OMA-5025-375 .50 Brushless Electric Motor from O.S. Motors.
Features:
    * For airplanes using .50 size 2-stroke engines or .91 size 4-stroke engines
    * 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

Specifications:
    * Rated Power: 1550W
    * Rated Voltage: 25.9 - 29.6V
    * Rated Current: 50 - 60A
    * Maximum Current (10 sec): 90A
    * No Load Current: 2.0A
    * Phase Resistance: 27.5 miliohms
    * Maximum Efficiency: 85%
    * kV: 375
    * Poles: 14
    * Shaft Diameter: 0.23" (6mm)
    * Shaft Length: 0.45" (11.5mm)
    * Weight: 14.3oz (405g)
    * Lead Wire Length: 4.3" (110mm)
    * Length of Motor Can: 2.3" (57.5mm)
    * Diameter of Motor Can: 1.98" (50mm)
    * Length/rear of Motor Can to Prop Washer: 2.9" (74mm)
    * Prop Washer Diameter: 1.06" (27mm)
    * Thickness of Motor Mount: 0.16" (4mm)
    * Width of Motor Mount: 2.67" (68mm)
    * Height of Motor Mount: 2.67" (68mm)

Performance for this motor with different props and LiPo cells is as follows (all data with 100A ESC):
Prop Size  ESC  Max Elec. Current  LiPo Cells
14 x 8  100A  45A  8S
14 x 10  100A  56A  8S
15 x 8E  100A  50A  8S
15 x 8E  100A  38A  7S
16 x 8E  100A  62A  8S
16 x 8E  100A  47A  7S
15 x 10E  100A  60A  8S
15 x 10E  100A  47A  7S
16 x 10E  100A  57A  7S
16 x 10E  100A  43A  6S

Includes:
.50 Brushless Electric Motor with Backplate, four Phillips Head
Mounting Screws, 4mm Gold Plated Male Plugs attached to leads,
three 4mm Female Plugs with Shrink Wrap, Prop Adapter and
Instruction Sheet