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. 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. Blok E used (or 11D411), which has one nozzle and is deeply throttleable (from 2050 kg to 858 kg of thrust), as the primary engine. The backup engine was (or 11D412), which has two nozzles.
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