After he stopped, he said to Zhao Qingzhu:

"This thing is called a bicycle. It's a very convenient means of transportation. I just rode it around this yard dozens of times. Look, I'm not tired at all, in fact, I'm getting more and more relaxed. Why don't you give it a try?"

Zhao Qingzhu was naturally very interested, so Zhu Yuntong got off the carriage, helped her up, and taught her how to ride.

Zhao Qingzhu was only pedaling, but completely forgot to hold the steering wheel, which caused him to be unsteady like many beginners.

Fortunately, Zhu Yunwen was supporting her the whole time and told her not to worry about her feet, but to focus on what was in front of her, and to coordinate her hands and feet, one controlling the direction and the other controlling the speed.

Zhao Qingzhu had been learning for quite some time, and although she was still not very good at riding, with Zhu Yuntong's slight support, she was able to get up more steadily.

After all, she is an expert in martial arts, and her ability to maintain balance and adapt to changing circumstances is far superior to that of any ordinary person.

So after some instruction, she quickly grasped the essence of it and became more and more proficient in controlling the bicycle.

Later on, she didn't even need Zhu Yunwen to support her anymore.

Zhu Yuntong smiled when he saw Qingzhu riding her bicycle on her own.

It seems that the ancients could learn to ride this thing I designed, so basically, I can consider it a success.

With just a few minor improvements, it should be easy to roll out nationwide.

After riding around several times, Zhao Qingzhu stopped in front of Zhu Yuntong.

He then said to Zhu Yunwen in shock:

"This is amazing! And you only need to squeeze this thing called the brake, and the car will slowly stop, which is very safe. I really didn't expect that there were cars in this world that could move on two wheels. You are truly incredible!"

Zhu Yunwen gradually became lost in the praise, and only after regaining his senses did he smile and say:

"Our previous floral water could sell for a lot of money. How much do you think this bicycle would sell for if it were made?"

Zhao Qingzhu said, "I don't know how much it will sell for, but it will definitely make a fortune and increase the court's revenue considerably."

This stuff is way more interesting than floral water. I bet many people would buy it just for fun, because they like it, or out of personal interest.

Zhu Yunwen said, "You have overlooked the most important point: this thing is convenient for travel, and that is the key. Nowadays, the Ming Dynasty has cement roads connecting almost every place."

"This thing is so much more convenient on paved roads. Even if two counties are hundreds of miles apart, it only takes an hour to ride it."

Zhao Qingzhu strongly agreed, saying:

"When will mass production begin? I want to be the owner of this bicycle."

Zhu Yunwen: "No rush, it still needs some improvements. I'll ride this thing to show it to my grandfather first. Why don't you sit in the back?"

In Zhu Yunwen's design, a back seat was built at the back of the car, which could accommodate another person.

Zhao Qingzhu listened to Zhu Yunwen and sat sideways on the bicycle. Zhu Yunwen then rode the bicycle out of the East Palace and slowly made his way to Zhu Yuanzhang's study in the palace square.

Wherever he went, the palace maids, eunuchs, and even the guards all showed expressions of shock.

They couldn't believe their eyes. The Crown Prince and Crown Princess were actually riding on a frame supported by only two wheels, and they were moving smoothly and quickly across the square.

Isn't this like seeing a ghost?

This was something that no one could understand, so the eunuchs, maids, and guards were all dumbfounded until Zhu Yunwen was far away before they came to their senses.

Immediately, several palace maids and eunuchs began to discuss:

"Is this Crown Prince some kind of superhuman? Why is he always able to come up with things that we've never seen before, or even imagined?"

"That thing just now, how could he sit on it and carry him so far so easily? What kind of amazing thing is that?"

"I don't know either. We're not as intelligent as His Highness the Crown Prince, so how could we possibly figure out what kind of things he created?"

Another palace maid said:

"Exactly, how can our brains compare to His Highness the Crown Prince's? In short, what His Highness the Crown Prince makes is truly amazing."

…………

Along the way, Zhu Yunwen listened to the discussions of the palace maids, eunuchs, and guards, and then he arrived outside the imperial study.

From afar, Zhu Yuanzhang emerged from his study, stretching and looking for a place to cool off and have some tea.

But then he saw Zhu Yunwen riding up on his bicycle, and he immediately stared wide-eyed, then stepped forward and said:

"Yunwen, what is this thing? This thing actually brought you all here on its own? Could it be a spirit?"

Zhu Yunwen laughed heartily and said:

"Grandpa, this is a bicycle. Let me explain its workings to you, and you'll understand. It's not some kind of sentient being..."

So Zhu Yunwen explained the principles of a bicycle to Zhu Yuanzhang in detail.

He was told that by gently vibrating the pedal, the large gear would transmit power to the small gear, thus amplifying the power several times and causing the small gear to rotate.

This is somewhat similar to the lever principle. When the small gear rotates, it generates a huge force, which propels the entire bicycle carrying Zhu Yunwen forward.

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