Turnigy LB- Brushless Motor (420w) Specifications: Dimension: 37mm x 27mm Weight: 88g (108g with all fittings, connectors & prop driver) Kv: rpm/V Voltage: 11.1v (3s) Max Power: 420w Max Current: 40.1A No load Current: 1.8A Diameter of shaft: 4mm Thrust: g ESC: 50A~60A