APM 2.5 peak vibration

Hi guys,

I need help to find out my problem.

I have a quad on a sk450 frame with apm 2.5, FkSry tx/rx, AfroESC 30a, 28-30s 900kv motors and neo-ublox gps.

I crash my quad last week. Apart the four propellers and some nylon spacers and screw, everything's else seems to be on shape.

I then rebuild my quad correctly and change the propellers. Before I used standard plastic props and now I putted carbon props.

My problem is now i'm not able to run the quad smoothly. I did a 3-4 minutes tests flight by keeping the altitude at max 8-9 feets and three times while the flight I got a "crazy" quad. I attached the IMU log...as you can see I got peak vibrations 3 times corresponding with my "crazy" sequence.

So now, i'm trying to find what causing this strange behavior. Before, with my setup, I have perfect vibration value. My APM is still on a fiber shock absorber anti-vibration set.

Is there a possibility that with my crash I damaged my motors and it cause more and more vibration on my quad ? 

I'm beginner in the quad world and was very happy of what I done with my quad...but now, I'm disappoint because i'm not able to find out my problem :|

What stresses me a little is that when I order the pieces I have to wait a 3 weeks for the shipping so I would like to be sure sure as much as possible before buying pieces.

Many thanks for reading.

IMU.png

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Replies

  • Have you balanced properly your new carbon props? they usually come very badly balanced.

    • Leonardo, nop, did not balanced the props. Probably my bad but I thought that because they are made in carbon I do not have to do this ?!

      I'll take a look of that.

      Is it possible that I have behavior like that by "only" having unbalanced props ?

      Since my last post I read a lot about bearing in the motor, is there another possibility of my problem ?

      Thanks,

      • Moderator

        Noooh, carbon definitely need balancing just like all props.  

        Vibrations from an unbalanced prop show up differently at diff RPM, so they may have seemed good, but caused problems later.

        A crash also could have caused a nick or other damage to the props to make it worse.

        Prop vibration also wears out motor bearings, so this could have been getting worse also.

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