Sandkastle
New Member
I am building my first real quad, and I started with a $112 package from EBay which included an imitation F450, a KK2.1.5 flight controller, four 30A generic simonk ESCs, and a set of SunnySky x2212 980kv motors.
After lots of research online I got it put together with the correct motor placement and rotation. On my first test flight though it immediately flipped over.
Upon closer inspection, I found that the motors sped up correctly for control directions, but were behaving incorrectly for compensating based on the accelerometer and auto level settings. It would speed up the motor on the high side, which explains the unstable control situation. The board was placed correctly, with the buttons toward the back, and motor 1 on the left front and motor 2 on the right front, 3 on the right rear, and 4 on the left rear.
Since there is no way to reverse the sensor input on the KK2.1.5 board, I had to reverse the motor wires (by switching motors 1-3 and 2-4, effectively rotating the flight controller 180 degrees) and reverse the transmitter signals for the aileron and elevator channels vs what should have been right and what the board indicated was correct.
I flew it for the first time tonight successfully, so my plan worked. I couldn't find anyone else who had a similar solution to a not quite right imported KK board, so I thought I would post my experience.
The moral of the story is to be sure to check how the board compensates before attaching the props. The sensors aren't always as they should be.
After lots of research online I got it put together with the correct motor placement and rotation. On my first test flight though it immediately flipped over.
Upon closer inspection, I found that the motors sped up correctly for control directions, but were behaving incorrectly for compensating based on the accelerometer and auto level settings. It would speed up the motor on the high side, which explains the unstable control situation. The board was placed correctly, with the buttons toward the back, and motor 1 on the left front and motor 2 on the right front, 3 on the right rear, and 4 on the left rear.
Since there is no way to reverse the sensor input on the KK2.1.5 board, I had to reverse the motor wires (by switching motors 1-3 and 2-4, effectively rotating the flight controller 180 degrees) and reverse the transmitter signals for the aileron and elevator channels vs what should have been right and what the board indicated was correct.
I flew it for the first time tonight successfully, so my plan worked. I couldn't find anyone else who had a similar solution to a not quite right imported KK board, so I thought I would post my experience.
The moral of the story is to be sure to check how the board compensates before attaching the props. The sensors aren't always as they should be.
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