# Tag Info

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 ...

0

The surprisingly low answer is: 2. But it is very unpractical and not enough redundant. The reasoning is very simple. The angular velocity vector has 3 degrees of freedom, but its length (the absolute value of the angular velocity) does not count. Bigger deviation from the expected can be compensated by a longer RCS fire. 1 would be surely not enough, it ...

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