Please note that these motors are designed primarily for drones and multi-copters and have "flats" cut into the base of the propshaft to allow suitable propellers to seat securely when operating with either clockwise or counter-clockwise rotation. Motor leads are pre-soldered to connectors. Does not include motor mounting plate! Suitable for 2-3S systems. Technical Specifications: KV: 935kv Length: 39.7mm Diameter: 27.9mm Cells: 2-3S Max thrust: 850g Shaft: 3mm Propeller: 1045 (3S) / 8045(4S) Weight: 55g Recommended ESC: 18A min