Scorpion HK-4525-520KV - ULTIMATE [hk_4525_520_ult]
The Scorpion HK-45 series motor* is designed for using on 700 class helicopters running on 12-cell Li-Po power. This motor represents the most technologically advanced power source ever offered for a 700 class electric helicopter and also produces 20% more torque than the Scorpion popular HK4035 series motors and exceed 89% efficiency. This new 4525 Ultimate has a new flux design, it has a lower internal resistance and a higher efficiency. The continues power rating are the same as the 4525LE but it has a higher peak rating.
Each of the new HK-4525-520KV ULTIMATE motor is wound with a single strand of 1.4mm wire for the highest possible efficiency. This motor is capable of running continuously at an input power of 4450 watts at 100 amps, and can handle peak inputs of 10200 watts and 230 amps for 2 seconds
Scorpion Competition 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 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 custom manufactured to be able to withstand high temperatures, making a motor that is virtually impossible to burn up in normal use.
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.
For the best overall combination of quality, performance, and value, use Scorpion Motors in your helicopter!
*This motor is using 30mm bolt spacing on the mounting with M4 Screw holes
HK Patent No. : HK1141674
China Patent No. : ZL2010 2 0298704.9
Taiwan Patent No. : M399539
German Utility Patent No. : 202012006207.7
U.S Patent No. : Pending
All Others Worldwide Patent : Pending
No. of Stator Arms
No. of Stator Poles
No-Load Current (Io/10V)
Motor Resistance (Rm)
Max Continuous Current
Max Continuous Power
Overall Shaft Length
Max Lipo Cell
|45 mm (1.77 in)
25 mm (0.98 in)
1-Stand 1.4 mm
520 RPM / Volt
487 Grams (17.17 oz)
56.7 mm (2.23 in)
5.98 mm (0.24 in)
53.4 mm (2.10 in)
91.5 mm (3.60 in))
230A (2 seconds)
10200 Watts (2 seconds)
Included in the Box
1 x Scorpion HK-4525-520KV
* Gold connectors are not soldered nor included
Weight including packaging
Weight including packaging
View Scorpion HK-4525-520KV-ULTIMATE Full Dimension
* Please note that photographs may not accurately represent the number of items per package, size, color or features of a product.