No. I didn't realize how old this thread was before I posted my comments above.
Thread age kicks my butt again. *sigh*
Thread age kicks my butt again. *sigh*
might have been an old thread but you revived it with a great response!
I think you should re confirm your 60% number.It is a fact that high altitude has an adverse effect on performance. The air is much thinner - at 13000 feet it is only about 60% of the density at sea level. At some altitude you wouldn't have been able to fly at all. Obviously you were able to fly but it would take a much larger percentage of your available power than at sea level. You would have had much less performance left for maneuvering. A quad uses that remaining power to control stability and to maneuver. You may have just run out of maneuver margin. A slight down slope wind could easily be greater than you could over come.
I think you should re confirm your 60% number.
You know, got to thinking about some these mysterious fly aways. Is it possible that a pilot could inadvertently get into the position where the iPad is blocking the radio aerial line of sight.