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A comment on SpaceX installed 29 Raptor engines on a Super Heavy rocket last night. Parent comment

Re:SpaceX installed 29 Raptor engines on a Super Heavy rocke... by Tuna-Fish on Tuesday August 03, 2021 @03:25AM (#28046545)
... surprisingly, this is not much of an issue. The key property for keeping a rocket engine from melting is not high melting point, but high thermal conductivity. Because of this, all the parts that touch the hot flame are made from a copper alloy, with a melting point not far from that of pure gold.

In the chamber, the hot gases are >3500K, and touching the inner walls with a melting point at ~1400K, yet the walls don't melt, because they are cooled with more power than they are heated.

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Re:SpaceX installed 29 Raptor engines on a Super Heavy rocke... by jhgb on Wednesday August 04, 2021 @06:28PM (#28067274)
> they are cooled with more power than they are heated

I'd argue that they're being cooled with equal power, otherwise they could freeze infinitely which is physically impossible.

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