The assembly bell has sounded, and 10 minutes later, everyone has moved the plane to the designated place, and everyone has made the final preparations before the flight.

The experts of the judging group went to the scene to see their planes, and they walked in front of Cao Yan, a military industry of Kazakhstan, Hong Tiejun of the National Defense Science and Technology University, and Huang Fuxing of the Chinese Academy of Sciences. In unison, they said "Yes, tilt angle quadcopter vertical take-off and landing, not bad!" Not bad! Not bad!"

The expert group said that three in a row were good.

When the expert group arrived at Li Tangshan and took a look in front of them, an old expert said: "Young man, you still have to work harder. Li Tangshan and Xie Shiliu also used composite fixed-wing vertical take-off and landing without technical content. The only benefit is that the technology is mature and stable.

"Let's start the game," said the expert group leader. The field worker calls the tower.

Airplane: Tower, Dong Wu called.

Tower: Please

Airplanes: Ready, ready to race, what are the weather conditions.

Broadcast: Dong Lu (06) broadcast called

Tower: Donggui (07) Tower, please speak

Broadcast: 20 km southwest of the field, there is a moderately weak convective cloud, moving eastward, mainly bringing light rain, with an average wind speed of 5 m/s and gusts of 15 m/s. Broadcast over!

Tower: Understood

Tower: Dong Gui (07) tower called

Airplane: Please

Tower: Clearance complete

Airplane: Understood

Tower: Ready to slide out

Airplane: Understood

Airplane: Tower, Dong Wu called.

Tower: Please

Airplane: Ready, ready to slide out

Tower: Can slide out

Hurry up and push the plane onto the runway:

"All in place, power on" and "each report the communication situation" staff sent orders.

"Normal," said Cao Yan, a Kazakh military engineer

"Normal" National Defense Science and Technology Dahong Tiejun Road

"Normal" Huang Fuxing of the Chinese Academy of Sciences

"Normal" Qingda Xie Shiliu said

"Normal" Beihang Li Tangshan Road

Airplane: Tower, Dong Wu called

Tower: Please

Airplane: Dong Wu is ready, request to take off.

Tower: Can take off

Five unmanned aircraft took off into the air, and the tilt angle power system of the three-person aircraft of Cao Yan of Kazakhstan Military Industry, Hong Tiejun of the National Defense Science and Technology University, and Huang Fuxing of the Chinese Academy of Sciences flew out of several kilometers at once. The power of the 4 motors is just different. The planes of Qingda Xie Shiliu and Li Tangshan had to take off to a certain altitude before switching to fixed-wing flight, which was obviously half a beat slower than the others.

"Thankfully, the plane is finally flying! Li Tangshan said nervously, "I haven't seriously tested the plane to be able to fly safely, it's really lucky!" ”

The experts looked at the track route of the five UAVs on the big screen, and 40 minutes later, Cao Yan, the military industry of Kazakhstan, Hong Tiejun of the National Defense Science University, and Huang Fuxing of the Chinese Academy of Sciences completed the task and began to fly back. Qingda Xie Shiliu and Li Tangshan's drones were 10 minutes slower.

After another 40 minutes, Cao Yan of Kazakhstan Military Industry, Hong Tiejun of the National Defense Science and Technology University, and Huang Fuxing of the Chinese Academy of Sciences landed safely at the designated place.

At this time, there can be a drizzle in the sky, and only Qingda Xie Shiliu and Li Tangshan drones are left on the big screen, and the energy efficiency ratio of Qingda Xie Shiliu's drones seems to be higher than that of Li Tangshan. It is already about a kilometer ahead of Li Tangshan's drone.

Not long after, Qingda Xie Shiliu's drone had appeared in front of everyone's eyes, and at this time, Li Tangshan was ready to be eliminated, and he didn't expect to go home for the first time.

Li Tangshan knows that he is cramming temporarily, and his skills are really inferior.

The drone is getting closer and closer, and it is ready to start slowly landing. The rain was getting heavier and heavier, and everyone hid in the canopy that had been built yesterday.

The big screen shows that Xie Shiliu's plane is getting closer and closer to the airport, and everyone can also see Xie Shiliu's plane swaying in the rain over the airport. The current climatic conditions are still suitable for drone landing, but the difficulty will increase a lot.

Suddenly, a crosswind blew, and Qingda Xie Shiliu's drone immediately rolled several times. Qingda Xie Shiliu quickly switched to the manual mode, and tried his best to save the plane back, but unfortunately it was too close to the ground, and it fell on the rain-filled ground as soon as it rolled.

Qingda Xie Shiliu was dumbfounded. Looking at the debris of the plane all over the ground, I wanted to cry sadly without tears.

Li Tangshan's plane was no better, rolling in the air several times. Fortunately, the frame is strong enough, and after the crosswind, Li Tangshan also switched to manual mode in order to avoid Xie Shiliu's situation, quickly turned off the power of the fixed wing, and completely adopted the mode of multi-rotor flight, so that the wind resistance of the unmanned aircraft was greatly increased, Li Tangshan slowly lowered the drone a little far away from the target, and finally saw his unmanned aircraft safely landed on the wet runway in the rain, and the big stone in his heart could finally be put down.

Li Tangshan, who had not had a good rest for two days and two nights, spread directly on the chair, as if the whole person was out of strength in an instant, and infinite sleepiness swept into Li Tangshan's whole body. Li Tangshan found that he was coldly on his back, and then he realized that he was also shocked into a cold sweat. Li Tangshan closed his eyes and fell asleep in the chair, and when the staff saw that Li Tangshan was sleeping, they put a blanket on him. Everyone is tired these days, and the staff knows it very well.

At the end of the competition, the staff cleaned up the site, and the experts returned to the small conference room at the airport for the evaluation of the final results. At this time, the rain also stopped, and the sky showed a faint rainbow. The sun came out, and the staff woke up Li Tangshan, who was asleep, and asked him to come back to the room of the guest house to sleep, where it is easy to catch a cold if you sleep in the open air. Groggy Li Tangshan seemed to understand the words of the staff, and staggered towards the guest house by himself, and he didn't know how he opened the door, and he snored as soon as he touched the bed.

The next morning, Li Tangshan got up as usual and found that his stomach was particularly hungry. Only then did I realize that I had gone to bed without eating dinner or washing. Li Tangshan quickly cleaned himself up, and then went to the restaurant for breakfast.

After the expert meeting and statistics according to the relevant rules, it was announced that Cao Yan of Kazakhstan Military Industry, Hong Tiejun of the National Defense Science and Technology University, Huang Fuxing of the Chinese Academy of Sciences, and Li Tangshan of Beihang University will conduct the next round of elimination. In fact, the result was known yesterday, and the expert announcement was just a process. Li Tangshan found that Xie Shiliu had left, and inquired that Xie Shiliu had already left while he was still asleep.

The next round of questions has also come out, that is, 500 kilometers of cross-country wilderness survival, marching along the Taihang Mountains, not using modern vehicles, and arriving at the designated place within 10 days. The materials needed for the project are the 10kg of materials invested in the target of today's competition, so that everyone can get them back by themselves.

"Now the four of you come here to get the Beidou locator and a dagger," the tall staff shouted to Li Tangshan. Li Tangshan's four people got a Beidou locator and a dagger.

"Prepare to gather at 6 o'clock tomorrow morning, you have a good rest tonight, the following is a tough battle, disband!" said the leader of the expert group.