Feigao 1208436 12x30mm Brushless Motor,$40, sold by Balsa Products and Aeromicro. Fits GWS IPS gearbox same measurements as GWS IPS brush motor. Needs brushless esc such as CC Phoenix 10 , $60. Go to Balsa Products website for thrust tables by prop, voltage, gear ratio, etc. Somewhat better performance, much better durability than brush motor. Needs 3-cell lipo (11.1 volts) and propped for under 4 amps for best thrust with 8-10 minute duration. comparable to smallest direct drive outrunner motors in power outout .

I have one mounted in a GWS IPS A ratio geardrive. Hope to use it successfully in Guillows and similar scale rubber kit conversions with 7-8" props. There are some threads on this motor on E-Zone.