This listing (Ebay: https://www.ebay.com/itm/T-Motor-M690-Quadcopter-Drone-60-Min-Time-for-DJI-Pixhawk-Ardupilot-etc/193901327648) is for a lightly used T-Motor M690 Quadcopter Drone. These currently sell new for $1800. It was previously used for long-endurance mapping using a custom Pixhawk autopilot and carrying a Sony a6000 camera. Note, there are holes that were drilled into the top plate of the airframe body and top cover to mount the previous electronics. Additionally, a mount for a removable Drotek RM3100 compass mast (great compass by the way) was adhered to the top red cover. Neither modifications affect functionality, and the original mounting threads for DJI, Pixhawk, and Micropilot flight controllers are untouched.
This drone includes a CNC machined aluminum airframe body with power board, carbon fiber motor arms with integrated motors, ESCs, and nav lights. It has foldable landing gear, a carbon fiber red top cover, payload mounting threads, GPS mast, and compass mast (for the RM3100).
This drone is capable of flying for 1 hour with a 1kg payload. It normally uses a ~30AH 4S smart battery made by Tattu, but I believe that you can also used a normal LiPo 4S battery (with an XT60 plug) that fits into the battery bay. The smart batteries can be purchased from T-Motor’s website or a number a T-Motor distributers. I am unable to include any batteries due to shipping restrictions unless you do a local pickup.
This will help if someone may share the stable PID gains for this bird. I own two of them and struggling to make it stable. Even after multiple autotunes. It flies well in low wind conditions but very unstable when its windy. It would help if someone has tested gains for this frame. I normally fly with all up weight of 4.1 Kg.
Do you use 4S battery system with Kv500 motor or 6S battery system?? To my knowledge, TDrone have two power system: 4S and 6S battery system… I suspect that the 6S is better than the 4S system…