Scorpion HKII-2221-8 V2 Brushless Motor (475W, 3595Kv)

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Scorpion HKII-2221-8 V2 Brushless Motor (475W, 3595Kv)
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This is the Scorpion V2 Series HKII-2221-8 V2 brushless motor. Improvements include better cooling with the integrated centrifugal blower fan, higher efficiency with a new stator design and a new threaded-on flux ring for more solid construction.

This is a great motor for the 450 size helicopter class, such as the T-Rex 450, Blade 400, Thunder Tiger Mini Titan E325 and more. Remember to determine the correct KV rating for your helicopter, based on the number of cells you use in your battery, and the gear ratio you have in your heli.

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 N-50EH style, which 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 and a cross style backplate mount with 4 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 3.175mm shaft (1/8 inch).

Scorpion Motors are built to last, and are backed with a 2-Year warranty against defects in materials or workmanship. For the best overall combination of quality, performance, and value, give Scorpion Motors a try!

Note: This motor uses a 3.17mm bore pinion gear sold separately.

Stator Diameter: 22.0 mm (0.866 in)
Stator Thickness: 21.0 mm (0.827 in)
No. of Stator Arms: 9
No. of Magnet Poles: 6
Motor Wind: 8 Turn Delta
Motor Wire: 16-Strand 0.21mm (31 AWG)
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 (2.86oz)
Outside Diameter: 27.9 mm (1.097 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:
Drive Frequency: 8kHz

This product was added to our catalog on February 29, 2008

Douglas McGinnis
Verified Owner
Tuesday, Jun 1 2021 (about 2 years ago)
Scorpion HKII-2221-8 V2 Brushless Motor (475W, 3595Kv)
Bought this Scorpion to upgrade my Blade 450X. Way stronger than the stock 440 motor and just as smooth as silk. Vibration went away and it is like a different heli, highly recommend the 2221-8.
Melvin W. Quinene
Verified Owner
Friday, Dec 18 2020 (about 3 years ago)
Scorpion HKII-2221-8 V2 Brushless Motor (475W, 3595Kv)
This item is excellent,it'll do a better job then the stock motor, it feels and looks very durable thank you !