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Scorpion HK-4540-400kv (8mm) ULTIMATE

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SKU: HK-4540-400
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  • 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!


Scorpion HK-4540-400kv (8mm) ULTIMATE Specifications
Stator Diameter 45.0 mm (1.77 in)
Stator Thickness 40 mm (1.57 in)
Number of Stator Arms 12
Number of Magnet Poles 10
Motor Wind 5T+5T double Wye (YY)
Motor Wire 1-Strand 1.5mm
Motor Kv Value 400 RPM per Volt
No Load Current (Io) 1.65 Amps @ 10 Volts
Motor Resistance (Rm) per Phase 0.013 Ohms
Maximum Continuous Current 150 Amps
Maximum Continuous Power (18S) 10,000 Watts
Peak Current (3 Seconds) 200 Amps
Peak Power (3 Seconds) 15,000 Watts
Motor Weight 719 grams (25.35 oz.)
Outside Diameter 56.7 mm (2.23 in.)
Shaft Diameter 7.98 mm (0.37 in.)
Motor Body Length 71.9 mm (2.83 in.)
Overall Shaft Length 127.3 mm (5.01 in.)
Max LiPo Cell 12s-18s
Motor Timing 18deg to 24deg
Drive Frequency 8kHz

Weight including packaging: