Blok E

Blok E^[1]
Manufacturer	Yuzhnoye Design Bureau
Country of origin	Soviet Union
Used on	N-1
General characteristics
Gross mass	2,950 kg (6,500 lb)
Launch history
Status	Retired
Blok E
Powered by	11D410
Maximum thrust	20 kN (4,500 lbf)
Specific impulse	315 s (3.09 km/s)
Propellant	UDMH/N2O4

Blok E is the propulsion unit of Soviet lunar module LK, developed in 1960s by Yuzhnoye Design Bureau as a part of the manned lunar landing program^[3].

Blok E was designed to soft land the LK on the surface of the Moon after orbital velocity was cancelled by Block D. Later the same engine would fire for the second time for the liftoff and ascent from the Moon to rendezvous with the orbiting Soyuz 7K-LOK.^[4]^[5] Block E used RD-858^[6], which has one nozzle and is deeply throttleable (from 2050 kg to 858 kg of thrust),^[7] as the primary engine. The backup engine was RD-859^[8], which has two nozzles. Engines were equipped with clam-shell doors to prevent damaging it while staying on the surface of the Moon. There were four additional vernier engines placed between main and backup engine nozzles.

References

^ http://www.russianspaceweb.com/lk-block-e.html
^ http://www.astronautix.com/l/lk.html
^ http://www.russianspaceweb.com/lk-block-e.html
^ "LK spacecraft and Block E". Russianspaceweb.com. Archived from the original on 2013-12-30. Retrieved 2013-12-15.
^ "Liquid propellant propulsion systems, Yuzhnoe Design Bureau". yuzhnoe.com. Archived from the original on 2014-07-14. Retrieved 2014-07-10.
^ https://space.skyrocket.de/doc_sdat/lk-t2k.htm
^ "RD-858". Astronautix.com. Archived from the original on 2016-03-26. Retrieved 2016-03-18.
^ https://space.skyrocket.de/doc_sdat/lk-t2k.htm

[1] ttps://www.russianspaceweb.com/lk-block-e.html

[2] ttps://www.astronautix.com/l/lk.html

[3] ttps://www.russianspaceweb.com/lk-block-e.html

[4] "LK spacecraft and Block E". Russianspaceweb.com. Archived from the original on 2013-12-30. Retrieved 2013-12-15.

[5] "Liquid propellant propulsion systems, Yuzhnoe Design Bureau". yuzhnoe.com. Archived from the original on 2014-07-14. Retrieved 2014-07-10.

[6] ttps://space.skyrocket.de/doc_sdat/lk-t2k.htm

[7] "RD-858". Astronautix.com. Archived from the original on 2016-03-26. Retrieved 2016-03-18.

[8] ttps://space.skyrocket.de/doc_sdat/lk-t2k.htm

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v t e Upper stages
Active	AVUM Briz Castor 30 Centaur CTS / SMA DCSS DM-03 Fregat Star 27 / 37 / 48 Volga Yuanzheng
Planned	Advanced Cryogenic Evolved Stage Exploration Upper Stage KVTK
Retired	Agena Able Altair Astris Blok 2BL Blok D Burner Delta-D Delta-K Delta-P EPKM FG-02 Ikar Inertial Upper Stage KVD-1 Payload Assist Module Saturn IV Saturn IVB Transfer Orbit Stage Transtage

v t e Soviet crewed lunar programs
Launch vehicles and ascent/upper stages	N1 rocket Proton rocket Blok E Blok D
Spacecraft	LK-1 VA spacecraft LK-700 Zond (Soyuz 7K-L1) Zond-M (Soyuz 7K-L1S) Zond-LOK (Soyuz 7K-L1E) LOK (Soyuz 7K-L3) LK (spacecraft)
Other hardware	Lunokhod-LK Krechet-94
Soyuz docking tests	Soyuz 1, Soyuz 2A Soyuz 2, Soyuz 3 Soyuz 4, Soyuz 5 Soyuz 6, Soyuz 7, Soyuz 8 Soyuz Kontakt 1, 2
Zond (7K-L1/L1S) lunar flyby missions	Kosmos 146 Kosmos 154† Zond 1967A† Zond 1967B† Zond 4 Zond 1968A† Zond 1968B† Zond 5 Zond 6 Zond 1969A† Zond-M 1 (L1S-1) Zond-M 2 (L1S-2)† Zond 7 Zond 8 Zond 9 Zond 10 Kosmos 382
LOK (7K-LOK/L1E) test missions	Zond-LOK 1† LOK 1† LOK 2
LK Lander (T2K) test missions	Kosmos 379 Kosmos 398 Kosmos 434 LK-1
The † sign designates failed missions. Italics designates cancelled missions.

See also

References