RC 50mm Electric Ducted Fan 12 Blades Ducted Fan With Brushless Motor For RC Specification: Product name: 50mmEDF + motor control board Operating voltage: can use 4S 5S model airplane battery Scope of application: Violent fan accessories Product power supply actual measurement data: (3300KV) (1) 21V 35A thrust 1180G (2) 18.5V 28A thrust 980G Safety Configuration: QF2611-3300KV+1000W--can be equipped with 21V, 4.5AH (industrial battery) QF2611-4000KV+1000W--Can be equipped with 16V, 4.5AH (model airplane battery) QF2611-5000KV+1000W--Available with 12V, 4.5AH (model airplane battery) Package includes: 1*50mmEDF 1*motor control board Note: 1.The control board connection wires to the motor end need to be soldered on your own! 2.Do not remove the culvert flares! It will affect the thrust! 3. By choosing to use this product, you indicate that you are aware of and comply with the terms of safe operation. Otherwise, stop using this product. 4. For safety, do not point the air inlet or outlet toward yourself or others. 5. This product should be installed and used under the parameter settings instructed by the manufacturer, and should not be altered in voltage, overloaded or otherwise modified. 6. This product has been “dynamic balancing” debugging at the factory. Please do not disassemble it by yourself. Modification, or affect the balance of the product 7. When the product dynamic balance debugging. The inner wall of the pipe will have a little scratch city, can not accept the person please do not buy.