The principle of the hot air balloon was very simple, and there were only two difficulties in making it, one was the combustion device, and the other was the airbag.
The first point was that without a pressure vessel to provide gas fuel, relying only on firewood or charcoal to heat the air was not only inefficient, but also limited by fuel, it could not fly very far. This was also the reason why the principle of the hot air balloon was discovered very early in history, but the first to be put into use in actual combat was the hydrogen balloon. So Roland simply gave up on the combustion device, and let Anna ignite the fire to heat it.
The difficulty of the airbag was its airtightness, but for Roland, who had learned from the experience of his predecessors, this problem was very easy to solve, and he just needed to use a sandwich cloth. The outer layer of the airbag was a wear-resistant canvas, the middle was lined with cow intestinal epithelium, and the inner layer was a light gauze, so that when stitched it could prevent air leakage, and at the same time, it was not afraid of the pecking of birds.
Roland opened the bottom of the airbag, and let Anna spit out a black flame with a temperature close to that of an ordinary flame. The airbag slowly swelled up, looking like a wrinkled winter melon. Considering that the hot air balloon needed to carry two people, the widest part of the airbag had a diameter of five meters, using the intestinal epithelium of twelve cows, and the stitching process took nearly a week. If he was not the lord of a territory, he might not have been able to make such a big toy.
"Does it use the buoyancy provided by the hot air to fly?" Anna asked, "I remember it mentioned in the book that hot air always rises."
"That's right, hot air rises, and cold air sinks, this is a common natural phenomenon. Using particle theory to explain it, the hot air ball's movement will intensify, and the ability to spread around will be stronger, and after the volume expands, the density will decrease. For the surrounding air that does not change, it is equivalent to it becoming lighter, so it will rise. "
After Roland finished explaining the principle, he found that except for Anna, who showed an expression of understanding, the other three were at a loss, and he could not help but secretly sigh at the importance of talent.
When the airbag completely inflated and floated up, the traction rope was slowly straightened, and Roland was the first to flip into the basket, and then he took over the climbing Anna.
"I am still a little worried," Nightingale said uneasily, "Why don't you let me go up and try it first?"
"Believe me, nothing will happen," Roland said with a relaxed smile, "And even if there is an accident, there is still Lightning."
"I will catch them, don't worry." Lightning patted her chest.
"And me!" Maggie imitated Lightning and patted her chest.
With a shake, the hot air balloon pulled the basket off the ground, and gradually climbed. Not long after, the two of them crossed the top of the castle, and the whole town appeared in front of them.
To Roland, such a scene was not unfamiliar to him. After all, he was also someone who had seen skyscrapers. However, in Anna's eyes, it was a brand new experience that was completely different from her previous perspective. She leaned against the side of the basket and looked out. She grabbed Roland's arm tightly with one hand, looking excited and nervous at the same time.
This was the first time that Roland had seen such an expression on her face. Perhaps people whose feet had never left the ground would have a slight fear of heights when they first flew into the sky.
This was the first time that Roland had seen her show such an expression. She was probably a person whose feet had never left the ground. The rope was about fifty meters long, which was the height of a fifteen-story building in the future. Roland told Anna to reduce the firepower, and the hot air balloon finally hovered in the air.
At the beginning, Lightning stayed close to the basket, but when she saw that the basket was stable, she felt relieved and began to play a game of tag with Maggie around the hot air balloon.
Looking down from here, they could clearly see the roof of the castle, the town under construction, the Redwater River flowing from west to east, and the green farmlands along the river.
"How do you feel?"
Until Anna retracted her head, Roland asked with a smile.
"Thank you for your gift," she said excitedly, "I didn't know that I could fly so high."
"You can go even higher," Roland sat down against the side wall of the rattan basket. "If the rope was longer, it would be no problem to fly ten times the distance. But the higher you go, the more complex the airflow will be, and it will be difficult to guarantee your safety. Moreover, this is only a primary aircraft. Later, when the piston machine is built, ordinary people will be able to fly faster and higher than birds, and then … "He looked up at the blue sky," People will even be able to fly out of this world and go to the boundless space. "
"…" Anna held her breath. Her eyes shone brightly as if something was about to come out of her mouth.
"I can't guarantee that we will be able to fly out of this world," Roland was amused by her appearance. "But if we can build a piston machine, so that ordinary people can fly like birds, it should be possible in my lifetime." In fact, with Anna, there was no bottleneck in the processing ability. The current shortcoming was the performance of the materials. Inferior pig iron could be used to make a steam engine, wrought iron could be used to make cannons, and steel smelted from the black fire could also be used to make a revolving gun. But if it was an internal combustion engine, it would probably need high-quality cast iron, cast steel, or aluminum. "The reason why Border Town can have its current appearance, is all thanks to you, Miss Anna."
After hearing this sentence, Anna was stunned. After a while, she sat down and softly said, "My mother died in a fire, but I not only didn't die in the smoke and fire, but also became a witch. For a long time, I thought that my awakening had caused the fire, and I was extremely disgusted with myself as a witch. When I was locked in prison, I thought that I might be able to usher in freedom, but you rescued me from the prison and taught me how to use my ability … I didn't expect that in addition to burning and pain, flames could also have so many uses. " Anna paused, "Being able to meet you, I should feel extremely satisfied, but now I find that my thinking has changed. Sometimes I feel suffocated and uncomfortable, and I hope to get more."
She climbed onto Roland's shoulder, "Even so, do you still want to hire me?"
Her lake blue eyes sparkled, and her breath blew on his face, making him feel a little ticklish. Separated by thin clothes, he could feel her soft body and her thumping heartbeat. Even so, she didn't avoid his eyes. When there was no Nightingale, she was always full of enthusiasm and initiative.
"There is …"
Before Roland could finish his words, Anna had already sealed his lips.
After separating, he gently gasped, "I want to hire you, always. Miss Anna. "
"Yes."
This time, he took the initiative to lower his head, and pressed his body against hers.
…
"Hey, wait," Maggie chased after Lightning for a while, suddenly stopped in the air, and looked at the empty basket, "They're gone, coo!"
"Ah?" Lightning tilted her head and glanced at them. "They just sat down."
"Won't you not be able to see the scenery outside?"
"The scenery can be seen at any time, but there are not many opportunities like this."
"Opportunities?" Maggie shook her wings, and landed on Lightning's shoulder, "I don't quite understand, coo, do you want to go see them coo?"
"No way," Lightning hugged the pigeon, "This is a sacred ceremony, it can't be interrupted."
"Coo?"
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