Feature: 1. The main barrel is made of aluminum alloy, high strength and is not easy to deform, avoid scratching the inner wall of the main barrel by the blades. 2. A rectifier with a larger horn diameter to meet the needs of FRP model aircraft products, fit for most ducted model 105mm RC plane on the market. 3. There is only a 0.5mm seam between the blade and the main cylinder wall, and the efficiency of the duct is high. 4. The blade is made of carbon fiber mixed materials, high strength and toughness, not easy to deform or break, pure sound when rotating at high speed. 5. The motor mounting seat has a certain degree of heat dissipation, and the installation is not easy to be offset, so as to avoid the axle deviation and cause damage or fly accidents. 6. Separate blades, each piece of weight error accuracy is small, and the motor can ensure high‑efficiency operation without resonance. 7. Separate blades are assembled with high precise and free symmetrical, convenient and flexible during dynamic balance testing of blades, quick pairing, and high test passing efficiency. Specification: Item Type: RC Ducted Fan Material: Aluminum Alloy+Plastic+Copper Color: Black+Silver Size: Approx. 105mm/4.1in Weight: Approx. 1316.0g/46.4oz Number of Paddle: 11Pcs Fan Blade Type: Vortex Blade Type Motor Model: 4270 750KV (External Rotation) Suggested Battery: 6Sx2,5200mAh 60C(not include） Suggested ESC: 160A Plug Model: For Banana 6.0 Motor: Motor Shaft: Approx. 8mm/0.3in Motor Shaft Length: Approx. 17mm/0.7in Installation Hole Distance: Approx. 25mm/1.0in Installation Aperture: M4 Test: Test battery: 12S, 5200mAh, 60C, Lithium Battery Test Current: 118A Maximum Thrust: 7.4kg Suitable for 105mm RC Plane 1. The measurement data is all measured in the actual use environment of the laboratory (a fully-charged lithium battery), and may be different from other power measurement standard data. 2. The balance test has been carried out before shipment . Package List: 1 x RC Ducted Fan1 x Manual Note: 1. Minors are not allowed to use this, or must be used under adult supervision2. Understand and abide by the terms of safe operation3. For safety reasons, do not face the air inlet or outlet of yourself or others4. When using or testing this product, please resolutely place it firmly in the model or other support equipment, and it is forbidden to carry out the power‑on test by hand5. When using or testing this product, please do not touch or approach the rotating parts and keep it away from the working fan to avoid serious injury.6. When using or testing this product, please do not allow foreign objects to enter the fan, so as not to damage the product or cause injury to the jury7. This product is only used for modern aircraft or industrial purposes, please do not use it in household appliances or other daily activities.8. Please install and use the product according to the instructions, and do not change the voltage or any other parts in the product.9. This product has passed the "dynamic balance test" when installing the motor, please do not disassemble, repair, or modify by yourself to avoid slowing down the speed.10. Manual measurement, please allow 1‑3mm/0.04‑0.12in error, thank you.11. Due to the difference between different monitors, the picture may not reflect the actual color of the item.