Richard Casady wrote:

On Tue, 16 Oct 2007 01:13:56 -0700, Ian
wrote:

How do you think helium balloons work?

Same as a boat, displacement.


You have me there. However, how many do you think are in use? I would
guess somewhere between zero and none. For all practical purposes they
don't exist.

What about the Goodyear fleet?


Myself, I like to fly small hydrogen balloons. Dry cleaner bags. You
dissolve aluminum chips in lye to get the hydrogen.

Really fun if you can get them to ignite at altitude.

Cheers
Marty