- May 26, 2023
- west aus
Nothing was attached.csv log included can someone please explain why
Nothing was attached.
But rather than a CSV, it would be more useful to attach your .txt file or a link to the Phantomhelp or Airdata report for the flight.
You launched from high above sea level, flew out over the water and descended towards the water.
The drone has always had a shifty sensor on the bottomYou launched from high above sea level, flew out over the water and descended towards the water.
For a lot of the time after 1:58.5, your VPS sensors were indicating something just 0.3 - 0.6 metres below the drone.
There are indications that this was not a genuine height reading.
Did you have something fitted under the drone that might have blocked the VPS sensors?
At 5:01.8 you held the left stick fully down for a second.
The combination of the false low VPS indicated height and holding the left stick fully down overcame landing protection and initiated the autolanding.
You should have been able to cancel the autolanding by holding the left stick up, but you only did that for less than one second at 5:04.8 and otherwise left the drone to continue landing.
Another problem that didn't cause the loss of the drone, but could have in other circumstances was that you started with a battery that was already partially discharged.
Doing that, the % indication gives you a false idea of how much is in the battery.
At 3 seconds, on takeoff, the cell voltage was already down to critical low voltage level (3.2 volts).
Within a few seconds you switched to Sport Mode and pushed the right stick full forward which dragged the cell voltage below critical low voltage level.
"watery demise" - OMM you never disappoint and you have a way with words. : )@slabcharger , to sum it all up from the wonderfully detailed analysis from the posts above ,
and to explain why ,then the only conclusion for the drones watery demise was pilot error
these things happen
I wasn't there, so I'm not judging. Just saying, in a panic situation it's often difficult to recall exactly what happened and when which buttons were pushed. The flight log says what it does.no possible way. [...] i can assure you wasnt my error .
Obstacle avoidance sensors, or VPS sensors? Can the VPS sensors even be switched off? Either way, it doesn't matter as you say sensors were enabled.i even had the sensors on which i never do.
without them on yes hold down and it will land . but on they want you to swipe to confirm.
My Mini uses the DJI Fly app, whereas your Mavic2Pro which uses DJI GO 4. So there may well be differences in functionality.I don't know how it works with your Mavic2Pro, but if my Mavic Mini is within 2ft above any obstacle detected by the VPS height sensors (even mist off waves or waterfalls) and the throttle is held full down, that commands an auto-landing.
I have the vague recollection that with the Mavic 2 VPS can be switched off......but it is a vague recollection.Can the VPS sensors even be switched off?
If, as has been suggested both here and in the DJI forum, the auto landing was triggered by the combination of VPS reading and down stick, then has anyone else verified that the action i.e. the resulting landing-protection auto-landing, can be cancelled by a screen button action?after it went into auto landing i tapped the x 50 times
Exactly. You can push the button on screen and swipe to confirm you want an auto-landing from any desired height. If you start from a high enough altitude you'll have plenty of time to reconsider whether you want to press the X button to cancel the landing.If, as has been suggested both here and in the DJI forum, the auto landing was triggered by the combination of VPS reading and down stick, then has anyone else verified that the action, the resulting landing, can be cancelled by a screen button action?
Normally I doubt anyone has the time to do that.
For example, starting at 1:13 in the video below, I recently demonstrated the landing protection feature with my Mini. Holding the throttle partially down will slowly lower the drone only until the VPS height sensor detects it is 0.5m (2ft) from the surface. Even if I continue to hold the throttle partially depressed, landing protection prevents the drone from descending any further. But, if I then push the throttle all the way down, that triggers auto-landing and the drone will automatically land itself. (The gimbal on the Mini automatically rotates the camera up to horizontal to avoid sticking the lens into the ground.)The above said, there is plenty of evidence that the correct response would have been full throttle ....
no possible way. [...] i can assure you wasnt my error [...] it was safely high. a lot higher than i get because surf wasnt even amazing.
I don't and didn't doubt that that from "on high" an auto landing can be cancelled via the screen button but I am curious about whether or not the landing protection landing phase can be cancelled via a screen button press. The two? 'sorts' of auto landing need not use the same rules.If you start from a high enough altitude you'll have plenty of time to reconsider whether you want to press the X button to cancel the landing.
With drones that use DJI Go 4, the VPS can be enabled/disabledCan the VPS sensors even be switched off?
It was giving a constant false reading of 1-2 ft, despite the drone ascending/descending 20 ft or more.Was the VPS height sensor measuring that height from the actual top of a wave, or from the spray coming off the top of the wave?
I don't know. It still kinda makes sense.It was giving a constant false reading of 1-2 ft, despite the drone ascending/descending 20 ft or more.
This is not reading spray or anything real.