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What are the advantages of using air instead of liquid? Is it just the breathablity aspect?

I posted a few comments in the past on my guess. A liquid filled loop with a (super)hydrophobic inner surface. Energy stored as kinetic, solar accelerated.

I have been looking, and haven't been able to find much info on reduced energy loss by using hydrophobic surfaces. It's a new enough tech that all the good info is behind academic paywalls.

Would pressure differences throughout the tube caused by differences in altitude be something to worry about? I'm not sure how, if at all, that would effect the hydrodynamics.

Also, I would be concerned that with that much fluid moving through it that fast, a possible failure mode could be "temporarily turns into a horizontal launch loop". (which would be awesome ;)

* Failure would look Awesome

Always a winning bullet point.

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