This is the Great Planes ElectriFly RimFire 400
28-30-950 Brushless Outrunner Electric Motor.

FEATURES
For Sport airplanes up to 32oz (905g) and 3D airplanes up to 20oz
(565g)
Designed for explosive acceleration and maximum torque
Lightened aluminum can houses high torque rare earth Neodymium
magnets
Double shielded bearings
Better cooling means 50% more power than many others Outrunners of
similar size
Virtually maintenance-free; no commutators or brushes to wear out
Two year quality guarantee
INCLUDES
Great Planes ElectriFly RimFire 400 28-30-950 Brushless Outrunner
Electric Motor with leads and 2mm male bullet connectors, motor
mount and prop adapter
REQUIREMENTS
Speed control for Brushless Motors such as the ElectriFly
Silver Series 25 (GPMM1820)

SPECIFICATIONS
Motor Diameter: 1.1" (28mm)
Motor Length: .87" (30mm)
Shaft Diameter: 3mm
Shaft Length: .47" (12mm)
kV Rating: 950 rpm/V
Weight: 1.91oz (54g)
Input Voltage: 7.4-11.1V (2-3S LiPo)
Max. Constant Current: 14A
Max Surge Current: 20A
Max Constant Watts: 155W
Burst Watts: 220
No Load Current: .7A
Suggested Prop Sizes: 8x6 - 10x4 slow fly