Peter Lynn's 7m diameter (!) Blow fish

This isn't a kite or a wind-sock.  It is a Bernoulii (sp?) device.  It is
basicaly spherical, with an opening at the front.  It fills up looking
much like a hot air balloon on it's side.  The top curved surface acts as an
airofoil, causing it to rise, until it clears the ground.  It continues to rise
until the lower surface (and gravity) pulls it down, so that it squashes on
the ground only to be lifted up again.  It's great fun for for the kids who
like to play underneath, so that the thing squashes on top of them before
taking off again.  I liked this so much that I plan on making my own
Bernoulii device.  So far, I have made a 5' diameter prototype and it works
well.  All I need now is (n x 100)meters of ripstop to make a big one.