Designed to be a direct swap out for your 25 size glow engine. This brushless outrunner will provide more power and with its high efficiency, long run times.
A quality motor, built specifically for planes designed to fly with a 25 size glow engine.

Spec.
Battery: 3~4 Cell /11.1~14.8V

RPM: 870kv

Max current: 32A

No load current: 10V/2.4A

Current capacity: 44A/15sec

Internal resistance: 0.03 ohm
Weight: 193g  (not including connectors)
Diameter of shaft: 5mm
Dimensions: 78x35mm

Required; 

50A ESC
3S~4S Li-Po / 10 ~ 14-cell Ni-MH/Ni-Cd
11x8 ~ 14x7 prop
Suitable for sport and scale airplanes weighing 3 to 5.5 pounds (1.4?.5kg).