Ducted fan high-altitude tethered fire-fighting UAVs(Unmanned Aerial Vehicle system)

① Strong fire-fighting capability: The payload ranges from 200 to 400kg, and the continuous flow rate of liquid (either water or Class B foam) sprayed at a height of 100m can reach up to 20L/s. Its fire-fighting capability is comparable to the traditional ladder type fire truck. Compared to existing rotary-wing fire drones, it can increase the continuous fire-fighting liquid flow rate by more than ten times without increasing the overall size of the aircraft, and the effective spray distance is increased by four times. ② High rescue efficiency: With a total length of less than 10 meters, the vehicle can arrive at the fire scene promptly alongside the fire rescue team upon receiving the alarm, enabling initial firefighting within 15 minutes. ③ High safety: Multiple redundancies ensure no secondary harm on-site.