In a luxurious villa in the royal capital of [Hadratha], Lin En was lying on a comfortable table and chair, receiving meticulous care from the wizards of the academy.

In the last battle to defend the capital, Lin En forcibly mobilized all the computing power of the magic network to cast the Eternal Flame and laser magic. The severe backlash afterwards almost caused him to have brain death.

Although he was rescued after drinking two legendary potions in succession, he was unable to cast magic at will for a short period of time.

This scared Alok and the others a lot. After all, Lin En, the magic star, was the pillar of the entire school and could not afford any mistakes! After Lin En repeatedly assured him that he was in good condition and just needed to rest, the wizards of the academy were still very worried. They found a lot of precious potions that could restore mental damage and increase vitality for him, and a master who was proficient in herbal medicine had a strict recuperation plan - in general, he had to eat well, drink more, and not do anything!

In addition, hundreds of wizards and a whole new army equipped with percussion rifles were arranged to be responsible for the security of the manor, for fear that an enemy would sneak in at this time and kill this "powerless" magic star.

Johnny, who was familiar with Lin En. Lydia, Elroc and others were sent to take care of Lin En's daily life and provide close protection. According to Orlando, this was the top priority of the school at the moment! Orlando and others' overly stressful arrangements made Lin En feel helpless. He just couldn't use his magic power at will for the time being, and he was not a useless person. Even when he was at his weakest, he could still knock out a dozen brainwashed guards with his fists...

But it must be said that this kind of life of having everything provided for him is very comfortable. Even if he is not a useless person, he feels like he is about to become one.

"Master Dean, this is purple fruit. King Hattar sent it here. I tried it for you. It's not poisonous and tastes great!"

Beside him, Lydia picked up a peeled purple fruit and put it into Lin En's mouth. Then she began to pinch his thigh very attentively. However, her strength was so great that Lin En gritted his teeth in pain.

"Alright, alright, let go!" Lin En slapped the half-orc girl's hand away helplessly. If she continued to pinch like this, he would lose his legs!

Lydia shrank her neck, looking pitiful like a little animal that had done something wrong.

"Tell me, what do you want to talk to me about?" Lin En shook his head and asked.

Although Lydia was one of the people assigned to take care of his daily life, she had been slacking off these days, secretly tinkering with some strange things. She was suddenly so attentive today, there must be something wrong.

"I drew a blueprint and would like you to take a look at it for me..." Lydia hurriedly took out a design from her arms and unfolded it in front of Lin En.

The drawing showed a very rough and crude-looking aircraft, which was very similar in style to the one he saw when he first came to Yieta Harbor, but it could be seen that many adjustments had been made to the details.

Lydia stared at Lin En nervously. Although the appearance of the airship satisfied her dream of flying into the sky, it was the masterpiece of the dean after all. Over the past year, Lydia has not given up the idea of ​​making her own aircraft.

And she remembered that Lin En had said that there was nothing wrong with her design concept. The biggest reason why the aircraft she made was difficult to take off into the sky was that it lacked power! The emergence of the internal combustion engine obviously made up for this and made the improvement of the aircraft possible.

In her imagination, although this aircraft could not transport troops and weapons and ammunition like an airship, it had the advantage of being faster and lighter. With a machine gun or beam weapon installed in the front, it could fight the Griffin Knights head-on in the air...

"Can it fly?" Lydia asked impatiently.

“There’s no problem flying this time…” Lin En said thoughtfully, but before Lydia could jump up excitedly, he spoke again.

"But if you want to reach a speed of 200 kilometers per hour at full power as you expected, it is impossible. The shape of this aircraft is still lacking. It cannot effectively resist wind resistance. The materials are also not up to standard. It will definitely fall apart when driving at high speed!"

"Didn't I give you an introductory notebook on aerodynamics before? How much have you read?" Lynn asked back.

When Lydia heard the word "aerodynamics", her face suddenly became confused. That thing was too difficult to understand and it was simply not something that a human could learn!

Before reading this note, Lydia always believed that she had an extraordinary talent in Olympiad mathematics. She could quickly master equations, exponents, and geometry, and even understand part of calculus. However, aerodynamics left her confused. It was hard to imagine that this was just the basics.

Seeing the troubled look on the halfling girl's brow, Lynn guessed that Lydia had not learned it.

Of course, this is normal. Aerodynamics is a branch of fluid mechanics, and the amount of knowledge and calculation involved is very huge. Even until modern times, some difficult problems about fluid mechanics have not been solved.

It was not until the 22nd century that relatively accurate predictions and calculations were achieved thanks to the rapid advancement of the computing power of quantum computers.

The notebook that Lin En gave to Lydia was naturally very old, based on classical mechanics. Unexpectedly, it was still too difficult! "You can compare the air to the sea, and your aircraft is the fish swimming in the sea. Their body shape is to better resist the resistance of the sea water. This is also reflected in birds. I call it streamlined..." Lin En used his hand as a pen and magic as ink to slightly modify the drawings while explaining it to Lydia.

Lydia watched Lin En writing and drawing on the drawing. In just five minutes, all the details had been fine-tuned.

The frame is still the same frame, but it looks much more beautiful, with an indescribable beauty...

Lin En didn't know what Lydia was thinking, otherwise she would definitely tell her that beauty itself is power!

Powerful war machines usually look very good and domineering, because that is the design that best fits nature...

(End of this chapter)