• AXI 2826/12
  2600 5S
  APC 13 x 5.5 EP
  Medium (25) Gain
  PWR set to Outrunner
  Low (0) timing
  10'095 RPM set
  9'870 RPM in flight logged

I am experiencing screeching sound when flying tight corners.

Thank you for suggestions on what to do

rgds. Peter Germann

Thank you, Christoph,

I forgot to mention this:
When running the motor at flight RPM without prop and flipping the airplane very quick up 90° there is no screeching.
Doing the same with my std. APC 13 x 5.5 EP prop produces the screeching effect.

As whenever the screeching occurs current goes up significantly, I suspect that gyro force in a hard turn exites bell to temporarily resonate, making the motor momentarily loosing commulation.  From this, I wonder whether settings for timing, gain and/or PWW rate could be of influence on the suspected loss of commulation.

I can exclude spinner touching front ring and bell colliding with inside of fuse nose. And bearings, as the motor is new.

Peter

ps. from the loudness of this particular noise, we must have pretty big fleas down here

I wonder why such a low timing? Recommended timing for axi 2826 is 20-25 deg. I use 15 deg on mine as per Igor's advice.


Vitalis

Is this motor rear or front mounted? Longer bell motors have a lot of flex when rear mounted. Frequently enough that the bell can deflect letting the magnets hit the stator. I ruined a couple smaller outrunners because of this. It may also screech when this happens.


Matt

Interesting, I had a screech on spool up with my Ice Lite 75, Eflite 32 and Hubin timer.  It didn't seem to matter which prop and the spinner clearance was fine.  I changed bearings and even installed a new motor, still the screech.  After switching to Igor's active system the noise went away.  It remained a mystery and I have moved on.