The QX-MOTOR ducting set series focuses on the high-tech & research & development of the ducted power systemto produce more efficient & reliable innovative products. This upgraded 50MM EDF 12 leaf design has CW & CCW. With the QF2611 high-performance brushless motor, it is powerful. Efficient. Low temperature. Suitable for modification of ducted machines around 800G. It is the innovative choice of the majority of model friends. Specification: Model: QF2611KV (rpm): 3300KV/4000KV/4600KVConfigu-ration: 9N6 P Shaft diameter: 3.0mm Motor diameter: 25.8mm Weight: 76g No.f cells: 3-4s Lipo Max continuous power: 550w Max continuous current: 45 A Prop Volts (V) Amps (A) Watts (W) Thrust (g) Thrust (oz) Efficiency (g/W) Efficiency (oz/W) Motor model ESC50mm EDF12.632403.278027.511.930.07QF26114600KV40A16.222356.475026.462.100.07QF2611 3300KV40A16.234550.895033.511.720.06QF2611 4000KV40 A Package included:1 x QX-MOTOR 50mm 12 Blades Ducted Fan EDF CW CCW with QF2611 3S 4S Brushless Motor