Lydia seemed to have remembered something and asked in surprise, "Professor Lin En, did Master Hellram ask you to come? Have I passed the test?"

"My purpose of coming here has nothing to do with Master Hellram!" Lin En rejected the girl's guess, and then, seeing the girl's disappointed expression, he spoke again. "I want to ask you to make something."

As he spoke, Lin En took out a page of parchment from his pocket and handed it over. Lydia took it and looked at it for a few seconds, and couldn't help but exclaimed.

“So beautiful…”

On the parchment scroll was a very large and strange-looking alchemical machine.

The top looks like an inverted elliptical sphere, and the bottom is connected by ropes, something like a hull. Even the internal structure is drawn very clearly. The overall framework is complicated but not messy, revealing a strange beauty.

"What is this? The latest alchemy ship?" Lydia asked in surprise. She saw propellers and rudders on it, which were only used on ships.

"It's called an airship!" Lynn replied.

At first, he actually wanted to make a hot air balloon. This was the simplest way to fly into the sky without the need for magic. But after careful consideration, he gave up this idea and simply prepared to do it in one step and directly make an airship that could travel long distances!

The purpose is of course not just to make it look good. He has already inquired about it in the past few days.

Although some third-ring wizards who are proficient in elements and plasticity can fly in the sky, the energy consumption is too high, the flying height is limited, and the speed is not fast. Only great wizards can stay in the air for a long time, and it is generally not used as a means of traveling.

The island beneath their feet was very large, with many mines. The entire wizard city was built next to a huge magic mine in the center of the island. Land transportation to various places was actually not easy.

For example, if a batch of goods is loaded on camels from the port of Yieta and travels around the mountain roads to the land of wizards, it will take seven or eight days, and there is a possibility of encountering attacks by monsters along the way.

It would be different if we started from the air, as the time could be shortened by at least half. Although the airship's carrying capacity was not large, it was still cost-effective to transport some important materials or new gadgets that were not available in the Wizard City.

In addition, the steam airship itself is also a commodity. As long as two magic crystal cannons are installed on it and some protective spells are added, it can become a mobile air fortress! It is not difficult to sell one of these things for thousands of magic gold coins.

As for the issue of technology leakage, there is no need to worry about it in the short term. As long as he can make a steam airship and fly it in the sky, he can apply to Parliament for alchemical patent protection.

Yes, in the wizarding land there is a protection mechanism for the recipes for making various magic items. Only in this way can wizards publish the results of their hard work.

In fact, in addition to alchemical items, the same is true for high-level magic. Even with his status as a professor in the academy, he can only learn some low-level magic for free.

As for the long term, there is no need to worry. What he has taken out are just low-level toys. In a few years, when he has figured out the situation in the wizarding land and directly developed an internal combustion engine, the so-called steam airship will be as slow as a snail in the sky.

"Yes, that's about what I mean." Lynn nodded.

Lydia immediately looked like she had found some treasure, with excitement flashing in her eyes. However, she soon discovered that there were no wings on the design of the airship. There was only a small propeller, and the power it provided was definitely not enough to keep the airship suspended. It should only be used to adjust its course.

"Can this thing really fly?" Lydia asked curiously. Does it require some kind of magic? "Of course it can fly." Lin En said with certainty, and then continued to ask with a smile. "Do you know why wood can float on the water?"

Lydia shook her head in confusion. Isn't it common sense that wood can float on water? Lin En explained. "Because wood of the same volume is lighter than water, that is, its density is less than water, and the weight of the water it displaces is greater than its own weight, so the buoyancy is greater than the gravity... You can try it, not only wood, but anything with the same properties can float on the water, and vice versa they will fall into the water."

"The reason why an airship can fly into the sky is the same as a piece of wood floating on the water! As long as the density of the gas in the air chamber is less than that of the normal atmosphere, then flying will not be a problem."

Lydia listened very carefully and nodded as if she understood. "So when we sit on the airship, it's just like sitting on a boat. We use this very light gas to rise into the sky, right?"

“You have a good ability to understand, but you know too little knowledge. If you could take a few more of my Olympiad math classes, maybe you could design your own aircraft!” Lin En said with emotion.

After hearing what Lin En said, Lydia's originally happy expression immediately froze, and then she looked sad. She had to join Yieta College to learn this knowledge, but the key was that she had to fly to the sky first to pass the test...

This seems like an endless cycle...

"If you can build the airship perfectly according to the design, then for the first flight, we can consider letting you fly it." Lin En said with a smile. "I remember that the agreement between you and Master Hellram was to fly in the sky without using magic, which barely meets the requirements."

"Can I really fly it?" Lydia jumped up excitedly, and then bumped her head against the wing frame. The pain made tears well up in her eyes, but she still covered her head and looked at Lynn eagerly.

"Of course, but let me be clear first, my requirements are very high!" Lin En said calmly.

Although one of his purposes this time was to trick... ahem... recruit this half-orc girl as his assistant to help him make and sell those novel creations, thus saving more time to study magic.

But the way and method of doing things is also very important. If you just go to someone's door and invite them to help you, it may arouse suspicion and will not achieve good results.

Only opportunities that are gained through one's own efforts will be cherished by others, and they will be more serious in studying Olympiad mathematics in the future.

(End of this chapter)