Mabou2
Second Officer
Flight distance : 811257 ft
United States
Offline
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Labroides Posted at 2017-5-23 05:11
This suggestion is most unlikely and what evidence we have does not support it.
Since the P3 series, Phantoms are not susceptible to VRS.
And if VRS was involved, we would be seeing lots of descent in the flight record and would expect to see flight data continuing and giving a record of the fall.
Hi Labroids! You rock.
Well, I didn't research the data, I only know of my own experiences, coupled with the obvious fact that descending with the P4 is clearly a rougher flight than ascending. It makes sense to me that the rough descent on any flight indicates that the prop wash is a player in the stability of the craft... and given the delicate stability of a small 4-prop craft being buffeted by its own prop wash, that it might not be too difficult to go outside of spec to disastrous effect.
In the video, you can hear some or all of the props (powered) at high speed after it flipped and sped to the ground, so the motors were still running (at least some of them). If only two (or maybe three) motors were running, I would imagine the bird would have been tumbling in the air on its way down, not driving itself quickly and evenly toward the ground.
OBVIOUSLY, I don't really know what actually happened, just sharing my own experiences of having a near flip while descending. Keep in mind that sometimes the data only gives part of the story, especially if something occurs that goes outside of spec that can cause the data to be misleading.
Question in support of the data... does the data show what the status of the motors were at any given point? Just curious (and I don't know how to read the data myself) if there was a momentary power-down of one or more motors that might have initiated the flip..
Labroids, you are greatly appreciated in this forum buddy. |
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