compass errors

[Jean-Pierre Jacob]

In less than an hour of flight, the compass indications of my Dynon Skyview vary from - or - 45 degrees compared to the true indications of my various GPS compasses. A new calibration does not change that. The initial values are good and then diverge quickly from the first turn. Does anyone know the solution to this ?

 

[DBRV10]

Have you done an on the ground N/S/E/W swing and saved it, and then done the in flight tuning and saved it?

If it is a tailwheel aircraft, did you do the swing in the flying attitude?

What kind of aircraft, where is the ADAHRS mounted? Where are batteries and or large electrical current carrying cables located relative to the ADAHRS?

 

[Jean-Pierre Jacob]

Thank you very much for your response.
I am French and I apologise for my deplorable English
I didn't do any calibration in flight but I'll do it!
My plane is not a tailwheel
It is an Ultra Light Aircraft, a G1 built in France by G1 aviation. This is the first time that this small company install a Skyview Dynon and they turn out to be totally incompetent and especially very inattentive to my problems ...
This aircraft has an all-metal structure made of an aluminum alloy.
The ADHARS is away from the battery. It is behind the cockpit, behind the seat and i see any large electrical current carrying cables located relative to the ADAHRS
Thank you
Jean‑pierre

 

[DBRV10]

My French is rather average too. Besides usual greetings and counting to 10.

Download the Installation guide and have a read of that. It will be much better than trying to understand us folk who use english poorly

 

[Jean-Pierre Jacob]

Thanks for your help and advices
Jean-Pierre JACOB

 

[Dynon]

You might double-check that the ADAHRS is oriented correctly. That is - with the tabs facing down, and the pneumatic connectors facing forward (electrical connection pointing towards the rear of the aircraft).

Also, yes, make sure to perform the complete in-air calibration routine (although, if the ADAHRS or optional magnetometer is relatively well situated, you shouldn't be seeing the drastic effects that you have reported here).

 

[Jean-Pierre Jacob]

I tank you for your precious advice, I will make an in air calibration, I am already sure after this calibration my Dynon will finally give me the good cap.
With m’y best regards
jean-pierre Jacob