On 11/02/2016 07:57 PM, Jeff Liebermann wrote:

Interesting that even balloons
were sufficient - so one could launch small weather balloons that have a
maximum height (pin pop by altitude) around a drone? Safe at airports...

Those have also been invented and are known to work well. They're
called "barrage balloons".
https://www.google.com/search?q=barrage+balloon&tbm=isch
Unlike the drone propellers getting tangled with the rubber balloons,
the WWII version had the German bombers smashing into the tethering
cable, suspended nets, or sometimes cables strung between balloons.

I remember a barrage balloon site just across the fence from the farm
where I grew up on the North Downs in the UK, but I don't recall hearing
whether that particular installation brought down a German plane. My
mother and I went to stay with family far away from London for part of WWII.

Perce