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A comment on Musk explains why SpaceX prefers clusters of small engines.

Re:Musk explains why SpaceX prefers clusters of small engines by avmich on Thursday February 08, 2018 @12:12PM (#16333670)
> The Russian Soyuz rocket has five engines, each of which has six thrust chambers.

RD-107 on the four side blocks has 6 chambers, RD-108 on the central block has 8 chambers.

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