Specifications
Stator Diameter................22.0 mm
Stator Thickness...............21.0 mm
No. of Stator Arms.............9 Pole
No. of Magnet Poles..........12 Pole
Motor Kv..........................4250KV-RPM / Volt
No-Load Current (Io).........3.5 Amps
Max Continuous Current....40 Amps
Max Continuous Power......580 Watts
Weight............................80 g
Outside Diameter.............28 mm
Shaft Diameter.................3.17 mm.
Body Length.....................N/A mm
Overall Shaft Length..........N/A mm
Max Trust.........................900 g. 
Propeller...........................4.1."x4.1" (Lipo 3 Cell with Pinion 11-12T) 
Helicoptor..........................450 Class.