Nice replies.
Roadam, the plane is cool what with Hydrogen fuel & all, but again I don't think we really need to get places fast for the most part. Sure if you got a time-constrained medical reason, but not to go from DC to visit Granny in Moses Lake Oregon and certainly not if there are more efficent means. Waste not, want not.
Pyro, the basic idea for the FBS is grand & beeeeautiful.

I think rather than the inner ring deck directly attached to any great circle inside, that all needs to be gymbaled so the FBS is free to rotate on any (many?) axis/axes.

It's going to want to tumble anyway, so we control that tumble and actually use it for motation because the pressure on opposite sides of a rotating sphere is differential. (looking for linkage on that.....

) Got one!
Quote:
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Originally Posted by Springlink
From a detailed computation of the flow field around a rotational sphere in extended ranges of the Reynolds number and rotational speed, the results show that, with increasing the rotational speed or decreasing the Reynolds number, the lift coefficient increases. ...
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SpringerLink - Journal Article
That's all I got...my brain is sore now on account of the thin air.

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semantics is not always just pedantic quibbling. ~ douglas r. hofstadter