Before Qu Sen and the other two came, the school leaders had told them not to be afraid of spending money. It was best to print more sets of spare parts.
After the three of them heard the price, they discussed for a while. Anyway, they bought the three base materials in full packaging. It would be a waste if they did not use them. They decided to print ten sets of each of the three types of blades and some components that were easy to wear and tear. They were worried that the three models would need to be adjusted in the future, so they printed three sets of each.
After Technician Shao calculated the cost, he quoted a price of forty-eight thousand. This price was already very cheap. It was almost half of the original budget that the three of them had prepared. It was even more incomparable to finding a mold factory to make a mold.
After the price was settled, Technician Shao helped to convert the electronic drawings that the three of them brought into a 3D model and imported it into the printer's control computer. He was worried that the materials would be wasted, so he asked the three of them to check the detailed parameters of the 3D model again.
The three of them were also worried that they would only find out that there were mistakes in the design drawings after they spent the money. They gathered in front of the computer and carefully confirmed the drawings bit by bit.
Needless to say, they did find a problem with the confirmation. After understanding the hardness and toughness of the materials in detail, Li Ying suggested that they could further reduce the thickness of the casing. They only needed to add some extra thickness at the connecting parts.
This way, the weight of the three drones could be reduced a little. The lighter the weight, the more flexibility and endurance could be improved.
Qu Sen and Zhou Li agreed with this idea very much.
If it were a few days ago, they might not have cared much about the improvement of the parameters. However, they now knew that there would be competitors in the selection that they were about to participate in. Moreover, there would be many competitors with strong technical skills.
The three of them thought that students from other schools would be able to think of what they could think of as well. Then, everyone would put the competing products with similar functions together and compete on whose performance parameters were better.
Although adjusting the weight of the casing did not increase the flexibility and endurance of the drone significantly, this small difference in parameters could play a decisive role.
According to the toughness parameters of the material, the thickness of the casing was slightly adjusted. The calculation was not complicated, but there were many things that needed to be changed. After the three of them calculated and worked on it for a while, Technician Shao could not stand it anymore and took over the modification work with a smile.
Qu Sen and the other two could not compare to a professional technician who dealt with electronic drawings. In just over an hour, Technician Shao completed the modification work according to the three people's ideas. Even if Li Ying, who was the most skilled among the three of them, were to do it, it would probably take her at least half a day.
Due to the use of high-density special materials, the printing speed was much slower than expected. After the printer started working, Technician Shao told the three of them that they would have to wait until three o 'clock in the afternoon to finish printing everything.
Qu Sen thought about it and felt that it wasn't good to stay in the equipment room. After discussing with Zhou Li and Li Ying, he decided to go back to the guest house first and come back to pick up the documents when they were all printed.
Because he saw that this seemingly dilapidated unit in front of him had a "universe inside". After the three of them left the design building, they didn't dare to wander around. They went straight back to the guest house and stayed there.
After lunch, they played Dou Dizhu in the room for more than two hours. Suddenly, the phone in the room rang. Technician Shao informed him that the printing of the last set of blades had begun.
The three of them hurriedly put on their coats and trotted out of the guest house. After arriving at the design building, they went through another round of strict verification and inspection before going up to the third floor again.
In the 3D printing room, the three of them were all excited when they saw that the things they had personally drawn on the drawing had turned into a light gray object similar to the plastic material. After confirming with Technician Shao that they could touch it with their hands, they hurriedly held the parts in their hands and looked at them carefully.
The edges and details of the things printed by the 3D printer were very smooth, unlike the things molded by the mold where some small parts still needed to be handled manually.
Technician Yuan had already written down the receipt. After the three of them had seen enough, he told them embarrassedly that if they wanted to take the things away, they needed to pay first.
Zhou Li immediately took out the card that contained the funds allocated by the school and handed it to Qu Sen. After that, he continued to study the blades in his hands.
What could Qu Sen say? After asking about the location of the finance department, he hurriedly went to pay the money. After swiping the card, he put away the receipt and handed the receipt to Technician Shao. After that, he finally got the printed documents.
They had dinner in the small cafeteria. Zhou Li's father was treating them. After dinner, he directly sent the three of them to the train station.
As the time before the start of the selection was very tight, Zhou Li booked the earliest train that would depart at 10: 56 PM.
After more than ten hours of bumpy ride, the three of them finally arrived at the school. Without any rest, they plunged into the operation room. The electric appliance factory had already sent the three models of motors that they needed. Now that the blades had been obtained, a lot of practical testing work was still waiting for the three of them to complete.
As the gyroscope and the matching drive were sent by the School of Wuyi through a secret document, the three models of drones finally entered the assembly stage.
At this time, it was time for Qu Sen to show his skills. Because all three motherboards needed to be welded by him by hand.
Integrating a bunch of purchased or custom-made electronic components into a motherboard was a delicate operation that required a lot of patience.
The welding of the Swift and Qin Nu motherboards went smoothly, but because Nightingale's motherboard was originally very thin and light, coupled with the particularly tight circuit structure, Qu Sen welded two motherboards together and also lost some electronic components.
Because of the tight schedule, Zhou Li and Li Ying wanted to ask Brother Zhao to take over, but Qu Sen stubbornly refused. After having a good meal in the cafeteria on the third floor, they went back to the dormitory to sleep. After waking up, they went back to the operation room and worked for nearly eight hours. Finally, they finished the welding in one go and passed the test.
By the time the control software of the three models of drones was completed, it was already the end of March. There were only ten days left until the official start of the selection on April 7th.
After the three of them showed the results of their work to the school leaders, they began to seize the time to perform functional testing and parameter fine-tuning. After repeated debugging, the Swift was the first to pass the test, but Nightingale's balance had problems. Qin Nu's high-speed camera also had problems capturing images in poor lighting conditions.
Although Nightingale could solve the balance problem by adjusting the power of the individual motors or by adding weight to part of the fuselage, it would inevitably sacrifice flexibility and affect the endurance.
There was no time to redesign the motherboard, so they could only find a solution from the shell. They slightly raised the fuselage to make room for fine-tuning the position of the battery compartment to correct the balance.
Qu Sen took the adjusted design of Nightingale's shell, got on the train overnight, and went straight to Zhou Li's father's unit to print the new components. Zhou Li and Li Ying got on the plane and rushed to the School of Wuyi to further optimize Qin Nu's image processing functions with the engineers there.
Qu Sen's side was faster, mainly because of the delay on the road. After returning to school, they finished the reassembly of Nightingale and began testing. After Nightingale put on the new "clothes", although it was 1.7mm taller than the original design, the stability, silence, and endurance were all perfectly achieved the previous expectations.
Two days later, Zhou Li and Li Ying also came back with Qin Nu. With the help of the engineers in the School of Wuyi, the shutter time and sensitivity of Qin Nu's high-speed camera were optimized again, and the images taken under dim lighting conditions were greatly improved.
At the same time, Zhou Li's room 5 also developed a small plug-in that could automatically mark suspicious targets. Although the recognition was not high, it was still an eye-catching auxiliary function.
On April 4, Qu Sen, Zhou Li, and Li Ying were each in charge of a drone. They demonstrated the operation of the drone for the last time to a group of school leaders and a bunch of professors from various departments in the school. The next day, the three of them stepped on the train to Beijing amidst a lot of encouragement.
After nearly 11 hours of travel, the three of them each carried a suitcase with a drone and left Beijing West Station. They got on the car that came to pick them up and went straight to the equipment testing site of the Equipment Department in the suburbs.
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