# PX4 quad drone "Motor Position Coordinate System"

Source: https://forum.modalai.com/topic/4715/px4-quad-drone-motor-position-coordinate-system
Category: General Questions (https://forum.modalai.com/category/2/general-questions)
Posted: 2025-08-29 18:14:08 UTC by johnwhear
Replies: 0 · Views: 783

## johnwhear · 2025-08-29 18:14:08 UTC

I want to understand PX4 "Motor Position Coordinate System" before I purchase a ready to fly development drone.

I want to be able to move the Center of Mass and update the "Motor Position Coordinate System".

Can I do this with PX4 and "Motor Position Coordinate System"? Do I understand this correctly?

![quadcopter_actuators_cg_reference.DOcDEHY9.png](https://forum.modalai.com/assets/uploads/files/1756491123484-quadcopter_actuators_cg_reference.docdehy9.png)