Set sail1992

Chapter 1447 Take the initiative to take the blame

Paddle blade?

  engine?

After hearing Zhang Qihang's reminder, Wang Tao and Li Dong, who had just been panicking under the gaze of so many big guys and couldn't understand why this situation had occurred, suddenly had their eyes lit up and quickly checked the power output parameters of the engine.

After checking the condition of the engine, the two of them breathed a sigh of relief and explained to Zhang Qihang with a guilty look on their faces: "Mr. Zhang, it's really an engine problem."

Director Liu standing by was a little surprised: "Is it a problem with the engine?"

Zhang Qihang explained to Director Liu and other comrades present: "The engine used in our drone is a flat-type engine, which is suitable for altitudes below 3500 meters. Once the flight altitude exceeds 3500 meters, the engine power output will have great problems due to the decrease in air density.

As a medium-sized drone, this altitude is definitely enough for daily use, but when we modified the propeller blades, we forgot to adjust the engine adaptively at the same time, which led to the engine output being insufficient after the flight altitude exceeded 3500 meters. "

Although Zhang Qihang took the initiative to take the responsibility, other comrades at the scene could not just listen to Zhang Qihang's one-sided words. Director Liu took the initiative to ask: "Mr. Zhang, what you said makes sense, but how can you prove that the failure this time was only related to the engine and the blade military attaché?"

"This is a good question. Look here," Zhang Qihang pointed to the two curves on the laptop screen and explained to everyone: "Please look, this is the power output curve of the engine, and this is the altitude climbing curve of the drone.

After the altitude exceeds 3500 meters, the power output begins to drop significantly, and as the power decreases, the climbing speed of the drone also begins to decrease, and the relationship is basically proportional.

This shows that there is no problem with the efficiency of the blades during this process.

If there are problems with both the engine's power output and the blade's efficiency, the drone will climb more slowly and the difference will be even greater.

On the other hand, the maximum hovering altitude of our drone was only 3000 meters before, but now it can climb to 4000 meters without adjusting the engine just by replacing a pair of blades, which also proves the performance of this high-altitude blade. "

  That’s the truth!

After hearing what Zhang Qihang said, everyone reacted and smiled.

Indeed, everyone is familiar with this drone. We all know that the maximum flight altitude of this drone is only 3000 meters. Now it can fly to 4000 meters just by replacing a pair of blades. If the engine is also optimized in the next step, there is indeed a great hope that it can fly to an altitude of 6000 meters.

Thinking of this, the leader who was carrying four small stars on the scene also smiled: "So, although today's test was not completely successful, it is still half successful."

As soon as the leader spoke, other comrades followed suit and expressed their agreement...

"Yes, today's test has at least verified that this plateau propeller blade is effective."

"As long as there is no problem with this propeller blade, the engine problem can be easily solved..."

…………

The leader was not an expert in flight and aero engines. As an old man, he did not know how to solve the problem of engine efficiency at high altitudes. So after hesitating for a while, he asked Zhang Qihang, "Mr. Zhang, is the problem of engine air intake at high altitudes... easy to solve?"

"It's very simple. It can be solved with a turbocharger."

"Turbocharger?" The leader was a little surprised: "Are you talking about the turbocharger used in car engines?"

In the leader's impression, turbochargers are used on car engines. Can this thing be used on airplanes? "Yes, it is the turbocharger used on car engines," Zhang Qihang explained with a smile, "In fact, the turbocharger on the car is the decentralization of aviation technology. Early aircraft also encountered the problem of poor high-altitude performance. Later, in order to improve the high-altitude performance of the engine, the turbocharger was invented. In the later period, even the first-stage supercharging could not meet the high-altitude combat requirements of fighter jets, and two-stage supercharging was required.

After World War II, supercharging technology was gradually applied to civilian vehicles and some small aircraft that still used piston aircraft engines.

At this point, Zhang Qihang apologized to his superiors again: "It was all my fault this time. I didn't check the plane. Otherwise, I wouldn't have made the leaders work so hard in vain."

Professor Wu's ears turned red when he heard this, and he felt extremely ashamed.

It is normal for students to make mistakes as they are in the learning stage. But as Wang Tao and Li Dong's teacher, he has the responsibility to help students find out the gaps and check their homework. However, he neglected to check the drone and did not even notice that the engine had not been adjusted for high-altitude adaptability. Zhang Qihang's words were basically taking the blame for himself.

He was about to step forward and take the responsibility on himself, but Zhang Qihang shook his head slightly.

"So that's what happened. I understand now," the leader suddenly realized. He then waved his hands again and again, "Mr. Zhang, you don't have to apologize. This has already proven the performance of this blade."

At this point, he paused for a moment and asked, "Mr. Zhang, I would like to make a suggestion."

"You say."

"Can you modify a drone with a larger payload this time?" The leader's eyes were burning with anxiety. "As you know, winter is coming soon. Our brothers in border areas have a great demand for drones with a certain payload. Even if it is only 50 kilograms, it can deliver some much-needed supplies to them in an emergency."

Zhang Qihang did not hesitate and nodded vigorously: "Don't worry, leader!"

The leader didn't say anything, but just shook Zhang Qihang's hand vigorously.

........................

Zhang Qihang stayed to drink. He had to drink after today's incident.

On the way back in the car, Wang Tao and Li Dong no longer had the excitement they had before they came. They were like cabbage leaves hit by frost, wilted.

Wang Tao hesitated for a moment, then took the initiative to say, "Teacher, I'm sorry..."

"The main responsibility for today's incident lies with me," Professor Wu waved his hand. "I am your teacher, so I am responsible for your homework. Today's test has proven the performance of the plateau blade you designed. You have proven your ability. On the contrary, I am responsible for this mistake.

But you also heard what the leader said just now, tell me, can you come up with what the garrison wants next?"

"can!"

Wang Tao and Li Dong pursed their lips at the same time.