Chapter 256 Find 38 a plane to borrow!

In the end, Wang Xiaomo could not resist the temptation and decided to follow Chang Haonan's suggestion and follow the 9910 project.

In this case, many things that were not urgent at first become urgent.

"Comrade Xiao Chang, since we want to take the 9910 project as the goal, then your preliminary project demonstration..."

"Don't worry about this. After the bidding is over, I can start construction directly in Jinling, and the calculated results will be directly taken to the wind tunnel at Fucheng 29 Base for testing, so that both sides can proceed nearly simultaneously."

Chang Haonan was naturally prepared.

He has done this kind of parallel processing of multiple tasks within the limit of time more than once before, and now he is very familiar with it.

What's more, from the perspective of the aviation department, adding a wedge tail is not too complicated compared to adding a disc, and does not require frequent docking with the wind tunnel testers.

In fact, in the previous life, the Air Police 200 took about 20 months from project establishment to first flight. If it were not for the unexpected air crash, it would have been in service earlier.

Although that was done when a lot of technology had been accumulated before the project was established.

But now Chang Haonan has more trump cards, which are completely justified.

After all, it was just a demonstration before the project started, not a big job, so a few people only spent half the night to decide on the overall direction of the matter.

For Chang Haonan today, this kind of thing is already familiar and does not require the help of the system at all. Especially the data of Yun 8 itself has been digitally entered by Liang Shaoxiu and others from the 172 Factory. It can be called directly. Just put the T-shaped antenna Just add the two parts of the tail fin and the tail fin, the actual workload is not too much.

What's more, although Xu Yang and the engineers at the 14th Institute of Electrical Engineering have never studied aircraft design, they have learned algorithms to some extent, so they can still help.

The most time-consuming part is probably waiting for the results, as current computer performance simply cannot keep up with demand.

So in the next period of time, I was able to take advantage of every opportunity to analyze the aerodynamics and structure of the wedge-tail early warning aircraft——

Although some tricks have been used to reduce the demand for hardware performance when designing the pod, so there are no insurmountable obstacles in the trial production process, the electronic jamming pod is a new thing for the 14th Institute after all, and it has never been The packaging technology borrowed from the captured pod still needs to be adapted. Therefore, with the basic design already completed, it is expected that the two engineering prototypes, one large and one small, will still take about half a month to be manufactured.

This is because there is no need to consider external aerodynamic modification and other issues during the prototype stage, which reduces a lot of unnecessary man-hours, otherwise it would take longer.

……

In short, a few days later, when Chang Haonan handed over the demonstration report with numerical calculation results and several wind tunnel test data to Wang Xiaomo, who had not even had time to leave Jinling, the first sentence the latter subconsciously asked was:

"Have you already prepared the report?"

Chang Haonan naturally told the truth about this:

"That's not true. Although I have been studying this T-shaped antenna for a while, I really started to analyze it after I communicated with you that day."

"But it's only been ten days?"

Wang Xiaomo looked at the calendar next to him:

"No, it took nine and a half days. How come the data in this report is so detailed? I have worked with people from the Aviation Industry Corporation of China before, and it has never been so fast."

"To put it aside, at the beginning of last year, when the No. 713 electronic equipment testing machine was modified, it took a month just to blow up the wind tunnel. This is the efficiency that I achieved after urging Director Ding many times."

Therefore, looking at the old academician in front of him with an expression of "Either you are trying to trick me or they are trying to trick me", Chang Haonan felt that he had to explain to the former colleagues (and future colleagues) of Base 29 who he had never met before:

"Academician Wang, it's like this. If you want to do a complete wind tunnel test for a new model of aircraft, it will indeed take several months or even years. Even for a model like No. 713 with minor modifications, it will only take a month. It’s normal.”

"But after all, we are just demonstrating now, and because of the support of my calculation data, the wind tunnel test conditions can be selected more accurately, without having to slowly approach it in a large range as in the past. In a 100-hour wind tunnel, 90 hours may be spent on debugging. Now it may only require 10 hours of debugging, and the efficiency will naturally be higher.”

The No. 713 verification machine mentioned by the two just now is an equipment verification platform that was improved from the Yun-7 and belongs to the 38th Institute of Electrical Engineering.

从名气上讲，它远不及后来给歼10和歼11进行过多次雷达设备验证的079号运8验证平台，更不如后来给歼20做验证的769号图204验证平台，但却是华夏在这一领域的开端。

In fact, Chang Haonan came here today not only to hand over the demonstration report to Wang Xiaomo, but also for the purpose of borrowing this plane.

And it’s for jumping in line!

"So that's it?"

Although Wang Xiaomo, who knew that there was a mountain across the street, thought it was a bit magical, he did not continue to ask.

But he immediately realized a problem.

loss!

"Wait a minute, according to what you said, the wind tunnel that used to take 100 hours can now be completed in 20 hours. Then in the contract we signed before, the equipment fee and labor time fee are..."

Chang Haonan naturally cannot let go of this kind of problem:

"Academician Wang, your Electronic Technology Group has a big business, so you definitely won't care if these hundreds of thousands of dollars are not..."

On the one hand, the contract has been signed and there is no reason to change. On the other hand, the advance payment from the Dianke Group has been divided among several units and individuals involved in the work.

However, Wang Xiaomo never really thought about getting the money back. After joking with Chang Haonan, he turned his attention to the report in his hand:

"The writing is very skillful, it doesn't feel like it's my first time..."

“Best of all, I’ve read a lot in the past, so I can get started faster when I start writing…”

In his previous life, Chang Haonan did not dare to talk about other things. The hard work of writing reports highlighted his rich experience. Although it was more than 20 years ago, the writing style of the aviation industry system has not changed much, and it can be seamlessly connected.

Then he followed Wang Xiaomo's progress of flipping through the report and began to introduce the contents.

"The T-shaped antenna will increase the cruise resistance of the entire aircraft by about 9%, and move the focus of the entire aircraft back by about 2.5% of the average aerodynamic chord. However, we can solve this change by adjusting the distribution of equipment in the aircraft, and combined with the tail fin to bring With a resistance of 2%, the economic cruising speed of the wedge-tail early warning aircraft will be about 8-40km/h lower than that of the Y-50 prototype."

"In terms of flight stability, the T-shaped antenna and the ventral fin itself will enhance the directional stability of the aircraft, but the former will also destroy the contribution of the tail to directional stability. Generally speaking, after the modification, the yaw moment coefficient and lateral force The derivatives of the coefficients with respect to the sideslip angle decrease by 0.009 and increase by 0.0005 respectively, indicating that under the action of appropriate ventral fins, the directional stability of the entire aircraft has reached an acceptable state..."

Although Wang Xiaomo is not a professional in aircraft design, he quickly understood the entire content of the report based on the data charts and Chang Haonan's explanation.

"With this report, the probability of project approval will increase a lot."

The old academician looked pleased and closed the report again, then put it back into the briefcase with other materials.

Chang Haonan realized that it was time to borrow the plane:

"Academician Wang, I have an unkind invitation this time..."

Wang Xiaomo was in a good mood and showed no signs of guarding:

"You said, as long as I can personally do it and it doesn't violate the principles, I can mention it."

"Cough cough..."

Chang Haonan was not polite:

"We hope to borrow the No. 38 electronic equipment verification machine from the 713th Institute. It will be used probably next week."

"..."

Wang Xiaomo's movement of organizing his briefcase suddenly stopped.