This is the Great Planes ElectriFly HT-600 Electric Motor for Airplanes.
FEATURES: For small electric airplanes needing extra muscle for 3D maneuvers
and some R/C cars and boats
Ferrite magnet construction
Wires and leads pre-attached
Case is vented to aid cooling
Flux ring for added performance
INCLUDES: Great Planes ElectriFly HT-600 Electric Motor with pre-installed wires and leads and two capacitors
REQUIRES: Installing in model
SPECS: Length Including Shaft: 2.9" (73.6mm)
Length Not Including Shaft: 2.25" (57mm)
Shaft Shape: Rounded with one flat side
Shaft Diameter: .125" (3.2mm)
Shaft length: .38" (9.6mm)
Case Diameter: 1.5" (37.8mm)
Voltage Range: 7.2V-9.6V
Rotation: Counter-clockwise