"Artificial intelligence" has undoubtedly attracted more and more attention from people of all walks of life in recent years. Among them, drones are gaining the limelight in the venture capital industry. I have to admit that the emergence of drones has been widely used in forests. Fire prevention, power line patrol, aerial photography and aerial survey, film and television shooting, real estate planning, agricultural anti-spraying, environmental protection, on-site rescue, traffic dredging, transportation and express delivery, etc. However, how to choose the UAV from 4 rotor, 6 rotor, 8 rotor?
The increase in the number of rotors will have a negative impact on the geometry of the aircraft. As the number of rotors increases, the distance between each rotor will naturally decrease. The four-axis aircraft places a rotor every 90 degrees, the six-axis aircraft places a rotor every 60 degrees, and the eight-axis aircraft places a rotor every 45 degrees. Assuming that the total area of the rotor blades of several rotors is the same at the same tension (this is not accurate, but can be used as a rough reference), it is easy to find the rotor diameter required for several structural forms.
The rotor positions of multiple rotors cannot be interfered with each other in design. Therefore, it is easy to find the distance between the rotor center and the geometric center of the aircraft in several structural forms.
It is easy to see that the distance between the center of the rotor and the geometric center of the aircraft increases faster than the diameter of the rotor decreases. Therefore, unfortunately, the greater the number of rotors, the larger the size of the aircraft.
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