Yaw or not to Yaw?

Discussion in '3 Axis Gimbal' started by Janne Hoglund, May 9, 2014.

  1. Janne Hoglund

    Janne Hoglund Member

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    Hi friends.
    Is there any possibility of flying and filming, in a perfect straight line for 150-300 m without having any unwanted yaw movements from the Cinestar itself? (Standard C8 with MK stack, QC motors. Navi and GPS on boom 1.)
    I find this very hard to do.

    Is the one and only solution to have a 3 axis gimbal, Mövi or other brushless, and that way let the gimbal even out the copters unintended and unwanted small yaw movements??

    Any input is welcome :)

    Regards from rainy Sweden.

    /Janne
     
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  2. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Are you flying with both position hold and altitude hold enabled? If not, try that.

    Regards from rainy Oregon!
    Andy.
     
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  3. Janne Hoglund

    Janne Hoglund Member

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    Thanks Andy, and if Steve likes this I´ll have to give this road a bit more atension.
    But using both ph and ah does make the kopter sometimes vibrate to much, and setting the gyros for smother flight sometimes gives the old toilet bowling back...
    I have ordered the new ext compas and is hoping with al set I´ll get the Stability of Steves kopter :)
     
  4. Steve Maller

    Steve Maller UAV Grief Counselor

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    Janne,
    Thanks for the props. I’m not using the external compass yet. Hoping to get it installed this week and try it out.
    Steve
     
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  5. Janne Hoglund

    Janne Hoglund Member

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    Thanks Steve.
    Are you to thinking of placing the ext compas above the GPS?
    How high above the GPS? In Holgers pic it looks very fragile, not quite like the DJI setup ...

    /Janne
     
  6. Steve Maller

    Steve Maller UAV Grief Counselor

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    That’s part of why I’ve not installed it. Can’t quite make up my mind as to where it should go. Leaning towards putting it high up like Holger did, but I’m concerned about it being exposed, as well as it not being as stable. But presumably the goal is to isolate it from all the LiPo wiring and other stuff, so that seems to be the ideal spot.
     
  7. Janne Hoglund

    Janne Hoglund Member

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    Second your thinking Steve.
    Im also thinking it only sits on one screw so it is quite easy to mount and unmount while traveling.
    But it would be nice if Holger came up with some more rigid and better protected mounting thingi like the one DJI uses for its GPS-compas.
     
  8. Steve Maller

    Steve Maller UAV Grief Counselor

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    I’m ruminating on something more substantial (a fully-enclosed housing) that would protect everything (including the compass).
     
  9. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    I see a 3D printer in your future, Steve.

    Andy.
     
  10. Steve Maller

    Steve Maller UAV Grief Counselor

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    Can I print myself a 3D printer with a 3D printer? :confused:
     
  11. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    Yes.
    Unfortunately you then end up in recursive descent, never to be seen in this galactic quadrant ever again.

    Joking apart, though: "The 3D Printer that Prints Itself."

    Andy.
     
  12. Shane Moore

    Shane Moore Member

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    I don't use MK, but with Hoverfly I would use auto level and adjust the trim for forward flight at the desired speed then all you have to do is rudder until you're going in the correct direction then take your hands off the sticks. Definitely possible in calm air.
     
  13. Janne Hoglund

    Janne Hoglund Member

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    In calm air my kopter also works quite well most of the time :)
     
  14. Chris Fox

    Chris Fox Active Member

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    A completely straight forward flying shot is probably one of the hardest shots to do I think, any air movement will move the copter, which will be visible in the shot. Using a wider lens can alleviate some of this, but a tighter lens flying a straight line forward is challenging unless the conditions are perfect.
     
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  15. Andy Johnson-Laird

    Andy Johnson-Laird Administrator
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    I find that if I enable position hold and then "fly" the set point for the position hold, the Flight Control Board does a pretty good job of compensating for the wind. If I have AH on as well, I try not to touch the left stick to avoid inducing any yawing.

    Andy.
     
  16. Steve Maller

    Steve Maller UAV Grief Counselor

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    I'm going to try an experiment with waypoints and see if that might produce the desired effect. Looking for something to address some surveying needs, but it could work with video tracking, too.
     
  17. Janne Hoglund

    Janne Hoglund Member

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    Well for me if the resulting video looks like you have flown in a straight line thats my target :)
     
  18. Janne Hoglund

    Janne Hoglund Member

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    Glad to here this works the same Down under Chris.

    Regards.
     
  19. Chris Fox

    Chris Fox Active Member

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    I've learnt the only difference being in this hemisphere is that every iPhone photo is upside down on the FF forums, other than that the physics appears appears to be that same for all of us :)
     
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