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Looking outside the box..
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It's in the cloud: higherlogicdownload.s3.
amazonaws.com/
It's funny, corrugated airframes fell out of favor in the 1930s, vortex generators are debated even today.
Now we have riblet films. ('four year lifespan' vs 'no additional maintenance')
The interface between the airframe and the atmosphere extends down to the quantum level. That means there is opportunity to engineer a nano-scale meta-material that creates a vacuum at the surface.