To install click the Add extension button. That's it.

The source code for the WIKI 2 extension is being checked by specialists of the Mozilla Foundation, Google, and Apple. You could also do it yourself at any point in time.

Kelly Slayton
Congratulations on this excellent venture… what a great idea!
Alexander Grigorievskiy
I use WIKI 2 every day and almost forgot how the original Wikipedia looks like.
Live Statistics
English Articles
Improved in 24 Hours
Added in 24 Hours
What we do. Every page goes through several hundred of perfecting techniques; in live mode. Quite the same Wikipedia. Just better.

From Wikipedia, the free encyclopedia

Blok E[1]
Block E KB Yuzhnoe.png
ManufacturerYuzhnoye Design Bureau
Country of originSoviet Union
Used onLK
General characteristics
Gross mass2,950 kg (6,500 lb)
Launch history
Launch date
Blok E
Thrust20 kN (4,500 lbf)
Specific impulse315 s (3.09 km/s)

Blok E (or Block 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.[1]

Blok E was designed to soft land the LK on the surface of the Moon after orbital velocity was cancelled by Blok D. Later the same stage would fire for the second time for the liftoff and ascent from the Moon to rendezvous with the orbiting Soyuz 7K-LOK.[3][4] Blok E used RD-858 (or 11D411),[5] which has one nozzle and is deeply throttleable (from 2050 kg to 858 kg of thrust),[6] as the primary engine. The backup engine was RD-859 (or 11D412),[5] which has two nozzles.

Together, the two engines formed the propulsion system designated 11D410.[7] Both engines burned a mix of unsymmetrical dimethyl hydrazine and nitrogen tetroxide. The hypergolic propellant components guaranteed their easy storage during a lunar expedition lasting at least 11 or 12 days.

The 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.

See also

  • N-1 – original launch vehicle for which this stage was developed


  1. ^ a b "The many lives of the Soviet lunar landing engine".
  2. ^ "LK".
  3. ^ "LK spacecraft and Block E". Archived from the original on 2013-12-30. Retrieved 2013-12-15.
  4. ^ "Liquid propellant propulsion systems, Yuzhnoe Design Bureau". Archived from the original on 2014-07-14. Retrieved 2014-07-10.
  5. ^ a b "LK (L3, T2K)".
  6. ^ "RD-858". Archived from the original on 2016-03-26. Retrieved 2016-03-18.
  7. ^

This page was last edited on 22 October 2020, at 03:55
Basis of this page is in Wikipedia. Text is available under the CC BY-SA 3.0 Unported License. Non-text media are available under their specified licenses. Wikipedia® is a registered trademark of the Wikimedia Foundation, Inc. WIKI 2 is an independent company and has no affiliation with Wikimedia Foundation.