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Scorpion HKIII-4035-500, 6mm Shaft
Scorpion HKIII-4035-500, 6mm Shaft

Scorpion HKIII-4035-500, 6mm Shaft

Price: $269.95
In Stock
Part Number:HKIII-4035-500KV
The Scorpion HKIII-4035 motors represent the most technologically advanced power system ever developed for use in 700-Class electric helicopters. These motors are designed to provide all the power that you can use, while still maintaining excellent efficiency and cool running characteristics. The HKIII-4035-500 motor features a new patented rotor can that provides several benefits. First, it is thicker for more stability at higher speeds, and this also helps to retain more of the magnetic field for higher efficiency. Second, the outer surface of the rotor can features a new spiral rib pattern that increases surface area and helps to move air around the motor for increased cooling and lower operating temperatures.

There are several changes in the new HKIII-4035 Series motors that were made in response to requests from customers over the past couple years. These changes include:

1. Longer shaft to allow for the use of additional support bearings on the other side of the pinion gear.
2. A flat area pre-cut into the shaft for the set-screw on your pinion gear.
3. Larger 4mm threaded mounting holes for more secure mounting.
4. Dual mounting hole pattern with both 25mm and 30mm hole spacings.

In addition to the mechanical changes to these motors, changes in metalurgy in the stator assembly and rotor can have increased the overall efficiency. This allows the motor to handle higher currents while developing more torque and more power that will allow your 700-Class helicopter to perform like never before.

Scorpion HKIII 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 Electro-Coated 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 all hand-wound to insure the highest copper fill rate with wire that is rated at 180 degrees C (356 F), and high voltage tested to insure that no shorts are present. The high temperature magnets used in Scorpion Motors are designed to give top performance in the most demanding applications.

All Scorpion HKIII-4035 series motors come with 4mm male Bullet style connectors already attached, and include a hardware package that contains 3 matching female Bullet connectors for your speed controller with matching heat shrink tubing. For maximum strength, the Scorpion HKIII-4035 series motors feature an 8mm motor shaft that is ground down to a 6mm diameter at the output end to fit standard size pinion gears. Since the HKIII Series motors are primarily designed for Helicopter 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 6mm shaft.

Scorpion Motors are built to last, and are backed with a 2-Year warranty against defects in materials or workmanship. However, due to the high RPM of these motors, and the fact that we cannot control the installation and setup, the bearings are not covered by the 2-Year warranty, nor is any subsequent damage caused to the motor by a bearing failure. Bearings are a normal wear item, and as such, need to be maintained and changed periodically. For maximum life, make sure that a sufficient gap is left between the pinion and main gear during motor installation to avoid binding, and put a small drop of oil on each bearing every 5-6 flights. It is the responsibility of the pilot to ensure that the bearings are maintained properly.


Scorpion HKIII-4035-500 Motor Specifications
Stator Diameter40.0 mm (1.575 in)
Stator Thickness35 mm (1.024 in)
Number of Stator Slots12
Number of Magnet Poles10
Motor Wind9 Turn Delta
Motor Wire21-Strand 0.29mm
Motor Kv Value500 RPM per Volt
No Load Current (Io)2.02 Amps @ 10 Volts
Motor Resistance (Rm) per Phase0.016 Ohms
Maximum Continuous Current84 Amps
Max Continuous Power (8-cell Li-Po)3500 Watts
Motor Weight460 grams (16.22 oz.)
Outside Diameter49.98 mm (1.97 in.)
Shaft Diameter5.98 mm (0.24 in.)
Motor Body Length61.8 mm (2.43 in.)
Overall Shaft Length100.0 mm (3.93 in.)
Max LiPo Cell12s
Peak Current104 Amps (5 seconds)
Peak Continuous Power4600 Watts (5 seconds)
Motor Timing5deg
Drive Frequency8kHz

Weight including packaging


Warning - Cancer & Reproductive Harm -
This product may contain chemicals that are known in the state of California to cause harm.

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