This is the .05 OMA-3805-1200 Brushless Electric Motor from O.S. Motors.

FEATURES: For .05 size airplanes
          Stainless steel prop shaft
          Rigid rear mounting design
          Two year limited warranty through Hobby Services beginning at date of
            purchase

INCLUDES: .05 Brushless Electric Motor with Backplate,
            3.5mm Gold Plated Male Plugs attached to leads,
            Three 3.5mm Female Plugs with Shrink Wrap, and
            Instruction Sheet

REQUIRES: 20 - 40A Brushless ESC
          Slow flyer type electric propeller from 9x6 to 11x7 in size
            depending on specific aircraft

SPECS:    Rated Power: 250W
          Rated Voltage: 11.1mm
          Rated Current: 20A
          Maximum Current (5 sec): 30A
          No Load Current: 1.1A
          Phase Resistance: 65.1 miliohms
          Maximum Efficiency: 80%
          kV: 1200
          Turns: 22
          Poles: 14
          Shaft Diameter: 0.16" (4mm)
          Shaft Length: 0.46" (11.7mm)
          Weight: 2.7oz (76g)
          Lead Wire Length: 1.96" (50mm)
          Lead Wire Gauge: 17AWG
          Length of Motor Can: 1.1" (27.5mm)
          Diameter of Motor Can: 1.45" (37mm)
          Prop Washer Diameter: 0.75" (19mm)
          Thickness of Motor Mount: 0.118" (3mm)
          Width of Motor Mount: 1.96" (50mm)
          Height of Motor Mount: 1.96" (50mm)

COMMENTS: Nomenclature is defined as follows:
            0MA means 0.S. airplane motor
            First two digits are the rotor diameter
            Second two digits are the length of the magnets
            Last digits indicate the kV of the motor

                                                                   jxs 11/14/12
                                                                         ir/jxs