Feigao motors with gearbox need to have the pinion and all fasteners Loc-Tite'd prior to use. When you get it, take it down and perform this procedure. Gearbox easily unthreads from adapter plate. Use thread locker on pinion to motor shaft, pinion set screw, adapter plate screws and a very small amount on gearbox mounting threads. Use blue only.
Feigao 13084 Series Long Brushless Motor with planetary gearbox. Ratio 4:1. 20mm x 40mm case. 2.3mm x 10mm shaft. Weight = 80g/2.8oz. Choose # windings below (21,23,25 or 27). Motor constants listed with choice.
Feigao 38084 Series Short Brushless Motor direct drive or mount in your own gearbox. 27.6mm x 48mm case. 3.17mm x 10.5mm shaft. Weight = 135g/4.8oz. Choose # windings below. Motor constants listed with choice.
Feigao 38084 Series Long Brushless Motor. 37.6mm x 58mm case. 3.17mm x 10.5mm shaft. Weight = 170g/6.0oz. Choose # windings below (9 or 17). Motor constants listed with choice.
 "Feigao 13084 Series Long Brushless 20mm Motor-Geared")
 "Feigao 38084 Series Short Brushless 28mm Motor Direct - LAST ONE LEFT!")
 "Feigao 38084 Series Long Brushless 28mm Motor")
