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Abnormal altitude loss in althol when flying forward

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@Boxerone wrote:

Dear all,
I know that this problem has been discussed several times, both here and and DIY forum, but I am wondering if someone could help diagnosing this.
I have 3 different quadcopter and all of them suffer from altitude loss when in althold mode or auto.
I tryed several solution and now I am flying with a dome over pixhawk and the inlet of the baro sensor, has been routed (via a silicon tube) to the GPS antenna mast

so far, none of this solution solve or even mitigate the effect.....
What sound really strange is that it has bee always reported as a behaviour with high pitch angle and high speed, but in my case the speed is very low ... down to 3m/s
The result is the impossibility to fly in halthold and even worst in auto mission mode...

Any help or suggestion is highly appreciated!!!
https://dl.dropboxusercontent.com/u/40611810/2%2028-06-2016%2008-20-36.zip
https://dl.dropboxusercontent.com/u/40611810/19%2025-06-2016%2010-47-14.zip

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