APM and nose-up effect

Hello guys !

 

I have noticed a strange effect when I have equipped my GAUI330x with a APM

(see http://www.diydrones.com/forum/topics/gaui-330x-platform-1st-flight?commentId=705844%3AComment%3A221324)

 

 

In acro mode:

 

- no problem at low speed,

 

- Problem at high spped : it is difficult to maintain the Quad in fast translation:

  it starts to climb and decelerate during fast cruise, a little bit like fixed pitch helicopters that mose up to auto-regulate upto stationnary attitude.

 

Questions :

 

=> Have you noticed this nose-up effect on your quad during fast translation ?

 

=> software or parameters evolution (to reinforce acro mode) :

     - should I add something like Integrate part (acro used to be only proportionally driven by gyro) ,

     - or should I add a little bit off accelerometer drift cancelation (like stable mode).

       My idea is that Quad very slowy rotates to nose up due to speed,

       and this is too slow to be detected as an error by the gyro loop in acro mode.

 

Any other  idea ???

 

Thanks for your help,

Gilles

 

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