In today's turbulent economic market, the stock market is unstable, and the hearts of 99% of the investors are cool; the real estate is in the doldrums, and the big ones have jumped, fled, and transformed. They blindly joined the Internet or the Internet. The laymen, how much money is like sand and sea, did not even arouse a little ripple; national leaders are emphasizing the supply side reform of agriculture every day, unified management of agricultural planting, and actively improving productivity, but China’s agricultural area is 1.8 billion. When is this modern agriculture completed? "Artificial Intelligence" has undoubtedly received more and more attention from people from all walks of life in recent years. Among them, drone merchants have taken the limelight in the venture capital industry, earned enough funds, and also sizzled the current market. I have to admit that the emergence of drones has indeed been widely used, and it is not only optimized, but also refined and intelligent. Forest fire prevention, power inspection, aerial aerial survey, film and television shooting, real estate planning, agricultural flying spray, environmental protection, on-site rescue, traffic guidance, delivery and so on. This market has brought opportunities for young people to start a business. Therefore, the various communities, forums, news, and WeChat public numbers about drones are also hotly discussed. For drones, there are four rotors, six rotors, and eight. The rotor model, have you been blind?
It is the balance of aircraft stability, geometry and single-engine performance.
The effect of stability is basically, we can think of the stability of a multi-rotor aircraft, eight rotors > six rotors > four rotors. The reason of course explains that for an aircraft with a certain motion characteristic, the more it is naturally able to participate in the control, the easier it is to get a good control effect. The quadrotor is still an underactuated system. The six-rotor aircraft was already a fully-driven system. It's one thing to be complicated, but it's worth it if you get better results. Another benefit that is not easy to notice is that the aircraft's tolerance to powertrain failures increases as the number of rotors increases. After all, it is not uncommon for a multi-engine aircraft to suddenly fail. Model-level aircraft, shooting is also a common thing. In this case, both the eight-rotor and the six-rotor can withstand dual-shot/single-shot failure and the aircraft is still controllable. In the case of a four-rotor aircraft, as long as the single-shot fails, unless there is a periodic variable pitch on the rotor, the only option is to crash.
The increase in the number of geometric-sized rotors can have a negative impact on the geometry of the aircraft. Because the number of rotors is large, the distance between each rotor is naturally reduced. The quadcopter placed a rotor every 90 degrees. The six-axis aircraft placed a rotor every 60 degrees, and the eight-axis aircraft placed a rotor every 45 degrees. Assuming that the total area of ​​the blades of several rotors is the same at the same pull (this is not accurate, but can be used as a rough reference), it is easy to derive the rotor diameters required for several structural forms.
Similarly, the rotor positions of the multi-rotor cannot be interfered with each other when designed. It is therefore also easy to derive the geometric center distance of the rotor center from the aircraft in several configurations.
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 reduction in rotor diameter. So unfortunately, the more the number of rotors, the larger the size of the aircraft will be.
Some people may say: Is there a multi-rotor aircraft that is stacked up and down? Is it a set of coaxial anti-paddle power groups placed on one arm at the same time, so that the number of rotors can be increased without increasing the size of the aircraft? This idea looks good. However, an important disadvantage is that the airflow of the pair of rotors of the coaxial anti-paddle will interfere with each other, thereby affecting the efficiency of the pair of power combinations. Simply put, the pull of the pair of rotors is not 1+1 = 2, but a bad result of 1+1 < 2 . As for the specific loss, it is about 20%. Therefore, in this case, the improvement that this configuration can achieve is limited, and the complexity of the structure is increased.
Take the road of science and technology to promote agriculture, and help the countryside to get rich!
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What determines the number of rotors? Exterior? Flight speed?
It is the balance of aircraft stability, geometry and single-engine performance.
The increase in the number of geometric-sized rotors can have a negative impact on the geometry of the aircraft. Because the number of rotors is large, the distance between each rotor is naturally reduced. The quadcopter placed a rotor every 90 degrees. The six-axis aircraft placed a rotor every 60 degrees, and the eight-axis aircraft placed a rotor every 45 degrees. Assuming that the total area of ​​the blades of several rotors is the same at the same pull (this is not accurate, but can be used as a rough reference), it is easy to derive the rotor diameters required for several structural forms.
Similarly, the rotor positions of the multi-rotor cannot be interfered with each other when designed. It is therefore also easy to derive the geometric center distance of the rotor center from the aircraft in several configurations.
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 reduction in rotor diameter. So unfortunately, the more the number of rotors, the larger the size of the aircraft will be.
Some people may say: Is there a multi-rotor aircraft that is stacked up and down? Is it a set of coaxial anti-paddle power groups placed on one arm at the same time, so that the number of rotors can be increased without increasing the size of the aircraft? This idea looks good. However, an important disadvantage is that the airflow of the pair of rotors of the coaxial anti-paddle will interfere with each other, thereby affecting the efficiency of the pair of power combinations. Simply put, the pull of the pair of rotors is not 1+1 = 2, but a bad result of 1+1 < 2 . As for the specific loss, it is about 20%. Therefore, in this case, the improvement that this configuration can achieve is limited, and the complexity of the structure is increased.
Take the road of science and technology to promote agriculture, and help the countryside to get rich!
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