2nd Generation Heavy duty series for Multi-copter

======= Heavy Duty 2 added features:========
*    complete high voltage solutions, covering a variety of applications
*    optimize KV, apply to aerial photography and plant protection
*    fully-new 9025HD provide single shaft of up to 5000 w output
*    high efficiency, low calorific value, suitable for long running
*    active convection heat dissipation design, internal-integrated 12 centrifugal fan
*    a new rotor design, semi-sealed,water and dust proof (IP34)
*    optimize structure rigidity, more suitable for harsh environment and meet the requirements of high attendance


========HD2 features:==========
   specially designed for high-end multi-rotor and UAV systems
   high-end 28 poles design
   upgraded based on the mature MR/HD technology 
   2nd generation stator, using the best 0.2mm silicon material to improve motor efficiency
   Hollow stator thus to maximum the heat dissipating performance
   Lower IR winding to decrease the temperature remarkably when long-time working
   Imported over-sized ball bearing, lower noise and ultra-long working life 
   short output shaft design
   high-precision rotor, dynamically balanced on both size, lowest resonance in RC industry 
   New stator cover to protect power wires 
   Multiple mounting holes, compatible with DJI frames 
   Lengthen silicon power wire, easy to install 
   Modular stator, easier to maintain 
   Laser-etching model data and factory serial number 
   Comes with propeller adapters, can install traditional and professional propellers
   Recommended to work with Dualsky MRP series propellers to achieve best working efficiency 
   100% inspection in Shanghai Dualsky factory before shipment.