the pipe idea kind of reminds me of the cigar shaped ufo's
that are reportedly seen.

and it seems that all other ufo's are saucer shaped , which
could lend itself to possibilities of centrifugal forces in a centrifuge.

none of them seem to be sphere shaped that I have seen photographs of.

even though a sphere shape would seem to be best for space travel.

the German Bell

I believe that according to its shape the Bell was driven by a
hydrogen turbine that powered a centrifuge and its exhaust gasses were trapped in the centrifuge.

it is reported that the Bell had counter rotating barrels one inside the other , this would provide for stability.

but these are just my thoughts on the German Bell and what
purpose it could have served.

I believe that this was a working model for testing a propulsion device that was being developed by the nazis.

that was used in several nazi aircraft.

3/4 inch of dust build up on the moon in 4.527 billion years,LOL and QM is fantasy science.