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SpaceX Starship SN9 experimental test vehicle

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SN9 peeking out of the High Bay, ready to go.
Ep2OFNbXcAEi8WD.jpg

https://twitter.com/SpacePadreIsle/status/1341377506662821889
 
Lets discuss SN9 here. What will be flight parameters? more height? what additional tests & maneuvers are expected?

Approx date/timeframe? I am planning to see if I can drive down there, but then with all rocket launches we may need to stay there for multiple days to accommodate scrubs and delays. Just got lucky with Falcon Heavy launch. It launched right on the first attempt with just a few hours delays.
 
Tim Dodd:
How're you feeling about SN9? What exactly had to be addressed to keep the CH4 tank from losing pressure? Any hardware changes or just software? Header tanks are also back pressurized with GCH4 and GOX, right?

Elon:
SN9 will press CH4 header tank with helium. Long-term solution is under debate. Not clear what is lightest/simplest.

https://twitter.com/elonmusk/status/1344344855237992448
 
Tim Dodd:
How're you feeling about SN9? What exactly had to be addressed to keep the CH4 tank from losing pressure? Any hardware changes or just software? Header tanks are also back pressurized with GCH4 and GOX, right?

Elon:
SN9 will press CH4 header tank with helium. Long-term solution is under debate. Not clear what is lightest/simplest.

https://twitter.com/elonmusk/status/1344344855237992448

I'm pretty sure that helium is a temporary thing they are using for Starship testing. SpaceX and Elon wants to get the maneuvering and flip process down. Pressurization is something they know well and they can modify and perfect at a later time.
 
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