Re:Lufthansa flight has near-miss with drone near Warsaw
by anigbrowl on Tuesday July 21, 2015 @04:35PM
(#9925589)
There are firms that build them specifically for industrial inspection purposes, eg Blue Bear Research Systems in the UK. Unless the witness was qualified (eg a pilot or surveyor or similar) I would take size/height estimates with a giant pinch of salt, most people are awful at estimating those things.
I was very surprised to learn that the "drone" seen above nuclear power plants in France has been discribed by a witness as to be ~7 meter in diameter, flowing at an altitude of ~200 meter, at slow speed and silently.