It is very important that you set the throttle calibration range of your ESC’s BEFORE attempting to fly.
The most full proof way is to do each one individually, follow the ESC manufacturers guide.
Generally they are set using the following procedure
1- connect esc to motor
2-connect esc to reciever
3-push transmitter throttle to full, and switch on transmitter
4-connect battery to esc
5- after a couple of seconds the motor will beep a couple of times , as soon as you hear this, reduce the throttle on the transmitter to minimum
6- the motor will emit several more beeps (confirming throttle range set, and checking lipo cell number)
7- all done, now repeat the above for the rest of your ESC’s
