Release that Witch

The principle of hot air balloon is very simple. There are only two difficulties in making it. One is the burning device, and the other is the airbag.

The first point is that without the pressure vessel providing gaseous fuel, firewood or charcoal alone can be used to heat the air. The efficiency is low, and it is not far from the fuel limit. This is also the principle of hot air balloon discovery in history, but the reason for the first use in the actual combat is the hydrogen balloon. So Roland simply gave up the burning device and let Anna heat the ignition.

The difficulty of the airbag is the airtightness, but for Roland, who has borrowed the experience of the predecessors, this problem can be easily solved by using the laminated fabric. The outermost layer of the airbag is a wear-resistant canvas with a cow's intestine film in the middle and a light gauze on the inner layer, so that it can be sealed to prevent air leakage and not afraid of bird sniping.

Roland opened the bottom of the airbag and let Anna spray a black fire with a temperature close to the normal flame. The airbag slowly swelled up and looked like a wrinkled winter melon. Considering that the hot air balloon needs to be lifted by two people, the outer diameter of the airbag is five meters in diameter, and the intestinal membrane of twelve cattle is used, and the sewing work is close to one week. If it is not the lord of the jurisdiction, it does not necessarily make such a big toy.

“Does it fly with the buoyancy provided by the hot air?” Anna asked. “I remember in the book that the hot air is always rising.”

“Yes, hot air rises, and cold air sinks is a common natural phenomenon. Using particle theory to explain, the hotter air ball is intensified, and the ability to diffuse around is strong, and the density will become smaller after volume expansion. For air that has no change around, it is equivalent to lightening, so it will rise."

After speaking about the principle, Roland found that except for Anna’s expression, the other three were all stunned, and he could not help but secretly sigh the importance of talent.

When the airbag was fully inflated and floated upwards, the traction rope was slowly straightened, and Roland first turned into the basket and then took over Anna who was climbing.

"I still have some concerns," said the nightingale. "If you want me to go up and try it."

"Trust me, nothing will happen," Roland smiled easily. "And even if there is an accident, there is lightning."

"I will catch them, rest assured." Lightning patted the chest.

"And I am!" McGonagall learned how to shoot with lightning.

With a sway, the hot air balloon took the gondola off the ground and gradually climbed up. Not long after, the two crossed the top of the castle, and the whole picture of the town was presented to them.

For Roland, this scene is not unfamiliar. After all, he is also a person who has seen the skyscraper, but in Anna's eyes, it is a new experience that is completely different from the previous perspective. She squatted on the side of the basket and looked out, and one hand firmly grasped Roland's arm, which seemed exciting and tense.

This is the first time Roland has seen her revealing such a look. People who have never left their feet with their feet will have a slight fear of height when they first fly to the sky.

Soon, the hemp rope under the basket used to hold the hot air balloon was pulled to the limit and the rise stopped. The hemp rope is about 50 meters long, which is the height of the 15th and 6th floors of the later generation. Roland let Anna reduce the firepower, and the hot air balloon finally hovered in the air.

At the beginning of the lightning, I kept the basket on the side of the basket. After seeing the basket stable, I was relieved to play the chase game with the wheat balloon around the hot air balloon.

Looking down from here, you can clearly see the roof of the castle, the town where construction is everywhere, the Chishui River flowing from the west to the east, and the verdant farmland along the river.

"how are you feeling?"

It wasn't until Anna retracted her head that Roland asked with a smile.

"Thank you for your present," she said excitedly. "I can fly so high."

“It can be even higher,” Roland sat down against the side wall of the rattan basket. “If the hemp rope below is longer, flying ten times this distance is fine, but the more complicated the airflow, the more complicated it is. Sex is hard to protect. And this is just a junior aircraft. After the piston machine is built, ordinary people can fly faster than birds, higher than birds, and then back..." He looked up at the blue Sky, "People can even fly out of the world and travel to boundless space."

"..." Anna held her breath, her eyes sparkling, and something came out.

"I can't guarantee to fly out of the world," Roland laughed at her appearance. "But it made a piston machine that allowed ordinary people to fly like birds. It should still be possible in the rest of life." In fact, Anna is here. There is no bottleneck in processing capability, and the current short board exists in material properties. Inferior pig iron can make a steam engine, wrought iron can be used for guns, and steel wheel runners smelted with black fire are not a problem, but if you use an internal combustion engine, you may need high-quality cast iron, cast steel or aluminum. "Bianzi Town can have the present look, all this is your credit, Miss Anna."

After hearing this sentence, Anna stunned. After a while, she just sat down and whispered. "My mother died in a fire, but I was not only buried in smoke and fire, but became a witch. For a long time, I I thought it was my awakening that led to this fire, and I was extremely disgusted with being a witch. When I was in jail, I thought I might be able to liberate, but you saved me from prison and taught How do I use my ability... I didn't think that the flame can have so many uses besides burning and suffering.” Anna paused. “I can feel met if I can meet you, but now I find out. My own thoughts have changed. Sometimes I feel uncomfortable in my heart and hope to get more."

She climbed onto Roland's shoulder. "Even if you want to hire me?"

Her blue eyes sparkled, her breath blowing on her face, and it felt a little itchy. Through a thin piece of clothing, he can feel the soft body and the heartbeat of the other side. In spite of this, she did not avoid the gaze of direct vision. When there was no nightingale, she was always full of enthusiasm and initiative.

"There is outside..."

Roland has not finished, Anna has sealed his lips.

After he separated, he gasped. "I want to hire you, always. Miss Anna."

"Ok."

This time, he took the initiative to bow his head and put it with her.

......

"Oh, wait," Mai said after catching the lightning for a while, suddenly stopped in the air and looked at the empty hanging basket. "They are gone!"

"Ah?" Lightning looked at him. "They just sat down."

"Do you not see the scenery outside?"

“The scenery can be seen at any time, but there are not many opportunities like this.”

"Opportunity?" Mai Hao twitched his wings and landed on the shoulders of lightning. "I don't understand very well, do you want to see them?"

"That can't be done," Lightning grabbed the pigeon. "This is a sacred ritual that cannot be interrupted."

“Hey?”

"In short, you will understand later, this time, as long as you don't see it, this is what my dad's greatest explorer told me." Lightning throws wheat stubble, akimbo, "Run now, Change me to chase you!" (To be continued. If you like this work, you are welcome to come to the starting point, your support is my biggest motivation. Mobile users please read.)