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New Release !!! HKIV-5035 series !!

Since January 2012 the HKIII-50 series has released, this is one of the best motor for a helicopter in 700 Speed helicopter and 800 class. After 8 years now we are pleased to announce the forth generation of HK-50 motor, HKIV-5035 series motor!!! 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-50 series, with an entirely new EM field design, while improving the compatibility with various speed controllers available on the market. With the new design of the rotor and new configuration, the Scorpion HKIV-5035 series not only provide even higher efficiency but also higher peak power and higher torque with lower running temperature. It is now available right now with three different kV.


  • Stator Diameter 50 mm (1.56 in)
  • Stator Thickness 35 mm (1.38 in)
  • No. of Stator Arms 12
  • Magnet Poles 10
  • Motor Wind 4+3Turn Delta
  • Motor Wire 1-Strand 1.8 mm
  • Motor Kv 500 KV RPM / Volt
  • No-Load Current (Io/10V) 4.2 Amps
  • Motor Resistance (Rm) 0.0108 Ohms
  • Max Continuous Current 120 Amps
  • Max Continuous Power 5328 Watts
  • Weight 785 Grams (27.67 oz)
  • Outside Diameter 62.2 mm (2.45 in)
  • Shaft Diameter 7.98 mm (0.31 in)
  • Body Length 69.2 mm (2.73 in)
  • Overall Shaft Length 124.80 mm (4.91 in)
  • Max Lipo Cell 12s
  • Max Peak Current 160 A (5 seconds)
  • Max Peak Power 7104 Watts (5 seconds)
  • Motor Timing 5deg
  • Drive Frequency 8kHz

Product Link -

The HKIV-4035-520kv motor is ready. A specially built for FAI F3C helicopter use!!!

Since June this year when Scorpion HKIV-40 series was released, a lot of feedback from World Champions and pilots in all facets of the hobby has been received that they have well established the HKIV-40 series as the Gold Standard of R/C model power! The HKIV-4035 series motors have proven themselves to be extremely successful in heli community and has become the most popular motor used in 600 ~ 700 class helicopters worldwide. And now we are pleased to announce the release of the new HKIV-4035-520kv motor that is specially built for F3C helicopter use. With light weight and high torque, it helps you to have a very stable power on your F3C helicopter. This is a F3C Champion Choice and this motor just won the FAI F3C World Champion 2019 !!! It is available right now.


  • Stator Diameter 40 mm (1.57 in)
  • Stator Thickness 35 mm (1.024 in)
  • No. of Stator Arms 12
  • Magnet Poles 10
  • Motor Wind 5+6 2Y
  • Motor Wire 1-Strand 1.35mm
  • Motor Kv 520KV RPM / Volt
  • No-Load Current (IO/10v) 2.1 Amps @ 10v
  • Motor Resistance (RM) 0.016 Ohms
  • Max Continuous Current 84 Amps
  • Max Continuous Power 3729 Watts
  • Weight 456 Grams (16.09 oz)
  • Outside Diameter 49.5 mm (1.95 in)
  • Shaft Diameter 5.98 mm (0.235 in)
  • Body Length 64 mm (2.52 in)
  • Overall Shaft Length 102.4 mm (4.03 in)
  • Max Lipo Cell 12s
  • Peak Continuous Current 104 (5 seconds)
  • Peak Continuous Power 4617 Watts (5 seconds)
  • Motor Timing 5deg
  • Drive Frequency 8kHz

Product Link -

Scorpion Videos

OXY 5 with Scorpion Power

OXY 5 | 560mm | 6S @ 2050rpm (2 min 55 sec)

Kyle Dahl, Brutal flying, EPIC autos, Scorpion Power

Kyle Dahl, Brutal flying, EPIC autos, Scorpion Power (4 min 33 sec)

Last edited by Jim T. Graham; Apr 03, 2020 at 07:56 AM..
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Apr 08, 2020, 08:18 PM
Registered User
doug14's Avatar
I think these motors have the most impressive specs out there.
May 31, 2020, 11:05 AM
Registered User
This spec: "Motor Timing 5deg"... What is that please?
Jun 02, 2020, 10:37 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Motor timing.

Vriendelijke groeten, en wees voorzichtig, Ron
Without a watt-meter you are in the dark ... until something starts to glow
e-flight calculators watt-meters diy motor tips&tricks Cumulus MFC
Last edited by Ron van Sommeren; Jun 02, 2020 at 10:47 AM.

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