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Cesna Pixhawk Crashed in FBWA . Autopilot wrong???

Posted by Wilson Frias on September 4, 2014 at 11:20am

Hello everyone.

Today I tried to fly a small Cessna 182 with pixhawk and everything seemed fine until I activated the FBWA mode. I started flying manually and take off with difficulty because it is a little heavy, but when I thought was stabilized I activated FWBA and the aircraft went crashing to the ground. Reviewing the log I see that the commands I was sending to pixhawk were completely contrary to what I was doing with my radio.

I'm right ?? below the flight logs to see if someone can help me.

Thanks in advance

2014-09-04 12-04-44.bin

2014-09-04 12-04-44.kmz

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Replies

- - - - Wilson Frias > Andre K. September 24, 2014 at 5:59am
        
        Thanks Andre:
        
        Here is a link to a video, so please you check and let me know if this time is correct
        
        Thanks in advance.
        
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        Wilson Frias > Wilson Frias September 24, 2014 at 8:25pm
        
        Dear Andre:
        
        Here is a link to a video with the behavior of the elevons. Could you please clarify if it is appropriate, taking into account the limited one of the elevons in response to the Pixhawk roll movement.
        
        I do not wanna crash again.
        
        Thanks in advance
        
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        Andre K. > Wilson Frias September 24, 2014 at 11:26pm
        
        yes, that's correct.
        
        now, the second step: set up RC pitch/roll reversing to work correctly in manual mode.
        
        Wilson Frias > Andre K. September 25, 2014 at 6:03am
        
        Thanks
        
        MarkM > Wilson Frias September 24, 2014 at 6:08am
        
        No that's wrong, you've changed the pitch (elevator) and should have changed roll (aileron).
        
        When you tilt the pixhawk up the elevons should both go down.
        
        When you tilt the pixhawk down the elevons should both come up
        
        When you roll the pixhawk to the right the right elevon should go down
        
        When you roll the pixhawk to the left the right elevon should come up
        
        Wilson Frias > MarkM September 24, 2014 at 11:08am
        
        Thank you MarkM
        
        This is how stayed. Video
        
        Please let me know if the problem is now solved.
        
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        MarkM > Wilson Frias September 24, 2014 at 12:08pm
        
        The elevons are both responding in the right directions so should now fly ok in fbwa. You will almost certainly need to do the autotune on it though as I found my Cessna was very sl8w to respond before I did the autotune.
        
        I dont know how elevons are supposed to travel so is it normal for one elevator to have more travel than the other? Or do you need to look at your mixing a little more?
        
        I know on my plane the ailerons both travel the same distance (in opposite directions) when I bank left and right.
    - Wilson Frias > Andre K. September 23, 2014 at 12:43pm
      
      When I checked the plane FBWA, if the nose down the ailerons moved reverse to rise again. the same for lateral movements.
      
      I filmed a video with it.
      
      Here is the log.
      
      2014-09-23 12-42-26.rar
      - Andre K. > Wilson Frias September 23, 2014 at 2:08pm
        
        "moved reverse" ? - are you trying to say it's working correctly or wrong, if wrong (which I am pretty sure of) then you need to do what I wrote in "2:" two weeks ago or so.
        
        Wilson Frias > Andre K. September 23, 2014 at 2:58pm
        
        I'm sorry by my poor English.
        
        Please see my video
        
        https://www.dropbox.com/s/83g35tlhhhfrz2l/Comportamiento%20Pixhawk%...
        
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