At the start the motor rotates normally until the throttle reaches its maximum, then in the mission planner there is a notification that the motor 1 speed is drop Instantly
Here the file log bin
a) mp reported thrust loss
b) throttle motor #3 PWM drop down
c) RPM #3 seems OK
Have you properly tuned the copter step by step according to the guide? I didn’t see the battery data.
After the issue occurred, did the motors feel hot to the touch?
There might be an aerodynamic issue, as there seems to be a lot of throttle variation, if not properly tuned.
Is it actually flying or is this some kind of bench test? If it’s a bench test, forget about it.
That he’s applying full throttle and it’s not going anywhere?
Unrelated to your likely non-issue with thrust loss but you are using the wrong firmware. Check the messages in the log. And you should probbalyt not be using the dev version either. Flash Pixhawk1 (not 1-1M) and Stable (not latest).
And, resolve one post thread before creating another of the same.