I finally tried that loop outside of the simulator, but failed miserably. A silly and unnecessary mistake: I should have been at least twice as high before attempting a loop.

Well, lesson learnt. Next time I won't fail. Well, at least not for the same reason anyway...

Equipment:
- Frame: DJI F550
- Gyro: DJI Naza v2 with GPS
- Gimbal: DJI Zenmuse H3-2D
- Camera: GoPro Hero3, Black Edition
- Radio: Futaba T14SG with receiver R7008SB
- Battery: Li-Po 4S (14.8V), 6200 mAh
- Motors: Stock F550 (DJI 2212/920)
- Esc: Stock F550 (DJI ESC 30 amps OPTO)
- Propellers: Stock DJI 10"