# PX4 1.12.3: Diverging Motor RPM on new Quad

**URL:** <https://discuss.px4.io/t/px4-1-12-3-diverging-motor-rpm-on-new-quad/27681>\
**Category:** PX4 Autopilot\
**Created:** [May 30, 2022, 4:53pm UTC](https://discuss.px4.io/t/px4-1-12-3-diverging-motor-rpm-on-new-quad/27681 "2022-05-30T16:53:32Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![mcraven](https://discuss.px4.io/user_avatar/discuss.px4.io/mcraven/32/10797_2.png) [@mcraven](https://discuss.px4.io/u/mcraven)\
**Post date:** [May 30, 2022, 4:53pm UTC](https://discuss.px4.io/t/px4-1-12-3-diverging-motor-rpm-on-new-quad/27681/1 "2022-05-30T16:53:32Z")

</div>

Trying again… no replies

> [@Uneven motor RPM: NXP Hovergames New Build](https://discuss.px4.io/t/uneven-motor-rpm-nxp-hovergames-new-build/27657):
>
> Quadcopter using NXP Hovergames kit. I’ve updated all the firmware and loaded the latest stable PX4. Radio is fine and I believe I’ve calibrated everything correctly. When I arm and try to lift off, one (or two) motor are slowing significantly relative to the rest and I abort because the vehicle is just going to tilt and flip. The setup and calibration has been done in QGC (including ESC calibration) I’ve downloaded the log and loaded into online analyzer. I can see the throttle input and the …

I’ve been investigating via MAVLink Inspector and my radio channels are calibrated and centered (RC\_CHANNELS) and the MANUAL\_CONTROL moves from 0 to 1000 for throttle and -1000 to 0 to 1000 on stick movements.

Before I arm, SERVO\_OUTPUT\_RAW is reported as 900 on all motors and, when I arm and have throttle at 0, this jumps to 1075. When I begin to throttle up, all motors seem to move up in sync but quickly begin to diverge. Essentially, one of the motors has been throttled all the way back to ~1075.

This is a new build and I’m new to PX4 and QGC. That said, I’ve followed the setup carefully and I’m pretty sure the IMU and GPS are reporting “reasonable” numbers. Help please???

 ![image](https://discuss.px4.io/uploads/default/original/2X/2/2f4a7e9907ad798910f41c49140723142039f1fc.png)

 ![image](https://discuss.px4.io/uploads/default/original/2X/a/aea6362fc043bf6eddd80c80e352e4901d756eea.png)