T
TYCORP
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This is the footage cached on the DJI Pilot app. (Director sub app)How did you get the POV video if the copter ended up in the water?
This is the footage cached on the DJI Pilot app. (Director sub app)How did you get the POV video if the copter ended up in the water?
Blade, do you know what a "SPEED_ERROR" is?
The only two sources for speed are going to be GPS and VPS as far as I can guess. An accelerometer could give you an idea of speed but in the wind it's going to be noisy as all get out.
How would vps know speed? It has ultra sonic and a visioning camera which does not calculate speed..
Something else interesting is that in the second set of jolts at 1:37, you can see the frame in the camera. The red compass arrow on the map jolts to the left, twice, but you can see from the video that the Phantom frame actually jolts to the right.
I'd bet a lot of money nothing hit it and the P3 did that itself.
- The horizon was way off beforehand. Symptom of bad compass data.
- The heading in the animation flips about 45 degrees at 0:39. Symptom of bad compass data.
- The gimbal keeps twitching, losing yaw position. Symptom of bad compass data.
- The gimbal is then flipped to the other side. Symptom of bad compass data.
- TBE ensues. Symptom of bad compass data.
- COMPASS errors reported in data. Symptom of bad compass data.
when it responds yesQuestion. When or if this sort of thing happens, would it be beneficial to shift to ATTI mode and take it back home?
calibrated in the park prior to this flight as well, park, no keys, phone metal etc.It does it at 0:39 as well.
Tyler, where and how did you calibrate compass? In a field? Car park? Sidewalk?
Thanks!! maybe when DJI pick up the phone I can send them this.0-39 seconds - flying normally in GPS mode
39 seconds it tilts aggressively and switches to P-Opti and P-ATTI mode back and forth
45 seconds - User switches to ATTI mode, user does not push the sticks and lets the bird float with ATTI mode (which is why bird is facing front but flying back due to being aimless.
52 seconds - RTH initiated but bird is STILL in ATTI mode, still flying backwards
1:01 seconds - Bird switches to P-OPTI mode, still not in RTH mode.
1:07 - RTH mode is enabled on bird. it switches direction to face the user and starts flying home
1:15 bird starts tilting to the left while facing forward as if there is a rotor out
1:23 Bird switches to P-OPTI mode and P-ATTI mode repeatedly until it remains in P-OPTI mode and starts flying backwards again, no user input on sticks
1:34 Bird rapidly switches between P-opti, P-ATTI and PGPS mode 5-6 times while flying backwards but no user input on sticks
1:36 Bird switches to ATTI mode and starts tilting aggressively right as user starts using the sticks
1:42 User stops using sticks and bird switches to P-ATTI mode and P OPTI mode and P GPS mode repeatedly
1:50 Bird sends abnormal compass signal and FPV and Compass and GPS signal is weak on screen
1:54 signal lost
You can calculate speed with optical flow. I am not saying it is. But it is possible.
It is _NOT_ flying normally 0-39 seconds .. look at the horizon. This was not a collision this was a failure, whether caused by a previous incident or not we can't say with the evidence we have. But I would stake my paycheck on this not being a bird hit.0-39 seconds - flying normally in GPS mode
39 seconds it tilts aggressively and switches to P-Opti and P-ATTI mode back and forth
45 seconds - User switches to ATTI mode, user does not push the sticks and lets the bird float with ATTI mode (which is why bird is facing front but flying back due to being aimless.
52 seconds - RTH initiated but bird is STILL in ATTI mode, still flying backwards
1:01 seconds - Bird switches to P-OPTI mode, still not in RTH mode.
1:07 - RTH mode is enabled on bird. it switches direction to face the user and starts flying home
1:15 bird starts tilting to the left while facing forward as if there is a rotor out
1:23 Bird switches to P-OPTI mode and P-ATTI mode repeatedly until it remains in P-OPTI mode and starts flying backwards again, no user input on sticks
1:34 Bird rapidly switches between P-opti, P-ATTI and PGPS mode 5-6 times while flying backwards but no user input on sticks
1:36 Bird switches to ATTI mode and starts tilting aggressively right as user starts using the sticks
1:42 User stops using sticks and bird switches to P-ATTI mode and P OPTI mode and P GPS mode repeatedly
1:50 Bird sends abnormal compass signal and FPV and Compass and GPS signal is weak on screen
1:54 signal lost
calibrated in the park prior to this flight as well, park, no keys, phone metal etc.
Not at this altitude and dji does not use the system for speed measurements.
when it responds yes
calibrated in the park prior to this flight as well, park, no keys, phone metal etc.
The horizon is often off on the P3. Mine is perfectly fine but the horizon is usually 5-10 degrees off during normal flight. Don't read too much into that.It is _NOT_ flying normally 0-39 seconds .. look at the horizon. This was not a collision this was a failure, whether caused by a previous incident or not we can't say with the evidence we have. But I would stake my paycheck on this not being a bird hit.
one of my helis has a flybarless controller with trainer mode. It keeps the bird upright, but it won't account for drift, which requires pilot input. I'm thinking the later part of the video was like this. But wouldn't it keep altitude even if he wasn't controlling it? It started pitching on it's own.
The horizon is often off on the P3. Mine is perfectly fine but the horizon is usually 5-10 degrees off during normal flight. Don't read too much into that.
Correct. That's what ATTI does. The bird should stay level but will drift with the wind. It will actually pitch and roll less without stick input as it isn't fighting the wind.
Disagree. Bad horizon is bad IMU and/or bad compass data.
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