AG0N-Gary
First Officer
Flight distance : 700846 ft
United States
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After some close examination of GoogleEarth, it does seem to be a pretty good mystery. In order to lose RC signal, something would have to block the signal. In order to lose GPS/GLONASS, you would need to lose both system's satellite signals. Severe microwave interference, or antenna blockage on the drone might cause that.
It's interestingthat the wind was a constant 29MPH, according to HealthyDrones. That's high wind and there was considerable load on the battery for all of the outbound trip. When the turn was made over the beach to head back HOME, the return speed could have been quite high because of the tail wind.
Looking at GoogleEarth street view, I see those tall shadows are from some new buildings that are very near 200 feet or more. There is also possibility of construction cranes in the area if there is more construction, but you would know more about that than I, since you are there.
Because of the way RTH works, IF it had gone to RTH mode, it should have flown straight back to the home point AT THE ALTITUDE IT WAS AT (262 feet), because that is higher than the RTH altitude you set (80m=212 feet). If that apartment building is higher than 262 feet, it could have crashed right into it. The building would likely have blocked the signal from the RC. Why it went off toward the lake I cannot hazard a guess. Things seem to point at loss of GPS/GLONASS or compass.
All ground elevations are around 30 feet or less, on GoogleEarth, so a tall building, tower, etc. are the only things that are going to block the signal.
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