I have a friend that build a quad around an APM2.5 board, in the past I had also one and I liked it, but now the firmware has changed and I couldn’t find the option where I selected the motor power (there ware tree options as I remember).
We did radio calibration and everything looks ok in Mission Planer, also did ESC calibration, each ESC at a time while connecting the ESC to port 3 of his receiver. All the esc beeped correctly confirming throttle calibration.
When he tries to take off the throttle is not increasing motor rpm, the motos seemed to remain at idle speed, maybe just a slight variation, when he tries to move the AIL, ELE stick the motors start spinning much faster, and it leans the quad in correct direction, but the motors spin faster only when he moves all the other sticks except throttle. In mission planner if he moves the throttle sticks the green bar increases correctly, from the bottom to the top. The quad also arms correctly.
Don;t know what the problem might be, any help is appreciated.
The quad configuration is
NTM Prop Drive Series 28-26 1100kv
Multicopter SimonK Speed Controller ESC HVSK-40A (OPTO) (he had those from another bigger octocopter)
4S 6000mah Nanotech lipo
Frame : a copy of DJI Flame Wheel F450