pixhawk constant turn to left.

[pepper]

hello guys I posted this in APM forum but no one has been able to help me so far. maybe you guys can.

i have an Rctimer s1100 pro setup with pixhawk, x8r sbus, taranis with opentx latest firm. I bought it all from a guy that had it set up and ready to go. in the beginning I had a small yaw turn to the left but found one of my rctimer esc's capacitors had fell off. there are 2 on each esc board. I thought that would be the issue for the turn. fixed that and everything seemed to work ok. just every once in a while the issue of yaw turn.

a week ago my taranis crashed. turned it on, blue screen light up and that was it. had to pull the battery for it to turn off. so for the last week solid I have had to learn how to set the taranis back up never doing it before. HAIR PULLING EXPERIENCE!!! so that's all fixed and I was able to get my flight modes. stabilize, alt hold, loiter and RTL. I can't seem to figure out how to set up any more, like land. I really liked the land function!

testing today to make sure everything is working correctly. recalibrated the esc's, same with the TX through mission planner. everything started up great, lifted off great but had a yaw problem. there is a slow turn to the left and I am having to input about 50% right input to get it back to heading. landed, hooked backup to mission planner and increased stabilize yaw P from 4.5 to 5.5. same issue. no change. I am afraid to go any further in the settings. don't want to crash. can anyone help me out? I have done a few searches over the net but about the only conclusion I can come to is that I need to do the auto tune again. would that correct the issue? sorry for such a long post.

thanks! glyn

 

[JoeBob]

Not familiar with the frame.
Are all your motors level?

 

[pepper]

as far as i know... i have checked them before and im pretty sure that when i installed the new esc's that i made sure they were. i will check again when i get home though.

 

[Mactadpole]

You've done the radio calibration in Mission Planner I assume?
Have you checked your yaw trim on the Taranis?

 

[pepper]

yes sir. the calibration has been done in mission planner. the motors look flat, no yaw trim at all and everything is centered.

 

[Old Man]

If you can, obtain some small bubble levels from the hardware store. I prefer the small round ones with the bubble in the center. Set the copter up on a level surface, verified with one of the levels on the frame. Find some place on the motor or arm to set a level to check motor level. Check them all. The eyeball leveling method is really good at biting you on the butt.

You might hsve to cal the ESC's again too.

 

[hjls3]

i would also check all motor bearings, via feel and temp gun - if you have bearing going - it will show its face with yaw - especially if yaw is getting worse.

 

[pepper]

ok... so i went to lowes and got the 2 position level along with the 3 in line buble level. used the 2 position to stay on top of the multi then put the other level on the esc's, since they are flat and mounted under the motors. 5 were tilted to make a left hand turn, i was able to straighten them out. HOPEFULLY.... this will fix it. we have more rain in the forcast so no testing till it stops.
the multi has only had about 10 flights so im not to worried about motor bearings but i will check them the next run up.

 

[crayfellow]

what about something simple like your compass orientation? anything get bonked while you were setting up the radio, etc.? Keep in mind the orientation of the pixhawk as well as the GPS/compass unit are meaningful to the offsets. Check it in Mission Planner to see if it's true.