Replies: 9 comments 31 replies
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It looks like you had a hardware failure (regulator), based on the way the GPS signal dropped off at the same time the RX signal was lost.. It can't be coincidence that the two happened together... Then it appeared to try and RTH for a few seconds. Then shut the throttle down. I haven't done any resent testing with MC emergency landing with loss of both RX and GPS, to see if it still works fine as it did a few releases back. |
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Could also have been interference from those antennas on the mountain top. I'm sure directional dish antennas would cause problems if you flew into the beam. The signal did actually recover after the emergency landing started and it dropped, possibly because the quad fell out of the interference. Either that or someone zapped it with an anti drone device, makes no sense the Rx and GPS signal failed at the same time. Not sure why the throttle dropped to 0. The altitude did still seem to be working but without a log it's impossible to know if it was still flagged as trusted, any log available ? What was Would also be useful if someone could check the failsafe stuff using SITL and a flight sim that includes drones (X Plane doesn't). I did test failsafe altitude control due to Rx loss but probably not with GPS failure also. I guess this isn't something people are too keen to test that rigorously because things get broken or lost if it goes wrong. |
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That was the flight mode you were in before the FS, so it went back to it. Did you have Airmode enabled with ACRO ? I assume you must not have. Other wise it would have fought to prevent itself from tumbling. |
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@Jetrell @breadoven After crash, I have checked quad. It seems quite OK with battery/airmode/GPS/RC signal. |
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@breadoven I have reviewed #9169 a) b) Is |
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@Jetrell @breadoven I'm quite confused. Please check https://github.com/iNavFlight/inav/wiki/Failsafe#setting-up-failsafe-with-return-to-home Does this mean Failsafe procedure has NOT been set to DROP, but it will surprise the multicopter to drop???? Is there any logic related to the code? |
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If hover throttle hasn't been changed from default it's likely to result in a climb in many cases. I guess it's a question of what's better from a safety point of view, a quad climbing and endangering aircraft or dropping and hitting things on the ground. I guess if it climbs it will run out of battery eventually and drop anyway so maybe the change I made needs rethinking to avoid an uncontrolled climb. You could check if hover throttle is still set to the default and revert to the Emergency Landing throttle setting for FS DROP, i.e. idle throttle. NOTE: There is a bit of confusion here because an Emergency landing with FS set to DROP but no Failsafe active (so just position loss during Nav) reduces throttle to idle whereas an actual Failsafe set to DROP simply disarms. Unfortunately this would be a problem for quads that do hover at 1500 ... so I'm not sure what the ideal solution would be here in that case. Ideally if a user has failed to set things up INAV should default to the safest overall action for 3rd parties which is to just drop during an Emergency Landing, a penalty I guess for not checking settings properly, especially Failsafe settings, which should be a priority, and Hover settings which you'd think would be fundamental on a quad. |
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Much more detailed info, please check here #9184 |
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I have got a crash when RC & GPS signal lost.
it seems
Step 1: RC signal lost
Step 2: GPS signal lost
Step 3: inav enter emgergency landing
I don't know why it lost balance and crashed, when emergency?
https://www.bilibili.com/video/BV17V4y1h7is/
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