N1 Block B is the second stage of the N1-LK-LOK. Created and designed with the scope of competing with the Saturn V, the N1 was to launch its first crewed mission somewhere in 1975. The N1-L3 program was eventually cancelled due to the failures of the first 4 launches. The shape of the stage is due to the placement of its fuel tanks and engines. 

Trivia

  • This was part of the Soviet planned "Moon rocket", which was never successfully used.
  • It may be used as station engine.
  • Its engines will run out of fuel at 40% high in the atmosphere when alone.

    Example

An N1-LK-LOK super heavy-lift launch vehicle positioned horizontally.

A model of a customised N1 in orbit.

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