The KMS Quantum 2814/09 O/R Brushless Motor can be used in "500" to "600" planes and .25-size glow conversions, 3D planes up to about 40 oz, and sport planes up to about 70 oz.

Specs:

Nearest AXI Equivalent: 2814/20
Diameter: 35 mm
Length: 36 mm
Stator Size: 28 x 14 mm
NiCd/NiMH cells: 7-12
LiPo Cells: 2-4
IO Amps: 1.1
Turns: 9
KV/RPM: 830
Max Cont Current: 20a
Max Current: 25a/60s
Max Efficiency: 77%
Resistance: 87 mohm
Shaft Dia: 4 mm
Weight: 103 g
Bearings: 2
Poles: 14
ESC Timing Degrees: 20-30 (High)