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11

The CM entered the atmosphere blunt-end first, which became the hottest part during re-entry (see picture below left). So you can't place RCS thrusters on that part of the CM, as they would melt; you can only place them on the sides of the cone, where it stays cooler. Thus, the CM had no aft-facing ($-X$) RCS thrusters. Note that the side of the CM toward ...


4

RD-107 seems to have been used in the R7 missile. It says in the article for the missile that 1st stage: 4x jettisonable four-chamber RD-107 booster engines each with 2x vernier rocket engines plus 1x four-chamber RD-108 core engine with 4x vernier rocket engines. So the RD 107 stage was used in quadruplets. So vernier engines existed on diametrically ...


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