Half a croissant, on a plate, with a sign in front of it saying '50c'
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Squeeze them low

Something something hot gas something Uranus
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A rocket's engine bell has much to do with its efficiency. At high air pressure a small bell is needed to push the gas straight back. At lower pressures you need a large one.

The idea is an attachment to the engine bell. This metal ring would shrink the lower portion of the bell, constraining the exhaust. At an appropriate altitude it would ablate, melt, blow up, or otherwise detach leaving a larger engine bell appropriate for the lower pressure.
Voice, Jul 14 2022

Dual-Bell Nozzle Design https://link.spring...78-3-030-53847-7_25
[a1, Jul 14 2022]

Altitude compensating nozzle https://en.wikipedi...compensating_nozzle
[a1, Jul 14 2022]

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