According to foreign media new atlas, many people don’t like to deliver drones to their homes. Their propellers may spin dangerously. Rds1 is designed with this in mind, because UAVs can drop packages from high altitude, but they won’t land. < / P > < p > rds1 (rapid delivery system 1) was created by A2Z dragon delivery, a Los Angeles based company. It combines a remote-controlled DJI matrix 600 Pro six wing UAV equipped with a Kevlar rope with an electric reel. At the end of the rope is an elastic fabric bag that can hold payloads up to 2 kg (4.4 lb). < / P > < p > when the UAV reaches its destination, it will hover at an altitude of 150 feet (46 meters). It then releases the brake on the tethered reel, allowing the payload bag to fall freely in the air. However, shortly before the payload bag reaches the ground, the reel brake is gently re applied, slowing the downward speed of the payload to a stop. < / P > < p > this function is realized by the lidar (light detection and ranging) sensor on the UAV, which can accurately measure the distance between the aircraft and the ground. < / P > < p > after the customer retrieved the package, the now empty bag was rolled back into the helicopter. If necessary, customers can also put their own packages in bags for delivery to another address. Then, the drone continues on its way. < / P > < p > the purpose of the system is not only to protect customers from the noise and potential dangers of low altitude hovering UAVs, but also to avoid the need for UAVs to maneuver on obstacles such as branches and wires, thus wasting time and battery power. Rds1’s free fall assembly is also designed to save time and power. Compared with the motor that uses a reel to slowly lower the payload to the receiver’s setting, the rds1 free fall assembly is designed to save time and power. The iPhone 12 keynote has been recorded in Apple park