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Scorpion 4020-1320KV Brushless Motor V4 (HKIV-4020-1320KV) - Goblin 500

Scorpion 4020-1320KV Brushless Motor V4 (HKIV-4020-1320KV) - Goblin 500

Regular price $229.00 USD
Regular price Sale price $229.00 USD
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From 2010 when Scorpion HKIII-40 series is released, a lot of feedback by World Champions and pilots in all facets of the hobby are received that they have well established themselves as the Gold Standard of R/C model power!

The HKIII-4020 series motors have proven themselves to be extremely successful in heli community, and has become the most popular motor used in 400~500 class helicopters world-wide.

And now we are pleased to announce the release of the forth generation HKIV-4020 series motors. With the same motor design and materials of HKII-45 series, and single strand winding technique on this size of motor, it has the better efficiency and power conversion than HKIII-40 series, with an entirely new EM field design, while improving the compatibility with various speed controllers available on the market. This new design motor will deliver even more power to your helicopter, with increased efficiency!

Scorpion HKIV-4020-1320KV

Stator Diameter

40 mm (1.57 in)

Stator Thickness

20 mm (0.79 in)

No. of Stator Arms


Magnet Poles


Motor Wind

3+4 Turn Delta

Motor Wire

1-Strand 1.7mm

Motor Kv

1320KV RPM/Volt

No-Load Current (IO/10v)

5.74 Amps

Motor Resistance (RM)

0.006 Ohms

Max Continuous Current

90 Amps

Max Continuous Power

1998 Watts


310 Grams (10.94 oz)

Outside Diameter

49.50 mm (1.95 in)

Shaft Diameter

4.98 mm (0.20 in)

Body Length

49.2 mm (1.94 in)

Overall Shaft Length

80 mm (3.15 in)

Max Lipo Cell


Peak Continuous Current

105 Amps (5 seconds)

Peak Continuous Power

2331 Watts (5 seconds)

Motor Timing


Drive Frequency


Included in the Box

  • 1 x Scorpion HKIV-4020-1320KV Motor
  • 3 x Female Connectors
  • 3 x Connector Cover
  • 4 x M3 Screws

Weight including packaging

  • 679g