This is the .15 OMA-3815-1000 Brushless Electric Motor from O.S. Motors. FEATURES: For .15 size airplanes Stainless steel prop shaft Rigid rear mounting design Two year limited warranty through Hobby Services beginning at date of purchase INCLUDES: .15 Brushless Electric Motor with Backplate Propeller Adapter 3.5mm Gold Plated Male Plugs attached to leads Three 3.5mm Female Plugs with Shrink Wrap Instruction Sheet REQUIRES: 50 - 70A brushless ESC Slow flyer type electric propeller from 9x6 to 12x6 in size depending on specific aircraft SPECS: Rated Voltage: 11.1 Rated Current: 35A Maximum Current (5 sec): 60A No Load Current: 1.1A Phase Resistance: 36.5 miliohms Maximum Efficiency: 85% kV: 1000 Turns: 16 Poles: 14 Shaft Diameter: 0.16" (5mm) Shaft Length: 0.46" (11.7mm) Weight: 4.6oz (130g) Lead Wire Length: 1.96" (50mm) Lead Wire Gauge: 17AWG Length of Motor Can: 1.5" (37.8mm) Diameter of Motor Can: 1.45" (37mm) Prop Washer Diameter: 0.78" (20mm) 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 01/11/12 ir/jxs