SCORPION HKII-4525-520KV ULTIMATE 6 / 55mm

Scorpion HKII-4525-520 KV - ULTIMATE

The new HKII-4525-520KV ULTIMATE brushless motor is wound with a single strand of 1.4mm wire for the highest possible efficiency.
This latest generation motor is capable of running continuously with an input power of 4450 watts at 100 amps and handles peak currents of 10200 watts and 230 amps (max. 2 sec.).

With the HKII-4525-520kV Ultimate we have once again raised the bar and redefined power for 700cc helicopters!


Technical data:
Stator Diameter: 45 mm (1.77 in)
Stator Thickness: 25 mm (0.98 in)
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: 526 Grams (18.55oz)
Outside Diameter: 56.9 mm (2.24 in)
Shaft Diameter: 5.98 mm (0.24 in)
Body Length: 57.7 mm (2.27 in)
Overall Shaft Length: 112 mm (4.41 in)
Max Lipo Cell: 12s
Max Peak Current: 230A (2 seconds)
Max Peak Power: 10200 Watts (2 seconds)
Motor Timing: 5deg to 15 deg
Drive Frequency: 8khz


The popular Scorpion HK-4525-520kV Limited Edition motor has been available since September 2010. The HK-4525 is the reference in terms of performance for helicopters in the 700 class.
In April 2012, eighteen months later, Scorpion introduces the improved HK-4525 Ultimate Edition to the public. This engine is one of the most popular
engines in 700cc helicopter competitions worldwide.
Many other manufacturers have tried to match the engine, but no one has succeeded. Even Scorpion tried to improve the engine and failed for a long time.

Now, 5 years later, we are proud to present the HKII-4525-520kV Ultimate.

• Through improvements to the materials and motor design, we have managed to improve the efficiency and energy conversion of the current into rotary motion.
• The HKII offers a completely redesigned EM field design while maintaining its high compatibility with all controllers on the market.
• This new motor has more power reserves with higher efficiency for your helicopter.