HobbyStar 4120 (5055) Brushless Outrunner Motor



HobbyStar brushless outrunner motors are built using high-quality components and precision balanced to ensure a smooth, reliable and powerful motor for your aircraft. Motor shafts can be reversed on all motors, and a hardware kit with mounting plate, prop adapter and hardware kit are included with all motors.


  • 14-pole, 12-slot high-torque design
  • CNC machined 6061 T6 billet aluminum housing
  • High-purity copper windings for maximum efficiency
  • High RPM ABEC 5 oversized bearings
  • Precision balanced rotor 
  • Super-thin stator laminations (0.2mm)
  • Flexible silicone leads with pre-installed gold-plated connectors


      Specifications for all variants:

      KV (RPM/Volt) Watts Cells Max Amps Rotor Poles IO Resistance Motor Size Stator Size Weight Propeller Shaft Diameter (mm) Connectors
      435 1450 4-6S 58A 14 1.0A 0.0362 50x55mm 4120 285g 16*8/16*10/17*9 6mm 4.0mm
      570 1550 4-6S 65A 14 1.5A 0.0255 50x55mm 4120 285g 14*8/15*8/17*9 6mm 4.0mm
      760 1650 4-5S 83A 14 2.4A 0.0173 50x55mm 4120 285g 14*8/15*8/17*9 6mm 4.0mm

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