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Permalink Reply by sam d on July 25, 2011 at 12:15pm

I guess its because of the compass, but im not 100% sure, someone else can confirm it. As far as i know, the quad is not able to know its direction accurately without the compass (gyros are not good enough because of drifting inaccuracies), that's why you should not try position hold without the compass.

btw, do you have a sonar? or your using altitude hold with only the pressure sensor?

 

sam

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Permalink Reply by Max Xam on July 26, 2011 at 12:47am

Well after some testing i think i found the reason of the strange yaw behavior. I did have a compass but after a earlier crash it stopped working. I did de-select the compass in the setup but it was still connected to the apm.

The compass was stuck on one value but sometimes it changes, 90 deg!! So i disconnected the compass and will try again.. after the rain.

 

@sam_d yes i do have a sonar. Alt-holt is rock solid.

 

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