HJ550 is a series of "Firewheel" Multicopter frame from HJ. It is very suitable for RC beginner althougn HJ550 have simple design, with built-in circuit board for ESC power distribution, seldom parts but strong structure to let user more easier for maintenance. The mounting holes design can fit for different controller board e.g. KK, FF, MK, MWC in the RC market, it can fulfill different kind of user need e.g. FPV.
Please note that the thickness of the 4 motor arms are 5mm, pls use M3x8 screw for motor fixing.
Recommanded Combination: Motor: A2212/2216/2814 800KV~1000KV ESC: 20A ~ 30A Propeller Size: 10x4.5 in or 10x4.7 in Battery: 4s 2000mah ~ 3600mah Lipo