Custom built quadcopter on Firer 130 frame. Seems something is not right with gyro which is drifting to back and left even when quad is on table and transmitter is off. Because of that artificial horizon is in 15-20 degrees even when quad is leveled straight.
UPDATE: Drift cause was faulty gyro chip in flight controller.
Eachine Firer 130 frame
DYS BE1104 7000KV motors – https://goo.gl/A3UadQ
Eachine Minicube 10A BLHeli_S 4-in-1 ESC – https://goo.gl/ZNNbKc
Micro 20x20mm Betaflight Omnibus F4 FC – https://goo.gl/3ikSKV
RotorX 2535B propellers – https://goo.gl/HnpvJo
Battery is TATTU 3S 450 mAh 75/150C.