Re: Toroid Design

> The two existing toroids are made from 5" diameter corrugated black
> drain pipe bent into a circle around a .25" thick acrylic disk.  It is
> covered with clear packaging tape then aluminum foil tape.  Does this
> pipe come in larger diameters like 8" or 10"? 

Yes it does. Call up an irrigation supply place or a larger plumbing
wholesaler. Here in LA, Familian might be one to start with. However, the
stuff is pretty stiff, and you'll have a very tough time bending it into a
4' diameter torus, unless you do some surgery on the inside of the bend to
remove some plastic.

Why not go with a tube frame scheme like Gregy Leyh used on Electrum (and
Nikola did on Wardenclyffe, for that matter).  Light weight, good
performance, etc. If you could find some nice soft, cheap aluminum tubing,
it would be almost idea.