That's right, Tom. I was thinking of that on my way back from the airport just now. I logged into RAS to say what you said.

If we incorporated a little ballast water to the mix we can operate at lower pressure which would be good for a number of reasons and also consume much less gas. Maybe a large CO2 cartridge in the wing would do the trick. In which case the system wouldn't necessitate a pressure connection across the wing root, which would also be a good thing.