SF250 FAQ

1. Calibrated the motors but the no1 does not spin costantly..I have to put throttle to 50% or more and it starts..but when i go down to 10-20% it stops

Does the same happen to the rest three motors? If just the No.1 motor did not spin at low throttle, you can debug it as follows.

1) It may be idle speed (RPM) not being set. You can set the value like this:

The output calibration means setting the neutral rate for the motor. Follow the steps below: Step 1: Connect the battery to the aircraft. Step 2: Press the Start button below and slide the slider to the right until the motor starts to spin. Step 3: click Stop. When the motor stops, press Start again to see whether the motor can start itself. Slide the sliders to the left or right to set the critical point of the motor to spin. Step 4: Please pay attention to the rotation direction of the motor. Ensure the motors are spinning in the correct direction as shown in the diagram. Swap any two wires of a motor to change the direction. Since the output calibration of the Motor 2, 3 and 4 is the same as the Motor 1, just set their neutral rate in the same way as setting the Motor 1. Note: Pay attention NOT TO make the motor spin too slowly because it will give out much heat at the critical point, which may damage the motor.

2) Possibly the throttle travel is not set of the ESC. Refer to the following steps to set the travel of the ESC connected to the No.1 motor.

Test Operations (power-on): 1. Ensure the receiver is in PWM mode. About shifting the receiver’s mode, please follow the instructions.

2. Connect the signal wire of the ESC to the pin 3 of the receiver, i.e., the yellow wire to pin S, red one to +, and black one to -.

3. Power on the radio transmitter → pull throttle to max → power on ESCs → detects a max throttle signal → beep twice, indicating the max throttle is set and saved → pull throttle to min within 2 seconds → a long beep indicates the min throttle signal is detected → check the battery’s voltage, beep three times, indicating the cells quantity of battery → hear the notes “♪ 1 2 3”, indicating it’s ready → pull up the throttle to start → pull up a little to see whether the motor spins or not.

4. Repeat the operations above to configure the rest motors and ESCs. Check the Test Video here: https://www.youtube.com/watch?v=3aV-8cS6D_I