Originally Posted by
KelvinD
I wonder how easy it is to identify an object passing you at 150mph and perhaps below or above you?
While watching departures at Heathrow recently, I watched as a Buzzard turned up and began circling to the South of the last couple of hundred yards of the runway. The bird's pattern was slightly elliptical so took the bird closer to the runway with each circuit. An aircraft departed and the bird was below and slightly to one side of the aircraft. The bird wasn't bothered by the sight and sound of his huge brother roaring by and continued focusing on his potential prey. A second aircraft then departed and this time the bird was slightly closer and slightly higher than previously. About this time, the controller was heard warning departing aircraft of the possibility of a drone being flown in the area. This warning was soon modified to include "but reports say it may be a bird", which of course it was. This incident highlighted how difficult it must be to identify something the size of a buzzard, 100 ft or so below and to one side and appearing in your peripheral vision for a matter of a second or two.
I once caught a Red Kite racing a landing G450. I guess the Kite decided it couldn't eat the G450 so cleared off:
Ship Photos, Container ships, tankers, cruise ships, bulkers, tugs etc
You are doing 80mph on the interstate and you pass a half brick or road kill in your lane - insufficient time to react but you will usually be able to say what it was you saw. Yes there will be some cases where a hawk in 'hover' prior to the stoop could be mistaken for a small UAS but in a lot of cases if close enough to be 'providence that it did not hit' the pilot will recognize what it was the aircraft just missed.