In the vertical take-off and landing state, the engine is vertical to the ground. The airflow hits the wings and forms a vortex. It is easy to become unbalanced on both sides. If there is a bit of cross wind at this time, it will definitely flip over! !
Everyone suppressed their exclamations in their throats, fearing that they would affect the operator's judgment.
I don’t know who said loudly: “Don’t transform yet. Don’t slow down either.”
The operator replied: "Ang, what then?"
The man said: "Wait, wait for the wind to pass."
As soon as he finished speaking, a stronger cross wind swept over, blowing the originally tilted rotorcraft directly over.
Everyone could not suppress their screams.
The operator was completely stunned: "What should I do?"
The man: "Hang on. Don't slow down and let it circle. As long as it doesn't crash for the time being, it's considered a success."
Jiang Qiangjun turned to Li Wenjun and said: "We have tried many methods, but there is no way to overcome the vortex airflow caused by the engine during takeoff and landing."
Then he found himself talking to nothing.
"Where's Li Wenjun?"
He glared at the others.
Those people all pointed to the window.
Jiang Qiangjun suddenly turned his head and saw Li Wenjun on the runway, driving his car towards the operator.
"Damn it." He held his head, "This kid is really not afraid of death."
Tao Guangming gritted his teeth: "This bastard scolds Dong Qingjun every day, and he doesn't want his own life."
Only then did everyone realize that it was Li Wenjun who had just issued the order.
Li Wenjun drove his car and parked behind the operating vehicle. He ran down and reached in through the window to grab the remote control. He said to the two men, "Go in and hide."
The operator wanted to speak, but immediately shut his mouth.
Because Li Wenjun had already begun to operate the rotorcraft in the air.
Instead of slowing down, he accelerated, letting the gyrocopter fly around the airport. When turning, he tilted as much as possible against the wind, and then turned back. He didn't land in a hurry, and continued to fly around while lowering his altitude while watching the wind direction in the center of the lawn. The bag, when it looked small, quickly decelerated, hovered, deformed, and landed.
The gyrocopter landed steadily on the tarmac.
When the gyrocopter's propellers stopped, everyone breathed a sigh of relief and then burst into applause.
Li Wenjun handed the remote control back to the operator and patted him on the shoulder: "Young man, the more critical the situation, the less likely you are to panic."
The man was a little stunned and nodded: "I understand."
Then I suddenly realized: Tsk, something feels wrong.
I'm one year older than him.
Li Wenjun drove back to the control tower.
Jiang Qiangjun said with a dark face: "You can just calm down."
Tao Guangming wanted to curse, but he thought about the little calculations he had made on the way here and held back.
Li Wenjun smiled: "If I don't go to the rescue, something will happen."
Jiang Qiangjun pursed his lips and raised his chin to the manager next to him.
The manager said into the intercom: "Try the quadcopter."
In order to save face, Jiang Qiangjun said to Li Wenjun and Tao Guangming: "The four-rotor is much more stable than the two-rotor."
After all, there is drone flight technology as the basis, steering, balance and so on are all based on the gourd.
Li Wenjun nodded lightly.
The operator over there started the quadcopter model.
The quad-rotor tilting drone is indeed much more stable when taking off.
When there was a cross wind, the whole thing just veered off.
Up in the air, a bird suddenly flew out of nowhere and hit one of the engines.
The engine was smoking and soon stopped.
The entire gyrocopter began to tip toward the failed engine.
The manager was also stupid at this moment: it was stupid, as if God was deliberately against them.
If Li Wenjun doesn't come, the years will be quiet.
As soon as Li Wenjun arrived, all kinds of weird questions popped up.
The operator was clearly struggling with the choice between running and not running.
He took a step back sideways, but his hand was still stretched out far away.
Li Wenjun grabbed the walkie-talkie and said to the operator: "Don't stop, let the three still-working engines slow down slowly to lower the altitude."
The operator trembled and said, "Okay."
The tilt-rotor aircraft descended slowly and crookedly.
Li Wenjun said to the intercom: "Slow down, you must slow down slowly. The closer you are to the ground, the slower you must slow down."
The gyrocopter almost hovered in the air and slowly lowered to a height of just over one meter above the ground.
Li Wenjun stared at the windsock, waited for the orange-red mixed with white stripes to fall, and said: "Turn off the engine."
The gyrocopter landed on the ground with a muffled sound, like an exhausted soldier who finally couldn't support himself and fell.
Is it okay? There's no smoke or fire. The damage shouldn't be serious.
Li Wenjun said into the intercom: "It's a safe landing. That's great."
The man replied: "Hey, it all depends on Director Li's command."
Li Wenjun smiled and said: "To sum up, today is still a success, and the flaws do not hide the advantages."
Jiang Qiangjun knew that he was comforting them and said, "Do you have any good ideas? Whether it is a four-rotor or a two-rotor, the high-speed and high-heat gas emitted by the take-off and landing engines is a big problem, not to mention causing vortices that affect your own flight safety. , if it takes off and lands on an aircraft carrier, I'm afraid it will burn the deck."
Li Wenjun said: "So the take-off process must be fast, but the tilt rotor is technically very difficult to operate, and accidents can easily occur if the take-off is not careful, so this is an irreconcilable contradiction. We can only find ways to overcome it from these two aspects, The first is to improve its flight stability, the most important thing is its ability to withstand cross winds, and the second is to improve the pilot's technical capabilities."
Jiang Qiangjun: "We have also thought about transforming the engine into a shape that is not perpendicular to the ground, but parallel to the ground. However, if the engine is parallel to the ground, the exhaust gas will be ejected backward instead of downward, so it will cause forward With the same thrust as an ordinary airplane, it will fly forward, but it will not take off and land vertically."
Li Wenjun nodded: "Well, yes. Moreover, the engine is parallel to the ground and the rotor is perpendicular to the ground. This makes the transmission device more complex and more likely to cause problems. So you can try it, but it is estimated to be more difficult. Whether it is a quad-rotor or a dual-rotor , I suggest you think more about the backup plan design when one engine or even two engines fail. After all, once a failure occurs, if there is no backup plan, the crash rate is 100%."
Jiang Qiangjun: "Oh, this thing is so complicated. It's much more difficult than helicopters and ordinary airplanes."
Li Wenjun smiled: "Yes. It is difficult. But once it is done, it is a sharp tool. It has the flexibility and convenience of helicopter hovering and the speed and distance of ordinary aircraft. So it is still worth the effort."
Jiang Qiangjun nodded to Li Wenjun, and Li Wenjun followed him to a place where no one was around.
Jiang Qiangjun: "I heard that you got the aircraft carrier back. Does Yang Shouzhuo want you to be a carrier-based helicopter?"
Li Wenjun: "Not yet. The main reason is that we don't know when the aircraft carrier will be fully built."
