Set sail1992

Chapter 365 This thing is too simple for us
Spending millions of dollars on engines right now in 1993...

Zhang Qihang thinks it's okay, let's do the engine thing by himself, not to mention whether the above can agree, even if he can agree, from application to approval to purchase and later maintenance, it will be a lot of trouble.

Professor Xu naturally didn't understand this, but he was very excited: "The heavier the engine, the heavier it is. Judging from the data of the Ange R80 helicopter that I just heard, even if the maximum take-off weight is 100 kg, the required power is only 22 or 80 horsepower. At this time, the engine speed is still in the yellow zone, so it is not a big problem.

And you are drones spraying pesticides, so you don’t need to fly to an altitude of hundreds of thousands of meters like a manned aircraft, and the operating height is at most three to five meters. At this time, the engine speed will drop back to the green zone. "

"Yes, teacher, I think so too," Zhang Qihang said with a smile: "The problem now is that we need to ask the teachers of our Astronautics Institute to help us calculate whether this motivation is enough, after all, it is only ourselves Calculated."

"exactly……"

Only then did Professor Xu come to his senses, and then turned to look at Vice President Zhao.

Vice President Zhao also had an excited face, nodded and said, "I'll call right now..."

Professor Xu said impatiently: "Why are you calling, let's go directly!"

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

The general manager of Huateng Company came over, and the entire Astronautics Institute suddenly became lively.

To be honest, after seeing the cooperation between the School of Automotive Engineering and Huateng Company, those professors, associate professors, and lecturers are earning a lot of money. The monthly fixed consulting fee is 2000 yuan. Teachers from other schools How could you not be jealous?
But there is no way to be jealous. The Huateng Machinery Manufacturing Company produces motorcycles and has nothing to do with my aerospace technology. At this time, Zhang Qihang actually came to the door!

After hearing that Huateng Company was going to learn from Dongying and develop a remote-controlled unmanned helicopter for agricultural plant protection, and hoped to get the support of the Academy of Astronautics, the leaders and professors of the Academy of Astronautics were immediately overjoyed. : Here comes a chance to earn extra money...

Regarding the calculation of how much power is needed for a helicopter with a take-off weight of 80 kg and how much the weight of the helicopter will increase and how much additional power will be needed if the engine weighs 30 kg, for Zhang Qihang and Xu To the professor, it was blinding eyes, but to the professors from the School of Astronautics, it was no different from asking undergraduates from the Department of Mathematics to do elementary school math problems.

Vice President An Guoqing'an, vice president of the School of Aerospace Sciences and also a special consultant for Hafei, quickly gave the answer: "If you only have such an engine and insist that it must have a load of 20 kilograms, don't consider it. Fuel, the maximum take-off weight of this aircraft including load is about 90 kg;

Suppose you install a 4-liter fuel tank and set the load at about 25 kilograms, then the maximum take-off weight is just about 100 kilograms, and the power required for the aircraft to take off at this time is about 18 horsepower. "

As long as 18 horsepower, can you have a remote control helicopter with a maximum take-off weight of 100 kg and a load of 25 kg?

This answer surprised and delighted Zhang Qihang, Professor Xu, and Vice President Zhao: Isn't the power of Zhang Qihang's 28-horsepower V2 engine more than enough?
On the other hand, Vice President An was excited but also anxious: "Student Zhang, this item of yours is not a problem for our School of Aerospace Engineering at all, this..."

Naturally, it is impossible for Zhang Qihang to just listen to Vice President An's words, and asked seriously: "President An, I know that the following words may not be respectful to you and our college, but I am a pure-hearted person when it comes to aircraft." I'm a layman, so don't be angry if you have some questions..."

As soon as Zhang Qihang said this, Vice President An immediately laughed.

Of course he knew that Zhang Qihang was a graduate student led by Professor Xu, and a young man who didn't understand aviation, especially helicopters, asked some silly and naive questions that people in the industry thought were stupid and naive. "If you have any questions, just ask."

"Okay," Zhang Qihang really said: "Mr. An, if we can cooperate, apart from the engine, the overall layout of the drone, the main reducer, the auxiliary reducer, and the rotor system, I will hand over the tail rotor and the corresponding transmission system to you, and I will even put forward some other requirements.

But I heard that the development of the main reducer and the rotor of the helicopter is very difficult. For example, Hafei has not been able to fully mass-produce the main reducer of the Z-9. Although ours is a remote control aircraft, it is also a helicopter. And I heard that our country's material level is much lower than that of the West, this...so..."

Although Zhang Qihang was vague, how could Vice President An not understand what he meant?It's nothing more than worrying that Harbin Institute of Technology can't handle it.

Zhang Qihang is not surprised that he has such an idea, but nodded and said: "I understand what you mean, don't worry about this, our academy can completely develop a reducer and a matching propeller hub that meet your needs , Rotor."

Speaking of this, seeing Zhang Qihang's suspicious eyes, Vice President An was not angry, but smiled: "Student Zhang, your unit is an engine manufacturer, don't you know the relationship between force and material?"

Hearing this, Zhang Qihang slapped his head violently, with a look of embarrassment: I am still a motorcycle maker, so I forgot about it.

The smaller the force, the lower the requirements for materials. For example, the gear set of the same type, the clockwork gears on the toy cars played by children can be made of plastic, but the gears of the main reducer of the helicopter, the requirements for materials are the same. grown up...

The same is true for reducers and rotors. The same is true for reducers and rotors. The rotors of remote-controlled helicopter toys can be made of plastic, which can be used for helicopters with a maximum take-off weight of several tons or even tens of tons such as Zhi-8 and Zhi-9. In other words, the processing and manufacturing of reducers and rotors is extremely difficult.

As for the UAV that our company is going to do this time, the maximum take-off weight is only 100 kilograms, and the required power is only 18 horsepower. How advanced materials can be used for such a small power?
Is it a special alloy or a forging made by a [-]-ton hydraulic press?
Don't be kidding, there is no need for such a good material at all, and a slightly better material will fully meet the needs.

(End of this chapter)