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Hexa Yaw Problems

Posted by Dusty Starbucks on February 2, 2012 at 12:30pm

Complete noob here and need some help.  I bought a jDrones hexa (big motors, 10x4.5 blades).  I am running 2.3 (which may be a problem after reading about it's premature release).  My copter did this with 2.2b4 as well.  

The issue is that the copter wants to spin around the yaw axis continuously.  I have reset, erased, recalibrated several times and like I said used two different sets of code to the same end.  I can lift off, but the copter rotates CW at about 10-13 rpm. 

Also the yaw seems backwards.  I am using a Spektrum DX8 where the sticking left outputs low sig and sticking right outputs high (which seems right).  The copter is rotating clockwise but seems i can get it to yaw CCW with sticking right yaw.

 

I have many problems and issues to get through, but this one keeps me on the ground and it's pissing me off!  So, any help......

 

thanks

 

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Replies

  • Dave February 4, 2012 at 9:42pm

    Not a Hexa expert, but I'll have a go.

    Have you tried holding the Hexa, raising the throttle a little and moving the frame around in Yaw to see if the motors respond as they should?  (Obviously be v. careful of the props)  While you're at it, check on the Spektrum that the rudder does the right thing with the motors and in the correct direction.

    The group of 3 motors rotating in the same direction should act together speeding up or slowing down with the other group doing the opposite.  If you rotate the frame to the right, or move the stick to the left, the CW-rotating motors should increase in speed.

    Another thought is that vibration can mess up the gyros and cause odd effects.  Are the props and motors well balanced?  Again, you'll feel this if you hold the frame while it's running.

  • Dusty Starbucks February 4, 2012 at 4:41pm

    Went out to a more open area, took off and the bird started a CW rotation that by the time I was at 15 ft alt, the rotation on the Yaw was about 60 rpm (time revolution per second).  It had drifted about 50 ft in fromnt of me so the landing ended with an inevitable blade break.

     

    I am surprised that there isnt someone here that would have any idea about what could be happening.  The bird seems pretty level on take off.  This question can't be without an answer or even a suggestion can it?

  • Dusty Starbucks February 3, 2012 at 11:33pm
    Tested again tonight. Was able to keep the bird up a little longer in my limited space. As it comes off the ground it yaws CCW, within a few seconds it is going CW. Is this a yaw setting problem that can be tweaked?
  • Dusty Starbucks February 2, 2012 at 10:44pm

    I tried some more things to see if it would work.  It's kind of strange.  I crank up the throttle to just below take off and it starts rotating CCW.  Then I back the throttle down a little and move it up again and it starts rotating the other way.  Trim has zero effect on what is going on.  Anyone?

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