From 2010 when Scorpion HKIII-40 series is released, a lot of feedback by World Champions and pilots in all facets of the hobby are received that they have well established themselves as the Gold Standard of R/C model power!
The HKIII-4025 series motors have proven themselves to be extremely successful in heli community and has become the most popular motor used in 500~600 class helicopters world-wide.
And now we are pleased to announce the release of the fourth generation HKIV-4025 series motors. With the same motor design and materials of HKII-45 series, and single strand winding technique on this size of motor, it has the better efficiency and power conversion than HKIII-40 series, with an entirely new EM field design, while improving the compatibility with various speed controllers available on the market. This new design motor will deliver even more power to your helicopter, with increased efficiency!
Stator Diameter 40 mm
Stator Thickness 25 mm
No. of Stator Arms 12
Magnet Poles 10
Motor Wind 6+7 Turn Delta
Motor Wire 1-Strand 1.2 mm
Motor Kv 520KV RPM/Volt
No-Load Current (IO/10v)1.81 Amps
Motor Resistance (RM) 0.022 Ohms
Max Continuous Current 65 Amp
Max Continuous Power 2886 Watt
Weight 347 Grams (10.58 oz)
Outside Diameter 49.50 mm (1.95 in)
Shaft Diameter 5.98 mm (0.24 in)
Body Length 54 mm (2.13 in)
Overall Shaft Length 84.6 mm (3.33 in)
Max Lipo Cell 12s
Peak Continuous Current 90 Amps (5 seconds)
Peak Continuous Power 3996 Watts (5 seconds)
Motor Timing 5deg
Drive Frequency 8kHz