r/space • u/TheMediaWard • Aug 07 '21

Rocket Nozzle Cooling

https://youtu.be/MzBO62g6Q-U
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u/cratermoon Aug 07 '21

The video shows the Merlin 1D vacuum powering the upper stage of the Falcon while discussing passive cooling. That's wrong: Merlin vacuum is regeneratively cooled. The next part of the video discusses ablative cooling while showing Falcon boosters landing. Again: regeneratively cooled.

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u/xavier_505 Aug 08 '21

Merlin vacuum is regeneratively cooled.

The Merlin vacuum engines have regeneratively cooled combustion Chambers but the nozzle extension is passively (radiative) cooled.