Weak power after ESC calibration

Fellow APM:ers, I need help win an issue I can't get my head around.

I fly a tricopter, APM2.5 with arducopter 3.1.5, Tiger MT 3506, 4S LiPo, 10*4.5 props, AFRO-Esc's with default software. I have been flying this since spring and it's been working great, great power and stability.

The other day I noticed the one of the motors could not keep up with the others at full throttle, it tilted somewhat during ascent. 

ESC Calibration was my first thought, so I calibrated the ESC's with the all-at-once method.

Now the Tri is crippled, it just about lifts off at full throttle (Before it hovers fine at 1/3 throttle).

I have tried everything. Calibrated the ESC's one at the time connected to the receiver. Changed the LiPo, propellers, checked all connections. 

Please help me!

 

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Replies

  • 3D Robotics

    First, do a RC calibration again. 

    Second, check that these THR values have not deviated from the defaults:

    3701788089?profile=original

    • Thanks for the reply.

      I forgot to mention I also did radio calibration. And when nothing helped I did a factory-reset on the APM followd by re-flashing version 3.1.5, and the whole set-up procedure.

      I checked the THR_ params and they are as in your picture.

      Check my logs, It seems I'm at full throttle al the time..

      3702506223?profile=original

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