I thought that MAYBE I actually still had the paper those guys wrote--but no.
Memory sez they did an aluminum geodetic frame covered with sheet aluminum
triangles, all sealed with wax. I don't remember what stopped them--the sheets
or the frame collapsing, or all the joints leaking.

David

"DoN. Nichols" wrote:
A high school classmate made a year long project of building a vacuum balloon.
He had more success than I gather the physics teacher thought he would have, but
still no-go for positive buoyancy.

I was sort of thinking of doing it for a package to mail via the
USPS. Watch them try to figure out the proper postage on something
which was a one or two foot sphere, but which didn't show up on their
scales. :-)

I was thinking of perhaps a titanium sphere, and wondering what
the minimum wall thickness to sustain it against a vacuum. But I never
got around to it.

What did he use for materials and shape?

Enjoy,
Don.

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