Scorpion HKII-4525-520 Ultimate Brushless Motor (55mm Shaft)

The Scorpion HKII 4525-520 Ultimate Edition Brushless Motor is the second iteration of the incredibly popular and world renown HK 4525-520 Ultimate Edition Motor. Elevating the performance and improving an already proven design was no easy task, and has taken Scorpion 7 years of additional testing and development to make the leap forward in performance, efficiency, durability, and ultimately increased compatibility!

Meet the HKII 4525-520 Ultimate Edition Burhsless Motor. By refining, improving, and selecting different materials for manufacturing, Scorpion has increased the efficiency and power conversion thanks to an entirely new electro-magnetic (EM) field design, and additionally improve compatibility with all speed controllers on the market! Improved power output, longer flight times, lower heat, are all aspects of the new HKII motor that provide a superior choice over the previous 4525-520 Ultimate Motor. 

HKII 4525-520 features a 1.4mm single strand wire within it’s windings, which provides the highest efficiency possible. Thanks to improvements in craftsmanship, this motor can operate at a continous input power of 4450 watts at 100 amps, and handle peak inputs of 10200 watts at 230 amps for two 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 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.

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 Scorpion 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!

*NOTE: This motor uses 30mm bolt spacing for mounting, with M4 Screw holes.

Specifications:
Stator Diameter: 45mm (1.77″)
Stator Thickness: 25mm (0.98″)
No. of Stator Arms: 12
No. of Stator Poles: 10
Motor Wind: 5+6T YY 
Motor Wire: 1-Strand 1.4 mm
Motor Kv: 520KV RPM/Volt
No-Load Current (Io/10V): 1.81 Amps
Motor Resistance (RM): 0.012 Ohms
Max Continuous Current: 100 Amps
Max Continuous Power: 4450 Watts
Weight: 516 Grams (18.20 oz)
Outside Diameter: 56.9mm (2.23″)
Shaft Diameter: 5.98mm (0.24″)
Body Length: 57.5mm (2.27″)
Shaft Length: 55mm Exposed (2.16″)
Max Lipo Cell: 12s
Max Peak Current: 230A (2 seconds)
Max Peak Power: 10200 Watts (2 seconds)
Motor Timing: 5 deg to 15 deg
Drive Frequency: 8kHz

This product was added to our catalog on August 23, 2017