Zhu Jingyuan was particularly speechless, he came to the palace, his main quest was not completed, but the side quest was up.

The old emperor suddenly wanted to go to the consortium, mostly with reference to his own suggestions, and arranged the direction of the consortium's reform.

What can Zhu Jingyuan do, he can only follow his father and Zou Shangshu, say goodbye to Cao Junji and others, and leave the palace and return to the Ministry of Industry by carriage.

No matter what the old emperor's idea is, he has to get the plane out first, and he needs the patent of the plane anyway.

So after arriving at the Ministry of Industry, Zhu Jingyuan asked Wang Lai for directions and went directly to Li Rui's office, which was in charge of aircraft design.

In a room the size of a classroom, there are eight desks facing each other on both sides of the wall, and the layout looks like an ordinary middle school teacher's office.

Li Rui was lying on a large table drawing drawings, surrounded by several officials wearing Ministry of Industry clothes.

The officials noticed Zhu Jingyuan coming in, and although they didn't know Zhu Jingyuan's identity, they all recognized the robe of the emperor and grandson, and bowed down to say hello.

"No need to be polite......"

Zhu Jingyuan hurriedly returned the salute, and at the same time explained the intention in his mouth, and walked quickly to Li Rui's side:

"I'm here to work with Lee, the creator of the new wing and controllers. Director Li, how is the progress now, can you go to the test today? ”

When Li Rui heard Zhu Jingyuan's voice, he glanced back slightly, got up and said hello, and explained:

"Tell Your Highness, the design drawings on my side will be completed soon, but it will take time to modify the test aircraft, mainly because the wing will be redone as a whole......"

Zhu Jingyuan immediately waved his hand and said:

"You don't have to redo it, just paste the underside of the wing with skin."

Li Rui and the surrounding officials were stunned:

"On the paste?"

Zhu Jingyuan nodded directly and said:

"Yes, the key to gaining lift is a relatively rounded bulge on the top of the wing, and a relatively flat and smooth underneath.

"As for what form of bulge has the greatest lift, it is a matter of detail in the pursuit of the limit in the future.

"The wings of the planes you tested should all look like slices cut from the edges of hollow barrels, right?

"Now you can test the open batter underneath and change it to a solid column shape.

"It's not too late to complete the test as soon as possible to make sure it can actually fly, and then slowly determine the optimal wing shape.

"If you have a goal that you can do, you'll be more motivated."

Li Rui thought about it, and it was indeed like this:

"Okay, okay, let's try it first......"

Li Rui sat down and continued to draw the drawings, finishing the last remaining points.

Zhu Jingyuan was a little anxious, so he asked his father to borrow a car, ready to take himself and Li Rui to the test site of the Ministry of Industry with the drawings.

Zhu Jianyan hesitated again and again, and finally went with him.

There are many test sites of the Ministry of Industry, which are scattered around and around the city and in other places according to the danger, the degree of secrecy, and the type and scale of the required sites.

The danger of flying machines is average, and the degree of secrecy is not very high, but the required site is relatively large, and it is selected in a large outdoor test site in the west of the city.

Zhu Jianyan's driver drove Zhu Jianyan, Zhu Jingyuan, and Li Rui directly to the test site.

Li Rui met with the person in charge of the test site, and took Zhu Jingyuan and his son to the warehouse where the test equipment for flying machines was stored to check the original test aircraft.

The earliest test aircraft were very different from the mature aircraft of later generations.

From the era of World War I to modern times, the basic structure of most aircraft is a typical longitudinal fuselage, plus transverse wings.

Coupled with the horizontal tail, vertical tail, and various forms of engines, the overall design tends to be unified.

However, the early test aircraft did not have a fixed form at all, not to mention that there were three major directions: flapping wing, rotor wing, and fixed wing.

So in this warehouse, there are big birds that seem to be able to wave their wings, hanging baskets with giant bamboo dragonflies on their heads, and round frames with multi-layer wing plates in the middle.

However, the largest number are those with metal frame support, one, two, or even three or four layers of straight wings superimposed on each other.

In fact, this change already shows that their design is gradually moving in the right direction.

Those involved in the design and experiment should have discovered a certain rule, and the pure deployment of the horizontal and vertical fixed wing is the simplest design that can provide lift.

But they haven't found the right answer yet, and they're still trying to figure out the right wing shape.

Most of those wings only have wings, and there is no proper fuselage.

A small number of them are equipped with bird-like heads and fan-shaped tails, but the heads and tails are immobile, and they look more like giant kites.

Most of them have only two stacked wings, with an engine tied to the middle and two propellers tied to the front, but the size and wing structure are not exactly the same.

The two young craftsmen in their twenties who were in charge of the warehouse here followed Li Rui and looked at the things in the warehouse, and one of them said with great interest:

"Director Li, what are you doing today, flapping wings or rotors?"

The craftsmen here also know that Li Rui actually doesn't approve of fixed-wing aircraft, and is relatively more supportive of gyroplanes and ornithopters.

In fact, most people have this point of view, the ornithopter is to fly against birds, and the gyroplane can refer to bamboo dragonflies, which are sure to fly.

Fixed wings can only glide, and if you want to fly like a kite, you have to be light enough to meet the strong wind.

As a result, today's Li Rui replied expressionlessly:

"Today, the fixed wing will be measured, but it will be modified first, and you will find two more people to come over and prepare the materials according to my drawing requirements."

The two craftsmen were a little surprised, how did Director Li measure the fixed wing? Can that thing really fly?

But they just do the work, and the main person who does the experiment says that if he wants to measure, then he will prepare something.

The two craftsmen left with the drawings, and Li Rui turned to Zhu Jingyuan and his son:

"Your Highnesses, among the existing fixed-wing test aircraft here, there are five sets that are relatively reasonable and proper.

"The main difference is in the size of the wing, the weight and power of the engines used.

"What standard do you think is appropriate?"

When Zhu Jingyuan heard this question, he suddenly had another curiosity:

"Director Li, what is the maximum power of the engine that can be installed in the shield car and the plane now?"

This question is actually a bit sensitive, if an ordinary person asks this kind of question, Li Rui will not be able to answer, or will not answer the correct data.

But Zhu Jingyuan is obviously not an ordinary person, especially Li Rui thought of Zou Bingtai's arrangement, so he directly explained the situation:

"The current maximum power of the engine mounted on the shield car should be around 80 horsepower.

"Actually, it can also be installed on an airplane, but its weight is too heavy compared to the airplane, and it is likely that the plane will not be able to fly at all.

"In our actual tests, the maximum power of the engine installed in the aircraft was 60 horsepower.

"Of course, the plane never flew in the end......"

Zhu Jingyuan blinked, and felt so pitiful when he heard it, the family car in his previous life was almost 200 horsepower, and this tank was only 80 horsepower.

But is the horsepower of this world the same unit as the horsepower of oneself? It seems like it's really ......

It was one of the power units in the "Ming Metric" unit system set by Emperor Shizu.

One horsepower is seventy-five kilograms of horsepower per second, which is the same as the original world metric horsepower.