1. Environmental issues
(1) The plot is small. Most plant protection drones operate between 3 and 8 acres, and the frequency of takeoff and landing is too high. Not every piece is connected together. The number of transitions increases, the roads in the field are difficult to move, and the aircraft is too heavy. Too many facilities, which greatly reduce the efficiency of the work, so when you take the order, you must first ask the local farmland situation before making a decision.
(2) There are many tree lines. The field is surrounded by a large number of trees, and the flight risk factor increases. The high-voltage line can be seen everywhere, which has a great influence on the electronic magnetic compass of the aircraft, which increases the instability of the aircraft. Therefore, it is necessary to avoid trees and high-voltage lines.
(3) There are many people. Farmers are curious about airplanes. Every time they go to a new place to fight drugs, they will always cause onlookers. In fact, this is a particularly dangerous phenomenon. Whether taking off or landing has a great impact and pressure on the flying hand, so when the medicine is used, the field is 20m. Unrelated personnel are prohibited from entering the area to ensure a good spraying environment.
2. Flight skills
(1) Flight height. According to the spray effect of the aircraft, it is recommended that the flight height of the aircraft is 1-2.5m. If the flight is too low, not only the small range of the spray can affect the operation efficiency, but also the low flight is likely to be poured into the frying machine. The flight is too high, the effect of spraying the wine is not good, the peasants complain of the sound, the appropriate spray height, and benefit others.
(2) Flight speed. In principle, the faster the flight speed and the higher the efficiency, the higher the safety and the effect of the spray. However, in the actual spraying process, it is found that for the 10kg model, the weight of the fuselage plus the battery and the medicament can reach 25kg, and the inertia is large. If the flight is too fast, it is difficult to control the flight attitude of the aircraft according to his own idea. Stopping difficulties and other phenomena, increasing the accident rate of the aircraft (may also be different types of flight control, different stopping methods), but in general, it is recommended that the flying speed of the 10kg model is 5m/s.
(3) Visual error. When the plant protection drone is flying too far, the human eye can no longer judge the distance between the aircraft and other objects. Whether it is front or rear or left and right, visual errors are easily generated during the operation. This requires the ground crew to give the flying hand the correct signal indication according to their own judgment. Of course, it is also possible to make a breakthrough in technology, so that the aircraft can automatically judge the timing of the stop and make corresponding actions. Although there is already a technology for planning the route to fly automatically, it is not suitable for the farmland with complicated environment.
3. Staffing
Through this fight, for plant protection drones, each aircraft must have at least three people: flying hands, signal hands, ground handling. If there are only two people, the signal hand can't run back and add medicine to change the battery, so these work have fallen on the flying hand, wasting a lot of time, the flying hand should only be responsible for taking off and landing and fighting drugs, can not let other problems The rhythm of the spray. Therefore, reasonable staff allocation can also greatly improve the efficiency of the operation.
4. Pre-flight inspection
Every time you use the plant protection drone to fight drugs, you must do a safety check before taking off, check whether the motor is loose, whether the paddle is balanced, whether the GPS position is correct, whether the installation is firm, the battery power must be enough, and the remote control should have sufficient power. Satellite signals must meet the minimum standards for takeoff. A good security check is responsible for the safety of the aircraft and the person.
5. Emergency handling
(1) The plane suddenly lost control. For the sudden loss of control of the aircraft, many flying hands will be overwhelmed by the tension, which will make the situation worse. I warn everyone here that in this situation, you need to stay calm, even if you can't keep calm, remember: quickly change the flight mode to manual, because this will break the connection between the aircraft and GPS, if there is a problem with the GPS module. This is undoubtedly the most appropriate. After the mode is switched, the control of the aircraft can be quickly obtained. At this time, do not rush to land the aircraft. First increase the throttle, raise the aircraft to correct the attitude of the aircraft in the air, and find a suitable landing site. , slowly fall until safe landing.
(2) The fuselage is abnormal. If the aircraft's own hardware is abnormal, such as the motor suddenly stops working, it is necessary to test the technology and experience of the flying hand. In short, try to stabilize the flight attitude of the aircraft (for an eight-axis aircraft, a motor stall can be controlled) Slowly land, if it really can't be controlled, then follow the principle of a non-injuring machine and an imminent death.
There are many kinds of unexpected problems in the plant protection operation process, but remember to keep calm, believe in your own judgment, usually do a lot of practice, learn more flight knowledge and summarize the flight of seniors. Experience, in order to become a qualified flying hand, you must personally invest in field plant protection operations.
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