hallmark007
Captain
Flight distance : 9812789 ft
Ireland
Offline
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It sounds like you picked up interference from somewhere it could be when simply putting drone on the ground, was it-placed on concrete could there have been anything metal in the vicinity or buried under the ground, could you have calibrated wrong highly unlikely but can happen, while you may have taken off many times from the same area it doesn’t necessarily mean there is nothing in your area that will cause magnetic interference, did you get compass error, IMU heading problems etc before crash, if you did I will try to explain below what can happen and how and why it can effect drone later In the flight.
You should also check the values of your compass in a safe place for the craf away from any possible interference, if it shows good values ie small green, it’s most likely what happened is explained below. If it has bad values then compass will need recalibration.
The best way I can explain this is. If you put your Aircraft on the ground in normal circumstances, start it up, then lift it up and turn it 90 degrees to the right both your compass heading and IMU will both move together 90 degrees and no problems.
If you put your Aircraft on the ground and there is magnetic interference only the heading of your compass will change, your aircraft will still take off. But when it clears magnetic interference compass will then move to correct heading which you would think was great. But No, what happens is IMU is then conflicted and confused because of this sudden movement by compass, so you receive IMU exceptional heading warning, your aircraft cannot deal with data conflict so decides to switch to Atti mode dropping gps in favour of compass simply because aircraft can fly without gps but not compass.
While I can’t be certain OP picked up interference from the ground or surrounding area it is the most common cause.
I have seen many cases where people start their aircraft in or on their car in their house and then bring it outside so damage is already done and we will see exact same warnings and and reaction from aircraft.
We all should check our compass when we start our aircraft and maybe more of this could be avoided, you can do this by checking the compass values in your app also check small red triangle in the lower left corner of your telemetry, it should be on the same heading as your aircraft. |
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