The Courtyard House: Xu Damao's Aunt is the Queen of Women

Suddenly, Mr. Qian smiled, a truly relieved smile.

"That's exactly what I've been waiting for. I'm not here to interrogate you; I'm here to confirm whether you are truly capable of single-handedly managing the entire aerospace system for the country."

In the past, Liu Hao would not have revealed his talent, firstly because he didn't want to be a scientist, and secondly because he was afraid of being dissected.

Now, no one can force him to do things he doesn't want to do, so he has no worries.

Moreover, a change in identity requires a change in mindset.

To prove my abilities and gain the respect of my biological parents…

There's a song that goes like this: We are the successors of communism, inheriting the glorious traditions of our revolutionary predecessors, loving our motherland and our people!

"Uncle-Master, you can understand it as: I can provide a solution for anything that can be written as an equation, and I can provide the simplest and most engineering-oriented form for anything that can be solved."

This statement is neither arrogant nor haughty; it simply states the facts.

Mr. Qian took a deep breath and clapped his hands: "Alright, then I won't ask any small questions, I'll ask about the system."

"I'll ask you questions in four areas, three questions in each area. Answer them all in one go. You don't need to explain too much. I just need your conclusions."

"please."

"The first area: ballistic missiles."

Professor Qian spoke rapidly, asking, "First, the characteristics of the minimum energy ballistic trajectory? Second, the boundary between the vacuum phase and the atmospheric phase? Third, the relationship between range and reentry angle?"

Liu Hao answered quickly, almost instantly.

"First, the altitude at the perigee is the lowest, resulting in the smallest total impact. Second, at an altitude of approximately 100km, aerodynamics are negligible. Third, the longer the range, the smaller the re-entry angle, making it more difficult to control."

"The second area, aerothermodynamics, includes: 1. The basic structure of hypersonic flow fields? 2. The relationship between the shock layer and the boundary layer? 3. The effect of ablation retreat rate on heat flux?"

Liu Hao pondered for two seconds, cleared his throat, and replied: "First, bow-shaped shock wave, entropy layer, boundary layer, wake; second, strong mutual interference between shock wave and boundary layer at high Mach; third, ablation mass injection reduces heat flux."

"The third area is structural strength. First, what are the most dangerous loads in missile flight? Second, what determines the flutter boundary? Third, how is strength reduced under temperature and load coupling?"

"1. Maximum dynamic pressure point; 2. Mach number, dynamic pressure, stiffness, damping; 3. Reduced according to high temperature elastic modulus, and enveloped by safety factor."

Old Qian's eyes gleamed, and he looked at Liu Hao as if he were looking at a rare treasure.

"The fourth area is control and guidance. First, what are the main error sources in inertial guidance? Second, how significant is the impact of gyroscope drift? Third, can analytical formulas be used to compensate for deviations?"

"First, initial alignment, gyroscope drift, accelerometer error; second, full-process accumulation, kilometer-level; third, ability to establish error propagation equation and real-time compensation."

As Liu Hao's magnetic and gentle voice fell, Old Qian looked at him, his eyes no longer filled with scrutiny, but with admiration.

He has seen geniuses, but he has never seen a polymath who is proficient in all fields.

"Xiao Hao."

Old Qian's voice deepened, and he said seriously, "I'll ask you one more honest question: how long do you take to calculate something? For a complex trajectory, others take three days to calculate with a hand-cranked calculator, how long do you take?"

This was Qian Lao's most crucial test; he wanted to find out Liu Hao's bottom line in computing power.

Liu Hao understood immediately, but he refused to reveal his mental calculation skills and answered only with his scholarly talent.

"Uncle Master, others take three days to calculate because they have to calculate step by step, verify step by step, and check for errors step by step. I am different. When I see the equation, I can solve it by considering the path, error, singularity, and applicable range."

Mr. Qian didn't quite understand: could the human brain really be that powerful?

"So, what takes others days to solve, you can get a usable solution in just a few minutes?"

"That won't do!"

Mr. Qian breathed a sigh of relief and was about to speak when he heard Liu Hao say something.

"It will take at least ten minutes!"

"..."

Is there a difference?

Mr. Qian uttered a great statement, but he did not pursue the underlying principles, as it would have been useless to ask. It was a talent that others could not learn.

"I understand. From today onwards, your abilities will be a top state secret. Apart from your parents-in-law, Ye Xi and Ye Juan, do not reveal your abilities to anyone else!"

Liu Hao knew the consequences of exposing his abilities; the North Soviet Union and the United States would definitely kill him.

"I will follow my master's instructions completely."

Mr. Qian took out a thin stack of papers, only a few pages long.

"These are the seven most urgent questions, related to the experimental protocol that must be ready by the beginning of next month. I'll read them to you, and you give me the answers verbally now. I'll write them down; you don't need to write them down."

From this moment forward, everything that happens here will never be archived or written down.

Liu Hao guessed, could it be a large missile?

"Please read the question, Master."

Old Qian started speaking directly, one point after another.

"First, with a range of 2800 kilometers, a minimum energy trajectory, a re-entry angle controlled at -6.5 degrees, and an initial velocity deviation of 0.5 m/s, what is the impact point deviation?"

"Approximately 267 meters."

"Secondly, Mach number 12, altitude 45km, conical warhead, half-angle 15 degrees, approximate stagnation point heat flux?"

"On the order of approximately 2 × 10⁸ W/m²."

Professor Qian quickly jotted it down and continued, "Third, if the gyroscope drifts 0.1 degrees for one hour and has a flight time of 330 seconds, what is the heading error?"

"Approximately 0.009 degrees, with a lateral deviation of approximately 400 meters."

"Fourth, the height, velocity, and dynamic pressure value of the point of maximum dynamic pressure?"

Liu Hao subconsciously took out a cigarette, but then remembered that Old Qian neither smoked nor drank, so he quickly put it away.

Old Qian laughed and said, "It's alright, go ahead and smoke! I'm used to secondhand smoke. Smoking less is bad for your health."

"Thank you, Senior Uncle!"

Liu Hao thanked him and lit a cigarette.

"Altitude 11 kilometers, speed Mach number 3.2, dynamic pressure approximately 45 kPa."

Fifth, consider the Earth's J2 term: semi-major axis, eccentricity, and rate of change of inclination?

"Eccentricity, constant tilt angle, long-term precession of the longitude of the ascending node."

"Sixth, what are the minimum and maximum allowable re-entry angles for the re-entry corridor width?"

"The width is about 0.5 degrees. Too steep and it will burn; too shallow and it will bounce."

"Seventh, the ablation efficiency of thermal protection materials, requiring the warhead surface temperature to not exceed 3200K, and the heat sink design specifications?"

"It must be an ablation type, with a heat sink capacity of not less than 1.8×10⁷ J/m²."

There were seven questions. Qian Lao read one aloud, and Liu Hao answered one.

Without reciting formulas, without drafting, without thinking, without checking, the answer comes out fluently, with accurate values, correct units, and clear engineering significance.

The pen in Mr. Qian's hand paused in mid-air several times; the more he wrote, the more alarmed he became.

The more I listened, the more I understood Liu Hao's importance.

After answering the seven questions, the meeting room fell silent. Professor Qian put down his pen, looked at Liu Hao, and remained silent for a long time.

Throughout his life, he discovered, cultivated, and united countless top talents for the country.

But no one else could give him the same sense of confidence as Liu Hao.

He knew that this confidence stemmed from absolute self-assurance in his own abilities!

God bless China! God bless China!

"Xiao Hao!"

In a deep, solemn voice, Mr. Qian said, "Do you know how much trouble you've solved for the country in just these past few minutes?"