Gaui 330x rpm differences

I have been using a Gaui 330x as well as a test bench built to the same dimensions in order to gather some data about UAV energy use.  I have been trying to figure out why we are having trouble getting the quad to hover in one place.  It seems to generally move to one side or another.  Using the trim settings we can get it as stable as possible but still unable to achieve a consistent hover.

I have noticed that we generally have a difference in our rpm readings of adjacent propellers.  Two of our opposing props rotate at approx 20-40% less than the other pair.  However, each opposing pair seem to be generally even.  Might this be an issue or is there somewhere else we should look?

We were considering that it may be a gyro or ESC issue.

Thanks in advance for your responses!

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Replies

  • Mike, I’m getting the same problem.

    On the first platform (RTF 940g) after calibrating the 4 ESCs: prop1=3360RPM, prop2=3560RPM, prop3=3420, prop4=3870.

    On the second platform (RTF 883g) after calibrating the 4 ESCs: prop1=3360, prop2=5730, prop3=3300, prop4=4950. After a second ESC calibration: prop1=3360, prop2=5640, prop3=3360, prop4=5280. And finally a third ESC calibration: prop1=3780, prop2=7260, prop3=3270, prop4=5850.


    The motors are: GUEC GM-410 BL Motor 330X-S (400W-1050KV - 3mm shaft) and the ESC are: GUEC GE-010 ESC 10A with Connectors for BL Motor 330X-S. The radio is a Futaba 6EX 2.4GHz Air.


    Should the motors be calibrated?

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