The Texan air is obviously only 7% the density of normal air
It survived?!?! IT SURVIVED!!! And they even fired it at sea level without vacuum conditions (a giant tube)!!! @elonmusk how did it hold up at sea level without flow separation?! It looks like it has a big expansion ratio! 
https://twitter.com/SpaceX/status/1309317126130339845 …
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Generally it’s more like 120%, given humidity.
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How much time is full duration?
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iirc its less about the time, more about getting a stable fire while moving through all of the engine's modes and processes, rather than firing it for 2 seconds in 1 configuration and calling it 'done'
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Too much gobbledygook for my feeble mind Tim. *flow seperation* *expansion ratio*
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This pic sums it up pretty nicely. The bottom bit is flow separation and pretty bad for the engine.pic.twitter.com/JqJWlhxUcB
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RS-25n't
Kiitos. Käytämme tätä aikajanasi parantamiseen. KumoaKumoa
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Kind of makes you wonder if it is somehow stable at sea-level if it would be more efficient to just carry vacuum engines on Starship and take the Isp penalty vs lugging around 3 extra engines.
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I wonder if it had extra reinforcement or something for sea level testing. Based on rough calcs its expansion ratio is over 100:1!
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Doesn't look particularly overexpanded (no separation at the nozzle). Would be interested to understand why. Maybe the found a magic profile for the chamber wall to finesse the expansion?
Kiitos. Käytämme tätä aikajanasi parantamiseen. KumoaKumoa
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