strange YAW behavior

Hello there ! need you help :-)

got 2.2b4 Version on my Quad.

All fine : take off - stable

fly a bit - and suddenly when i want to change direction :

- yaw stick movement leads to oposite reaction....

Once the quad also started turning around 120 deg.

verry strange i know :-)

- Hardware is correctly set up and i can't find any reason for this strange behavior.

Any help is appreciated !

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Replies to This Discussion

Permalink Reply by Jan Schermer on January 23, 2012 at 2:21pm

I also saw this, with 2.1 and now with 2.2, but I think it's because the magnetometer offsets have been reset during upgrade and it needs more time to settle. Does it get better if you try flying longer? (And I think magnetometer offsets are only saved during disarm but not sure about that).

I also saw this when Yaw P (Stab yaw P) was not high enough to rotate, it moved a little in the right direction, then compensated stronger in the other - probably overcompensated by Rate Yaw P.


DeveloperPermalink Reply by R_Lefebvre on January 23, 2012 at 2:45pm

I have a similar problem with a helicopter.  It seems to only do it when I command right yaw.  First it jumps a bit to the left, then it starts moving right.  Yawing left works fine, however.

Permalink Reply by Jan Schermer on January 23, 2012 at 3:07pm

exactly what I saw - I decreased Stab Yaw I, increased Stab Yaw P and it was gone... it always yawed ok to the left but not right :-)

Permalink Reply by LAIC on January 23, 2012 at 10:41pm

the stange thing is that it flyes stable with all other axis. I've replaced APM and Magneto....

do you think it can be the GPS or the 2.4 GhZ receiver ?

thanks


3D RoboticsPermalink Reply by Chris Anderson on January 23, 2012 at 10:56pm

Check to see if all your motors are totally straight. 

Permalink Reply by LAIC on January 23, 2012 at 11:11pm

Hi Chris

all super straight....

- wold it fly as stable otherwise ?

tons of thanks !

Permalink Reply by Jan Schermer on January 23, 2012 at 11:14pm

So you're flying in Stabilise mode? Increase Stabilize YAW P and try - really. It will work ;-)

Permalink Reply by LAIC on February 17, 2012 at 4:25am

got latest 2.3 and still the same issue

YAW isn't working properly ; all other directions super stable.

could it be a receiver issue ?

thanks

Permalink Reply by LAIC on February 17, 2012 at 4:44am

receiver changed : same problem....

Permalink Reply by LAIC on February 19, 2012 at 7:35am

Hi Chris

one motor was a bit off-angle ; now it's strait and yawing well !

- strange but true :-)

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