[Floreos]

I don't see how the bernoulli effect is supposed to have any correlation to a BB rolling in a tube. You're comparing wings and balls here. And obviously when a wing touches the ground and changes angles it's going to send whatever it's attached to in a different direction. It's like you're saying if a planes wing fell off or was damaged mid flight that it's some how comparable to a ball spinning. This ball is being held to the top of the barrel via "the magnus effect" and pressurised air or Gas that it is rideing on.

You would be better off comparing it to a wheel.