I am using 3.03 firmware on a 2.5 board in an elevon x-8. The plane flies well in manual, stabilize and does a good job following waypoints in auto and rtl. My issue lies in fbwa. The plane is super stable and I have no control authority to pitch or roll the aircraft. I have tried autotune with no success. I have verified correct control movement on the ground. I even tried upping the p gain to match the control throw of manual on the ground. When airborne, it behaves as if the "nudge" is working but no real control authority. I feel that I am missing something simple. I had this problem a couple years ago on an older 2.0 board. I never got the problem solved. I have restored all defaults and ran setup again with no improvement. What am I doing wrong? Thanks in advance.
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Yes those parameters are defined. Great graphic. I think I am using delta wing/elevon tx mix instead of flapperon. I am not sure the benefit of using flapperon then setting up 2 mixes to accomplish the delta/elevon function. I do have some of the elevon boxes checked in mp to make everything work right. Maybe Ill start over using the graphic as a guide. It seems that it should work either way??
One last question. If I have activated the elevon mixing function in the apm shouldn't I be able to leave the transmitter in a normal wing mode with no mix? All elevon style mixing would be accomplished in apm? I am understanding that if the mix is accomplished within the apm then none of those boxes need to be checked. Is this correct?
@Richard Burd 2 Great illustrations, I have never seen those. @ Scott Fitzgerald Here is another place to get parameter files http://plane.ardupilot.com/wiki/flying/tuning/configuration-files-f...
The parameters listed for the x8 are fairly close to default. The plane seems to have good stability and response while navigating waypoints, just no override in fbwa.
Hi guys, did any of the suggestions above fix the problem ?
I have been helping a friend get a Talon V-tail APM:Plane working at the flying field, but he also has a situation of good manual mode control, but nothing happening in FBW-A. Auto-tune is not possible with no initial control. In his case the throttle drops to low in FBW-A and stays that way too regardless of TX throttle stick position.
Martin
I had similar issues with my fx-61". Have you tried increasing the "MIXING_GAIN"? this worked for me. I know its not recommended to change while flying, but that's how I did it.
link: http://plane.ardupilot.com/wiki/arduplane-setup/first-time-apm-setu...
Thanks for the response. I am using the elevon mixing in the transmitter. I have also checked the elevon box in the mp setup page and checked all the boxes to make the controls and stabilization work the right way. Is this correct? I have never messed with the mixing gain. How much did you increase it? Also, on the ground I can flip from manual to fbwa and have set the p value so that the controls move the same amount. Shouldn't this be a good place to start? It is like I have no stick priority over the stabilization.
it sounds like you have the same issue I had. I ended up doing the mixing on the APM (no elevon mixing on the radio). I increased my to 1.0. On the ground it looked like i was getting the same amount of throws in STAB and FBWA, but in the air is completely different.
I initially had the elevons set on the radio and found that I had more control with the settings when I did everything on the APM via Mission Planner.
I know we have different air frames (I have a FX-61), but I can upload (when I get home) my parameter file for you to compare. I still have a few more parameters to correct on the max bank angle, but everything else is rock solid.
If anyone else has input please chime in.
I had a very similar problem with my FX61. Turned off the transmitter mixing, upped the mixing gain to .8 or .9, and it was pretty much solved.