Ask Sword

The weather is slightly cool, the flowers and plants on the roadside are covered with crystal dew, and the fallen leaves of various colors are piled up under the trees, like a thick carpet.

The Furong Garden in the southeast of Chang'an City was the royal forest garden of the former Sui and Yu dynasties. It is located on the south bank of Qujiang Pond, covering an area of ​​more than 30 hectares, close to Chang'an Waiguo City, surrounded by high walls.

It has to be said that although the emperors of the former Sui Dynasty were extravagant and lustful, their aesthetic level was still high. There are countless palaces in the Furong Garden built by them one after another, with ten steps on the first floor and five steps on the first floor, with continuous ups and downs.

There are dancing pavilions and rockeries in patches, and every few steps, you can enjoy a completely different view. It is no wonder that Furong Garden is the busiest and most visited scenic spot in Chang'an.

However, Bian Chenpei, who is located above the pavilion, has no intention of appreciating the scenery.

He was sitting with a group of Taihao Mountain disciples, looking through the window at the bustling crowd below, unconsciously rubbing a waist card back and forth in his hand——

The outer part of Furong Garden is open to the citizens of Chang'an, but there are several forbidden gardens of different levels inside, and you need to hold tokens of different levels to enter them.

At this moment, those standing below are all students from various countries,

In the distance, more noisy human voices can be faintly heard.

The news of Li Ang's bet with visitors from Taihao Mountain spread out somehow.

How can foreign students participating in academic exchanges miss such a good show,

And those Chang'an citizens who have a high trust in the academy and Li Ang, after hearing about this incident, also spontaneously came to the Furong Garden to join in the fun, and it was considered an autumn walk.

After coming and going, it turned out to be more lively than the festival.

If you look outside the wall, you can even see hawkers setting up stalls and starting to sell meals, snacks, candy and toys.

Bian Chenpei's face was a little ugly. He was always the protagonist in Zhou Guo and Taihao Mountain. He had been treated like this before.

This group of Yu people.

Why don't the people from the academy come?

A disciple of Mount Taihao couldn't help but asked, What time is the Sichu time agreed upon?

Another person said: Wait a little longer, the Haotian bell hasn't rung yet.

Before the words were finished, there was a commotion downstairs.

Bian Chenpei immediately stood up and looked down, and sure enough, he saw all the people in the school coming from the entrance of the garden.

The leader is Xuegong Jijiu Chen Danqiu, who walks in the forefront, followed by Su Feng, Ph.

Li Ang walked in the middle of the team, with a faint smile on his face, followed by a row of flat carriages, each of which was wrapped in a thick layer of cloth.

Through the cloth, the raised shape of the goods can be vaguely seen.

It's really coming.

Bian Chenpei pursed his lips slightly, his heart tightened involuntarily, and a trace of regret flashed in his heart.

Let's go down.

Yu Feiyu, who had been flipping through the Haotian classics in the corner, stood up and led the Taihaoshan students down the pavilion, frowning slightly, and went forward to meet everyone in the academy.

Chen Jijiu.

Special Envoy Yu.

Chen Danqiu and Yu Feiyu greeted each other nonchalantly, and explained casually, This model airplane was built by the academy with a lot of manpower and material resources, so we found some more carriages and escorted them here.

Um.

Yu Feiyu didn't intend to talk too much, Then shall we start?

good.

Chen Danqiu turned his head and glanced at Su Feng. Su Feng nodded, greeted his disciples, and unwrapped the cloth package from the carriage, revealing pieces of parts.

————

Is that the newly developed model airplane that can carry people?

In the palaces and pavilions of Furong Garden in the distance, Emperor Yu leaned on the guardrail, holding the telescope recently enshrined by Luli Academy, and looked into the distance.

I'll take a look.

Next to him, Empress Xue, who was holding her young adopted daughter, also held another smaller and more exquisite binocular telescope with a thin gold chain, looking into the distance.

Ma'am, I want to see it too.

The little princess in the queen's arms stretched out her chubby palm milkily, and the queen had no choice but to hold her higher. The mother and daughter each used one side of the telescope to look into the distance.

At this moment, the emperor's family, which ruled over 400 million people in the Yu Kingdom, was like an ordinary family of three traveling in the late autumn, happy and ordinary.

Li Leling and the other princes and princesses sat around the fireplace in the pavilion, watching this scene with a smile. The irritability and depression in my heart caused by the turmoil in the court a few days ago has subsided a lot.

That's right, Le Ling.

An older princess smiled and said, Why don't you go down and have a look? There is your Mr. Li Xiaolang over there.

What nonsense is my sister talking about?

Li Leling blushed slightly, shrunk her neck subconsciously, and carefully glanced at Emperor Yu.

After confirming that the parents didn't hear it, they smacked their lips, and took out a small telescope from their arms, looking into the distance.

I saw that in the Furong Garden, the disciples of the academy moved pieces of parts from the carriage,

Li Ang took a step forward, took a deep breath, squatted on the ground and quickly assembled it.

He connects hollow, thin, and grooved metal tubes with each other, and installs cranks, flywheels, cranksets, chains, seats, and pedals.

Soon, a strange-shaped machine was built,

It has a seat at the back, a rudder that can be held in the front, and a huge metal propeller blade connected to the top of the back.

It looks a bit like a hydraulic mill.

Mechanical structure.

Li Leling frowned slightly. In the science class, they had learned the structural principles of the hydraulic mill and seen the intricate gear sets.

The hydraulic grinding disc is to use the water flow to rotate the water wheel shaft, and the gears to rotate the milling disc to convert the circular motion in the vertical direction into the circular motion in the horizontal direction.

And that machine seems to use the chain to convert the circular motion acting on the pedals and the chainring into the circular motion of the propeller.

After the core power part was assembled, Li Ang and others started to assemble other parts.

The first is the wings. The wingspan on both sides is close to an exaggerated 30 meters. The front edge is a tubular spar, and the middle is a rib composed of light wood boards and wires. The outside is wrapped with a layer of thick paper.

At intervals, wires run from the spars to the central main column to relieve weight stress.

Behind the central main column is the propeller blade, below is the bicycle structure that acts as a cab and vertical tail, in front is a metal mast, and the other end of the mast is a smaller horizontal tail.

The entire aircraft looks like an I when viewed from above.

The students around looked at this strange aircraft and couldn't help talking about it.

Can this fly?

I understand the truth, but why is the wing so big?

The lift coefficient formula mentioned in the science class, the larger the wing area, the greater the lift coefficient