Brushless cut off at full throttle

If you have got the problem that your DC brushless motor cut`s off at (nearly) full throttle with a terrifying noise, you will find the solution for your problem here.

The root cause for the reaction between the ESC (Electronic Speed Controller) and the electric brushless motor at high rpm is, that the timing of the ESC does not match the needed timing of the motor.

Below you will find some examples.

The Hacker A20-8XL EVO with a RPM/Volt (kv) 1500 needs a timing of 20°-25° and the

Hacker A20-6XL 10 Pole EVO with RPM/Volt (kv) 2500 needs a timing of 15° - 20°.

The timing has to be programmed / set up in the ESC.

The needed timing for the motor is influenced by the parameters of the motor like the RPM/Volt (kv) and the amount of poles of the copper coils inside of the motor.

In general there are some easy rules:

#1 The higher the number of the angle of the motor datasheet, the higher the ESC timing must be set.

#2 In best case use the data sheets of the ESC and the brushless motor and set it up like it should be

# 3 In the case that you have got no detailed data of your motor (most cheap motors) try the following steps.

-          Start with a low timing setting on your ESC and turn the throttle stick of your remote control, quick to full throttle with a mounted prop (BE CARFULL BECAUSE THE MOTOR CREATS THRUST. Make sure that your motor/plane/copter is fixed really save, pointing to a direction away from you.  Remember that a prop or motor can rip off in worst case.)

-          If it works and the motor runs perfect è Be happy and go fly

-          If it does not work and the motor makes crazy noises select the next faster / higher setting for the timing of your ESC. Repeat this steps until the motor runs perfect.  Even when hard speeding up from 0 rpm/min to full throttle.

There are some more ways to handle that problem:

#A) Mount a propeller with same diameter and less pitch. or

#B) mount a propeller with smaller diameter and same pitch 

In both cases you will lose some (static) thrust but the motor is able to turn a bit faster and the timing behavior of the motor will change a bit. Maybe the change is enough to match with the settings of your ESC.

In general I personally would recommend to run the ESC with a lower timing, because the efficiency is of the ESC is higher and you will get less heat load on the ESC. That means: Only take the fastest timing you really need and not more.

To change the timing of the ESC you need the instruction of the ESC or a programming card for your kind of ESC.