Otaku Engineer in Great Tang Dynasty Chapter 973: An encounter in Dongshi!

Actually, this bike is really not easy to ride, not as good as the modern little yellow bike!

Because the pedals of this car are directly placed on the axis of the front wheels, the power of the car is mainly transmitted by the crank rocker linked with the pedals. When the pedals make a revolution, the front wheels also rotate. Circle, in this case, it is too difficult to make the car faster!

If Li Zexuan hadn't had martial arts, he would have been tired of riding from Yunshan to Chang'an alone. How could there be more energy to carry Lan'er around?

Modern bicycles are driven by chains, and there is a larger transmission ratio between the front and rear gears. Under normal circumstances, a pedal rotation will drive the rear wheel to rotate several times. The so-called variable speed bicycle is A flywheel is added to the rear wheel, which is a gear that can change the number of teeth.

Y represents the gear ratio, C represents the number of teeth of the driving gear, and n represents the number of teeth of the driven gear. The relationship between them is expressed by a formula, that is, Y=c/n. For example, the wheel disc of a certain car has 48 teeth, and the flywheel is With 16 teeth, the gear ratio can be calculated by substituting the formula into 3. That is to say, pedal the roulette for one week and the flywheel for three times, which means that the rear wheels rotate for three times.

Although increasing the gear ratio can speed up the bicycle, don’t ignore it. The chain drive in this case is a laborious lever. The greater the gear ratio, the more laborious the pedaling. Based on this comprehensive consideration, in actual situations Regardless of the model of the bicycle side, the gear ratio is about 2-4.

The gear-shift car adjusts gears by changing the gear ratio to adjust the transmission ratio, so as to save effort or increase speed.

Another problem is the rotating parts of various parts of the bicycle body. The only thing the workshop can do now is roller bearings. Ball bearings are still not available. The rollers also caused the bicycle in Li Zexuan's hand to run jerky, the handlebars were not flexible, and the wheel's rolling friction kinetic energy was lost. This makes this thing harder to ride.

"Brother! Look! Look! Isn't that Sister Changle and Brother Prince?"

When riding to Dongshikou, Lan'er suddenly cried out excitedly.

"哧~!"

Li Zexuan heard Lan'er's voice and quickly squeezed the brakes. A hoarse rubbing sound rang through the street, and the bicycle stopped immediately.

"Ouch~!"

Due to inertia, Lan'er's head hit Li Zexuan's back suddenly, and the little girl couldn't help letting out an exclamation.

"Cheng Qian? Where is it?"

Li Zexuan supported the bicycle with his right foot, turned his head and asked.

"Huh! Brother smelly, don't talk to Lan'er when parking!"

Lan'er rubbed her head, flattened her mouth.

Of course, the little girl is definitely not really angry. After she complained about Li Zexuan, she said: "No, that's not the prince brother and... hey! Brother, they are coming to our side!"

In fact, without her, Li Zexuan has also found Li Chengqian and Changle among the crowd. The siblings were followed by two guards. The guards were still holding several brocade boxes in their hands. Presumably they should have gone out of the palace to go shopping and just finished shopping.

The previous hoarse brake sound instantly attracted the attention of the two brothers and sisters. When they saw Li Zexuan and Lan'er here, they leaned over here.

"Ah! Brother Xiaoxuan! What kind of car are you pushing~?"

Changle ran all the way, looking at the bicycle beside Li Zexuan in surprise, said.

"Yes! Xiaoxuan! Why have I never seen this kind of car?"

Li Chengqian also walked up to Li Zexuan at this time. Seeing Lan'er sitting in the oddly shaped car, he felt surprised in his heart and couldn't help asking.

"The prince brother is really stupid! This car is called a bicycle. It can run on its own, and it runs fast!"

Seeing that both Li Chengqian and Changle have never seen the world before, Lan'er suddenly felt a deep sense of superiority. She couldn't help but said: "A-niang said that the prince's brother and Changle's sister were born in the royal family, and their identities are distinguished. But now it seems that the royal family is not as good as ours!"

The little girl’s thoughts are always so simple and innocent. Her family has bicycles but the royal family does not. Obviously her family is better than the royal family!

"Hehe! That's right! This is the bike! The workshop just made it, it's normal that you haven't seen it before Cheng Qian!"

Li Zexuan held the bicycle with one hand, patted Lan'er's head with the other, said.

"Bike? This car can really walk on its own?"

Li Chengqian looked at the bicycle carefully, a little disbelief.

He always felt that this kind of car would fall to the ground as soon as a person let go. How could it be possible to walk by himself?

Actually, this is not to blame for his short-sightedness. The main reason is that ancient people often saw horse-drawn carriages. They have formed a mindset. The bicycle has only two wheels, and the two wheels are arranged in tandem. The carriage looked more stable~IndoMTL.com~ Before Li Zexuan could speak, Lan Er couldn't help but retort: ​​"Why can't it! Just now Lan Er and her brother came here on this cart!"

Changle covered his mouth and smiled: "Sister Lan'er, it should be the bike that Xiaoxuan elder brother ridden. Are you in the bike?"

Lan'er's face is not red or heartbeat, and said: "Yeah! I just want to express this. Sister Changle, you are really understanding!"

This girl's mouth is sweet and can be bored, and Changle is irritated by the sweet heart, "Ha ha! Lan'er, how does it feel to sit on this bicycle?"

Lan Er tilted her head up, thought for a moment, and said: "Well! It's quite comfortable... It's just a bit cold!"

To be reasonable, bicycles are indeed faster than horse-drawn carriages, but this thing is definitely not as warm as horse-drawn carriages.

This was a somewhat cute and clever answer, which immediately amused everyone.

"Sister Changle, would you like to try it too? It's really comfortable~?"

Lan'er saw everyone laughing, and thought they didn't believe what she said, so she said again.

Chang Le's eyes immediately flashed a touch of emotion, Li Chengqian glanced at Chang Le inadvertently, his heart suddenly shook, and hurriedly said: "Ahem! Changle, it's not too early, Father, If they don’t see you for a long time, they should be anxious!"

As the elder brother, Li Chengqian has actually discovered that Changle’s feelings for Li Zexuan are different. He can’t tell whether it is the attachment to the eldest brother or the feelings between men and women. However, Changle is not suitable to follow. Li Zexuan walked too close. As for things like sharing a car, it is even more impossible!

"Hmm~! Then, brother Xiaoxuan and sister Laner, goodbye~!"

Chang Le shook his thin lips and said softly.

She in a pink palace dress looks even more pitiful in the sunset