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Hoverfly trim change during flight

Discussion in 'General Drone Manufacturer Discussion' started by octocine, Apr 11, 2013.

  1. octocine

    octocine Member

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    Posted by octocine, Apr 11, 2013 #1
    I've encountered a strange new phenomena. I've been flying the newest firmware for several weeks and all is well, but recently I am experiencing some drastic trim changes during a flight (in completely calm conditions). I can trim it out at the start of a flight and it hovers perfectly, but after one short flight I have to trim a DX8 about 8 clicks to make it hover again and I am almost at the limit of the elevator trim. Any ideas?
     
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  2. yeehaanow

    yeehaanow Member

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    Jan 11, 2012
    Posted by yeehaanow, Apr 11, 2013 #2
    Could your battery placement be affecting balance, and change each time you swap batteries?
     
  3. octocine

    octocine Member

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    Posted by octocine, Apr 11, 2013 #3
    The trim change is occurring within the same flight, so nothing has changed on the helicopter. I have a precise method of attaching the batteries so they are in exactly the same place on each flight. I have 700 flights on this board and nothing like this has aver happened before.
     
  4. Rasec

    Rasec Member

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    Sep 27, 2012
    Brazil
    Posted by Rasec, Apr 12, 2013 #4
    It seems that the HFP has its own life. I've been flying very well since it launched the firmware v.4.8, and the gain of the plate was 60%. In recent flights the aircraft began to vibrate (not made ​​any change in the aircraft) and had to reduce the gain to 34%.
    I honestly was very disheartened by this.
     
  5. octocine

    octocine Member

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    Posted by octocine, Apr 12, 2013 #5
    Many flights later and trim is still changing during flight. I am working in the arctic, so the cold may be the problem. Temps around -5 F, but I have flown in the cold before and never experienced this effect.
     
  6. yeehaanow

    yeehaanow Member

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    Posted by yeehaanow, Apr 12, 2013 #6
    Does the trim change always happen in the same axis? Roll or pitch... If so I would suspect an esc/ motor, especially with 100's of flights.
     
  7. octocine

    octocine Member

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    Posted by octocine, Apr 13, 2013 #7
    Yes, the change always occurs in the pitch axis. I'll try to swap ESCs and motors and see if that eliminates the problem - thanks!
     
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