Tempest 4120-420Kv Brushless Motor

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Tempest Motors are designed to provide the optimum blend of Performance, Reliability and Affordability.  These motors produce impressive power with rugged durability at a price that makes them one of the best values available in RC Power Systems.

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For many years modelers had to choose from two ends of the power system spectrum:  Cheap motors made with inferior quality components or top-quality motors, made from the best materials, but with a price tag that was out of reach for many pilots.  The Tempest line of Brushless Motors provides the best of both worlds, giving high power output at an affordable price that will not break the bank!

Unlike most other motors available today, that provide virtually no performance information, Tempest motors include full Performance Data charts. These charts use actual testing data, from a motor testing dyno, measured at multiple input voltages using dozens of different propellers, so you know exactly what performance to expect for your model.

Also available for every Tempest motor is a full range of replacement parts including Prop Adapters, Cross Mounts, Shaft Kits and Bearing Sets.


Included with every Tempest 41mm series motor is a complete accessory kit that includes the following items:

  • Aluminum Cross Mount with mounting screws
  • Threaded Prop Adapter with mounting screws
  • Machined Aluminum Prop Washer
  • Standard Hex Prop Nut
  • Machined Aluminum Spinner Cone Prop Nut
  • A set of 3 Female Bullet connectors to match the ones already installed on the motor
  • A set of 3 pieces of black Heat-Shrink Tubing
  • Hex wrenches to fit the crossmount and prop adapter screws

CLICK HERE for the Performance Data Chart


Tempest 4120-420Kv Specifications
Stator Diameter 41.0 mm (1.614 in)
Stator Thickness 20.0 mm (0.787 in)
Number of Stator Slots 12
Number of Magnet Poles 14
Motor Wind 20 Turn Delta
Motor Kv Value 420 RPM per Volt
No Load Current (Io) 1.44 Amps @ 10 Volts
Motor Resistance (Rm) per Phase 0.057 Ohms
Motor Resistance (Rm) Phase to Phase 0.038 Ohms
Maximum Continuous Current 48 Amps
Max Continuous Power (4-cell Li-Po) 710 Watts
Max Continuous Power (5-cell Li-Po) 890 Watts
Max Continuous Power (6-cell Li-Po) 1070 Watts
Max Continuous Power (8-cell Li-Po) 1420 Watts
Motor Weight 273 grams (9.63 oz.)
Outside Diameter 49.8 mm (1.961 in.)
Shaft Diameter 6.00 mm (0.236 in.)
Motor Body Length 42.9 mm (1.689 in.)
Overall Shaft Length 70 mm (2.756 in.)
Motor Timing 5-10 degrees or Auto
PWM Frequency 8-16 KHz




CLICK HERE to Download the CAD STEP file of the bare Tempest 4120 motor




CLICK HERE to Download the CAD STEP file of the Tempest 4120 motor with the Prop Adapter and Cross Mount attached


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