posted on Feb, 11 2009 @ 02:22 PM
I also think this is a solar powered balloon.
How it's done
I used to make these often in my youth. You need a few of those very thin, black plastic bin liners. The larger the better. Using sticky tape, you
open up the bottom edge with scissers and tape the open end to the top edge of another liner. Repeat this till the tube is about three meters long. On
a hot sunny day, inflate the balloon by running with it's open end. When inflated, seal the end up with tape. Launch it into the air. As the air
inside heats up, it will become lighter than air and will rise to a great height. It looks exactly like this video.
Copy-pasted from duplicate thread.