- Model: HOBBYMATE HB2835-H Brushless Motor- KV: 3800RPM/V- Rotor Diameter: 3.17mm- Efficiency: >90%- Maximum current: 37A- Battery cells: 3S- Perfect for 450 RC helicopters                                                                                                                                Dimensions: 1.97 in x 1.1 in x 1.1 in<br />Weight: 3.28 oz