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Scorpion HKII-2221-8 Brushless Outrunner

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Scorpion HKII-2221-8 Brushless Outrunner


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Scorpion HK Series Brushless Motors are built from the best materials available, and are designed to provide both quality and performance at an affordable price. Scorpion starts with high quality aluminum alloy parts that are produced on the latest CNC milling machines. These parts are then gold anodized to provide a beautiful, long-lasting finish. The stators are made with 0.2mm laminations to give maximum efficiency, and minimum Eddy current losses. The stators are epoxy coated to prevent shorts, and are wound with wire that is rated at 180 degrees C (356 F). The magnets used in Scorpion Motors are rated for operation at 200 degrees C (392 F), making a motor that is virtually impossible to burn up in normal use.

All Scorpion HK Series 22mm motors come with 3.5mm male Bullet style connectors already attached, and include a hardware package that contains 3 matching female Bullet connectors for your speed controller, heatshrink to cover the bullet connectors and mounting screws. Since the HK series motors are primarily designed for Helicopter and Ducted Fan use, they do not include a prop adapter. If you intend on running a prop on this motor, you will need to purchase a prop adapter for a 3.17mm shaft (1/8 inch).

Stator Diameter: 22.0 mm (0.87 in)
Stator Thickness: 21.0 mm (0.83 in)
No. of Stator Arms: 9
Magnet Poles: 6
Motor Wind: 8 Turn Delta
Motor Wire: 16-Strand 0.21mm
Motor Kv: 3595 RPM / Volt
No-Load Current (Io): 2.31 Amps @ 10 volts
Motor Resistance (Rm): 0.024 Ohms
Max Continuous Current: 45 Amps
Max Continuous Power: 475 Watts
Weight: 81 Grams (2.86 oz)
Outside Diameter: 27.9 mm (1.098 in)
Shaft Diameter: 3.17 mm (0.125 in)
Body Length: 38.3 mm (1.508 in)
Overall Shaft Length: 58.7 mm (2.311 in)
Max Lipo Cell: 3s
Motor Timing: 5deg
Drive Frequency: 8kHz

  • Kv(rpm/v) 3595.00
  • Max Current (Motor) (A) 45.00
  • Resistance (mh) 24.00
  • Max Voltage (V) 11.00
  • Power (W) 475.00
  • Shaft A(mm) 3.17
  • Length B (mm) 40.00
  • Can Diameter C(mm) 28.00
  • Can Length D(mm) 25.00
  • Total Length E(mm) 58.00

Dimension Diagram Guide

  • attributeset-10


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JESUS DAVID | Verified Buyer

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Customer Rated

Mar 17, 2012

Hace ya 4 meses que lo tengo, es una maravilla, va muy bien, con un pion de 14T a 3400rpm, para 3d, y normal 3000rpm

javipons22 | Verified Buyer

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Certified Buyer Rated

Nov 16, 2011

Packaged very nicely in a can , came with 3 stickers, 3 different sizes of the scorpion logo , the motor must perform very well, the best for a rave 450 and 350mm 3s config !

motorhead | Verified Buyer

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Certified Buyer Rated

Oct 11, 2011

I ONLY used the Scorpion 2221-8 motor on ALL my 450-sized helis! It gives me the best power with a decent flight time. I used this motor with a 13T pinion and I get no bogging with 3D stunts. Just make sure to use decent lipo batts that delivers at least 25C of power rating. I recommend the Rhino 2250 30C for best results!

Greg | Verified Buyer

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Customer Rated

Jul 04, 2011

This is one the the best motors out there for the 450 class helicopter. It has plenty of power for even the most demanding pilots and comes down barely warm after 5 mins. of hard core 3d. Match this up with a 13 or 14 tooth pinion and you can't go wrong. Simply the best out there.

samste | Verified Buyer

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Customer Rated

Jun 30, 2011

This Motor is Aw some and it will be very hard to burn this one out.

i have been using this on Skyfun Funjet with a 3s motor and 6x4 prop max approx 70 amps on full throttle for ages and never gets hot.

I also run this on 4s with a 5x5 prop for extreme speeds and approx 70 amps.

i always used a turning plush 80 esc for the setup and still got my first scorpion motor i bout two years ago and still goes strong.

I just hope they stock spare shafts, bearings clips etc for them as the shaft will be the only thing you probably ever need to change on them if you bend them.

Well done Hobbyking From a very Happy Scorpion Addict

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