Where do I start to search for a problem I don't know if exist? - RC Groups
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Apr 29, 2012, 02:08 PM
Registered User
Denominator's Avatar

Where do I start to search for a problem I don't know if exist?

I had my X525 quad running very stabil, with a KK 5.5 board and KK 4.7 firmware.
In a moment of looking the wrong way, two of the props hit a branch and the the quad tumbled down inside the tree.
I would call it a soft landing, nothing really broke, except two two props that I now have replaced.

Now that the quad is up and running again, it's far from stabil. It has some small sign of twisting in the yaw axis, it moves left to right, right to left, back and forward, forward and backwards without any real pattern, nothing I can point my finger at and say "see what it's doing, I must do that to fix it!"

The x525 is straight, no bends or splits, motors run good as far as I can see, the FC should not have been damaged, it didn't hit the ground under the tree hard, it just "fell out" of it

What may happend making it fly this way? I must add that I waited some time to recieve the props, so the outside temperature has changed from cold to warmer, could it bee that I need to readjust the gyros? I know the KK5.5 FC gyros are responding to cold weather.

Can one of the motors be bad as the props hit the tree?

Any sugestions are much appreciated!
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Apr 29, 2012, 04:23 PM
Registered User
Denominator's Avatar
I think I know why it does what it does. One of the motors that hit the tree has a slight vibration, and maybe a very slightly bent prop axle.

I will buy 4 new motors to make them match
Apr 29, 2012, 05:26 PM
Registered User
David Jenkins's Avatar
You could check that the silver-coloured cover hasn't come loose on one of the gyros - it has happened to some people's boards in the past.

Or it may be that one or more of your props (or motors) has become unbalanced, and the vibration is upsetting the gyros. Perhaps you could check the balance of your props for a start.

Oops! You've worked that out already!
Apr 29, 2012, 08:24 PM
Registered User
OLDTOM's Avatar
If it is a kk, 5.5 it will have the yaw gyro mounted on a stand off board.... check that this board is not loose and does not have a broken solder joint... this can cause very strange things to happen after a soft crash..


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