spherical liquid oxygen oxidizer tank was of titanium and was enclosed by thermal insulation blankets. The toroidal fuel tank was also of titanium. The 11D58 engine had a thrust of 8.5 metric tons and a specific impulse of 349 seconds. It was derived from the 8D726 rocket engine of the 8K713 GR-1 Global Rocket, which itself was derive from the S1.5400 Block L of the 8K78 Monlniya launch vehicle.

The 7K-L1 was a modified Soyuz 7K-OK. The forward living module was deleted, as was the reserve parachute (in order to add an exit hatch in the side of the re-entry capsule). Special on-board systems were added for interplanetary navigation. The SAS launch escape system, more powerful than that for the earth orbital version of Soyuz, could pull the spacecraft away from the failing booster up to the point of second stage ignition. A Spacecraft Support Cone (OK) was mounted on the forward hatch of the Soyuz capsule to provide a point of attachment for the SAS. This was jettisoned before Block D ignition.

In February 1967 the government approved an integrated L1/L3 project plans indicating a first manned L1 circumlunar mission as early as June 1967. First tests would use 7K-L1P prototypes. These had only a boilerplate descent module and were not capable of re-entry and recovery. These would be followed by unmanned circumlunar test flights. These had descent modules equipped with photography equipment, radiation measuring instruments, and biological specimens for return to earth. Only after the design was proven in two successive unmanned missions would a crew be risked.

On March 10 1967, Cosmos 146 was launched in the first flight test of hardware for the project. A Proton launched the Soyuz 7K-L1P into the planned highly elliptical earth orbit. The Block D stage functioned correctly in its first test, putting the spacecraft into a translunar trajectory. The spacecraft was not aimed at the moon and no recovery was planned or possible. This successful launch created a false confidence just before the string of failures that would follow. On April 8 Cosmos 154 reached earth orbit but the Block D translunar injection stage failed to fire (ullage rockets, which had to fire to settle propellants in tanks before main engine fired, were jettisoned prematurely). The spacecraft burned up two days later when its orbit decayed.

As noted in the chronology that follows, the 7K-L1 never actually demonstrated that it could safely take a cosmonaut around the moon and return him to earth until August 1969, a month after the successful American Apollo 11 landing on the moon. By then any thoughts of a manned flight had been abandoned as too little and too late. The Soviet disinformation organs began disseminating the myth that the USSR had never been in the moon race at all. The project was cancelled in 1970.

Crew Size: 2. Orbital Storage: 7.00 days. Habitable Volume: 4.00 m3. Spacecraft delta v: 200 m/s (650 ft/sec). Electric System: 0.80 average kW.


More at: Soyuz 7K-L1.

Family: Lunar Flyby, Manned Circumlunar, Moon. Country: Russia. Engines: KTDU-53. Spacecraft: Soyuz 7K-L1 SA, Soyuz 7K-L1 SOK, Soyuz 7K-L1 PAO. Launch Vehicles: Proton, Proton-K, Proton-K/D, N1, N1 1969. Propellants: Nitric acid/UDMH. Projects: Lunar L1. Launch Sites: Baikonur, Baikonur LC81/23, Baikonur LC81/24, Baikonur LC110R. Agency: Korolev bureau, MOM. Bibliography: 121, 123, 125, 164, 165, 168, 2, 21, 23, 273, 274, 283, 296, 32, 367, 376, 4236, 474, 51, 6, 67, 70, 72, 89, 96, 6897, 13119, 13120.
Photo Gallery

L1 ComparisonL1 Comparison
Official drawings of the unmanned early L1 version (without forward SOK, loaded with instruments in capsule, old-fashioned rumpled Soyuz-type solar panels) and the later L1 version (SOK consists of SAS electronics on light lattice structure, rigid solar panels first seen in Soyuz ASTP).


Panel Soyuz 7K-L1Panel Soyuz 7K-L1
Control panel of the circumlunar version of Soyuz, based on photographs inadvertently released in the 1970's.
Credit: © Mark Wade


L1 instrument moduleL1 instrument module
The service module of the Soyuz 7K-L1 / Zond manned circumlunar spacecraft.
Credit: © Mark Wade


Zond motorZond motor
The Soyuz 7K-L1 rocket engine as developed for the circumlunar flights. This deleted the backup engine (presumably the reaction control system thrusters were powerful enough to accomplish mid-course corrections if the main engine failed).
Credit: © Mark Wade


L1 EngineL1 Engine
The lunar LOK engine installation. The single main engine is flanked by four canted nozzles for yaw/pitch control.
Credit: © Mark Wade


L1 instrument moduleL1 instrument module
Close-up of the service module of the Soyuz 7K-L1 / Zond manned circumlunar spacecraft.
Credit: © Mark Wade


L-1L-1
Drawing of the L1 spacecraft at the Kaluga Museum. Note the hatch clearly shown in the side of the re-entry capsule and the very large inverted cone at the top - much larger than shown in other drawings. Is this a 'posadka' L1?
Credit: © Mark Wade


Proton w/ LKProton w/ LK
Proton 8K82K Block D launch vehicle with Soyuz 7K-L1 manned circumlunar spacecraft.


L1 lunar craftL1 lunar craft
L1 lunar craft in assembly. Note the very extensive equipment boxes above the capsule, and the clear hatch providing entry into the side of the capsule. Is this a 'podsadka' L1?
Credit: RKK Energia


L1 PodsadkaL1 Podsadka
Concept of L1 Podsadka, using Soyuz Igla docking system for crew transfer to hatch in side of L1 capsule.
Credit: © Mark Wade


L1 Cross-sectionL1 Cross-section
Cross section of L1 spacecraft with Block D stage - after a portrayal in an official RKK History.
Credit: © Mark Wade


L1 ComparisonL1 Comparison
Comparison of L1 drawings, the first displayed in the Kaluga Museum, the second from the RKK Energia history. Differences are notable in the forward SOK, solar panels, external sensors on the PAO.
Credit: © Mark Wade


L! PodsadkaL! Podsadka
Concept of L1 Podsadka, after the concept of Vick for a curved inflatable airlock and free-space crew transfer.
Credit: © Mark Wade


Soyuz 7K-L1Soyuz 7K-L1
L1 manned circumlunar spacecraft, consisting of 11S824 Block D translunar injection stage and Soyuz 7K-L1 spacecraft.
Credit: © Mark Wade


ZondZond
Credit: Manufacturer Image


Cosmos 154Cosmos 154
Credit: Manufacturer Image


Zond-PPZond-PP
Credit: Manufacturer Image


ZondZond
Credit: © Mark Wade


Soyuz 7K-L1Soyuz 7K-L1
Credit: © Mark Wade


Zond rounding MoonZond rounding Moon
Credit: © Mark Wade



1962 November 1 - . Launch Vehicle: N1.
1965 August 20 - .
1965 September 1 - . LV Family: N1. Launch Vehicle: N1 1964.
1965 September 6 - . Launch Vehicle: N1.
1965 September 15 - . LV Family: , Proton, .
1965 September 16 - .
1965 October 25 - . Launch Vehicle: Proton.
1965 November 13 - . Launch Vehicle: Proton.
1965 November 24 - .
1965 December 31 - . LV Family: N1. Launch Vehicle: N1 1964.
1966 January 24 - .
1966 February 15 - .
1966 March 6 - .
1966 March 18 - .
1966 March 23 - .
1966 April 1 - .
1966 April 4 - .
1966 April 10 - . LV Family: Proton. Launch Vehicle: Proton-K.
1966 April 20 - .
1966 April 27 - .
1966 April 27 - .
1966 April 27 - . Launch Vehicle: Proton.
1966 May 3 - .
1966 May 19 - .
1966 May 20 - .
1966 May 31 - .
1966 July 22 - . LV Family: N1.
1966 July 27 - .
1966 August 11 - .
September 1966 - .
1966 September 2 - . LV Family: Proton. Launch Vehicle: Proton-K.
1966 September 2 - .
1966 September 7 - .
1966 October 4 - . LV Family: Proton. Launch Vehicle: Proton-K/D.
1966 October 5 - .
1966 October 10 - .
1966 November 1 - .
1966 November 19 - .
1966 November 21 - .
1966 November 21 - . LV Family: Proton. Launch Vehicle: Proton-K/D.
1966 December 2 - .
1966 December 2 - .
1966 December 6 - .
1966 December 7 - .
1966 December 10 - .
1966 December 24 - . LV Family: Proton. Launch Vehicle: Proton-K.
1966 December 31 - .
1967 January - . LV Family: Proton. Launch Vehicle: Proton-K.
1967 January 5 - .
1967 January 17 - .
1967 February 4 - . LV Family: Proton. Launch Vehicle: Proton-K/D.
1967 February 4 - . Launch Vehicle: N1.
1967 March 10 - . 11:30 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D.
1967 March 14 - .
1967 March 22 - .
1967 March 23 - .
1967 April 8 - . 09:00 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D. FAILURE: Block D ullage rocket failure; no restart.. Failed Stage: U.
1967 April 29 - .
1967 May 5 - . LV Family: N1, Proton, N11.
1967 May 6 - .
1967 May 15 - .
1967 May 20 - .
1967 May 22 - .
1967 May 26 - .
1967 May 29 - .
1967 June 16 - .
1967 July 16 - .
1967 July 24 - .
1967 July 29 - .
1967 August 2 - .
1967 August 8 - .
1967 September 19 - .
1967 September 26 - .
1967 September 27 - . 22:11 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D. FAILURE: First stage -1 RD-253 failed, resulting at T+67 sec in deviation from flight path.. Failed Stage: 1.
1967 October 6 - .
1967 October 7 - . LV Family: Proton. Launch Vehicle: Proton-K.
1967 October 16 - .
1967 October 17 - .
1967 November 16 - .
1967 November 22 - . 19:07 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/24. LV Family: Proton. Launch Vehicle: Proton-K/D. FAILURE: Second stage - 1 x RD-0210 failure, shutoff of stage 4 seconds after ignition. Launcher crashed downrange.. Failed Stage: 2.
1968 January 17 - .
1968 January 23 - .
1968 January 26 - .
1968 January 30 - .
1968 February 7 - . LV Family: , Proton, .
1968 February 12 - .
1968 February 21 - . LV Family: Proton. Launch Vehicle: Proton-K/D.
1968 February 29 - . LV Family: Proton. Launch Vehicle: Proton-K/D.
1968 March 2 - . 18:29 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D.
1968 March 3 - .
1968 March 5 - .
1968 March 6 - .
1968 March 7 - .
1968 March 7 - .
1968 March 12 - .
1968 March 25 - .
1968 March 26 - .
1968 April 19 - .
1968 April 20 - .
1968 April 21 - .
1968 April 22 - .
1968 April 22 - . 23:01 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/24. LV Family: Proton. Launch Vehicle: Proton-K/D. FAILURE: Second stage shut-off prematurely due to short-circuit in Zond control system.. Failed Stage: 2.
1968 April 23 - .
1968 May 21 - .
1968 June 3 - .
1968 June 26 - .
1968 June 26 - .
July 1968 - . LV Family: Proton. Launch Vehicle: Proton-K.
1968 July 15 - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. Launch Pad: LC81/pad?. LV Family: Proton. Launch Vehicle: Proton-K/D.
1968 July 21 - . Launch Site: Baikonur. Launch Complex: Baikonur. LV Family: Proton. Launch Vehicle: Proton-K.
1968 September 12 - .
1968 September 13 - .
1968 September 14 - . 21:42 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D.
1968 September 16 - .
1968 September 17 - .
1968 September 19 - . Launch Vehicle: N1.
1968 September 20 - .
1968 September 21 - .
1968 September 22 - .
1968 September 23 - .
1968 September 28 - .
1968 October 1 - .
1968 October 3 - .
1968 October 4 - .
1968 November 9 - .
1968 November 10 - .
1968 November 10 - . 19:11 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D.
1968 November 11 - .
1968 November 13 - .
1968 November 14 - .
1968 November 15 - .
1968 November 15 - . Launch Site: Baikonur. Launch Complex: Baikonur LC110R. Launch Vehicle: N1.
1968 November 16 - .
1968 November 17 - .
1968 November 18 - .
1968 November 20 - .
1968 November 20 - .
1968 November 26 - .
1968 November 29 - .
1968 December 12 - . Launch Vehicle: Spiral 50-50.
1968 December 16 - .
1968 December 25 - . Launch Vehicle: N1.
1968 December 26 - .
1968 December 27 - .
1968 December 30 - .
1969 January 8 - .
1969 January 20 - . 04:14 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D. FAILURE: Second stage - One RD-0210 engine fails at T+510 sec, resulting in flight path deviation, automatic shutoff of launch vehicle.. Failed Stage: 2.
1969 January 25 - . LV Family: N1, Proton.
1969 January 29 - .
1969 January 31 - .
1969 March - .
1969 March 20 - . Launch Vehicle: N1.
1969 May - .
1969 May 10 - .
1969 June 9 - .
1969 June 10 - . Launch Vehicle: N1.
1969 July - .
1969 August 7 - . 23:48 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D.
1969 September 1 - .
1969 September 18 - .
1969 September 19 - .
1969 September 20 - .
1969 December 1 - .
1970 October 20 - . 19:55 GMT - . Launch Site: Baikonur. Launch Complex: Baikonur LC81/23. LV Family: Proton. Launch Vehicle: Proton-K/D.
1970 October 28 - .
1970 October 28 - .
1970 October 31 - . LV Family: Proton. Launch Vehicle: Proton-K.

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