This is the .25 Brushless Electric Motor from O.S. Motors.

FEATURES: For .20 - .25 size airplanes
          Stainless steel prop shaft
          Rigid rear mounting design
          Centrifugal fan design with angled ventilation holes draws air
            through the motor and across the windings and magnets for improved
            cooling
          Two year limitedd warranty through Hobby Services beginning at date
            of purchase

INCLUDES: .25 Brushless Electric Motor with Backplate, four Phillips Head
            Mounting Screws, 3mm Gold Plated Male Plugs attached to leads,
            three 3mm Female Plugs with Shrink Wrap, Prop Adapter and
            Instruction Sheet

REQUIRES: 60A brushless ESC

SPECS:    Rated Voltage: 11.1
          Rated Current: 40A
          Maximum Current (10 sec): 80A
          No Load Current: 1.7A
          Phase Resistance: 26.7 miliohms
          Maximum Efficiency: 80%
          kV: 960
          Turns: 12
          Poles: 14
          Shaft Diameter: 0.20" (5mm)
          Shaft Length: 0.45" (11.5mm)
          Weight: 5.64oz (160g)
          Lead Wire Length: 3.5" (90mm)
          Lead Wire Gauge: 17AWG
          Length of Motor Can: 1.7" (43.3mm)
          Diameter of Motor Can: 1.47" (37.5mm)
          Length/rear of Motor Can to Prop Washer: 2.3" (58mm)
          Prop Washer Diameter: 0.87" (22mm)
          Thickness of Motor Mount: 0.12" (3mm)
          Width of Motor Mount: 1.96" (50mm)
          Height of Motor Mount: 1.96" (50mm)

          Performance for this motor with different props and LiPo cells is as
            follows (all data with 60A ESC):
          Prop Size   Current      LiPo Cells  Wattage   Thrust   RPM
          11x5.5E       31A           3S        391W      1.9kg  10,100
          11x7E         37A           3S        466W      2.1kg   9,750
          11x8.5E       44A           3S        554W      2.1kg   9,350
          11x10E        49A           3S        617W      2.0kg   9,100
          11x4.7SF      44A           3S        554W      2.2kg   9,400
          11x7SF        59A           3S        743W      2.7kg   8,540
          12x6E         40A           3S        504W      2.4kg   9,650
          12x6SF        66A           3S        832W      2.4kg   8,280
          12x8E         49A           3S        617W      2.5kg   9,170
          12x10E        66A           3S        832W      2.0kg   8,050
          13x6.5E       50A           3S        630W      2.8kg   9,040
          13x8E         56A           3S        706W      2.9kg   8,730
          13x10E        65A           3S        819W      2.7kg   8,120
          14x7E         61A           3S        769W      3.1kg   8,520
          14x10E        75A           3S        945W      2.9kg   7,600

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 10/31/12
                                                                         ir/jxs