Release that Witch Chapter 175: Hot air balloon trip

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 air bag.

The first point is that situation, which does not provide gaseous fuel in a pressure vessel, uses wood fire or charcoal to heat the air. It is not efficient, and it cannot fly far due to fuel restrictions. This is also the reason why the hot-air balloon principle was discovered long ago in history, but it was hot air balloon that was the first to be used in actual combat. So Roland simply gave up the combustion device and let Anna fire and heat.

The difficulty of air bag lies in hermeticity, but for Roland, which has learned from previous experience, this problem can be easily solved by using sandwich fabrics. The outermost layer of air bag is a wear-resistant canvas, the middle is lined with cow gut membrane, and the inner layer is light gauze, so that it can be stitched together to prevent air leakage and not afraid of bird pecking.

Roland propped up the bottom of air bag and let Anna spray black fire with a temperature close to ordinary flames. air bag swelled slowly, looking like a wrinkled winter melon. Considering that the hot air balloon needs to be carried by two people, the diameter of the air bag is five meters at its widest point. Twelve cattle's intestinal membranes have been used, and the sewing work is nearly a week. If it weren't for feudal lord, which ruled a place, it wouldn't necessarily make such a big toy.

"Does it fly with the buoyancy provided by hot air?" Anna asked, "I remember that the book mentioned that hot air always goes up."

"Yes, hot air rises and cold air sinks are common natural phenomena. Explained by particle theory, the hot air spheres intensify their movement, have a strong ability to diffuse to the surroundings, and the density will increase after volume expansion Smaller. For the air that has n’t changed around, it ’s equivalent to lighter, so it will rise. "

Roland After speaking the principles, he found that in addition to Anna's expression of So that's it, the other three were bewildered, making him secretly sigh the talented importance.

When the air bag is fully inflated and floats upward, the traction rope is slowly straightened, and Roland is the first to be turned into the gondola, and then takes over the Anna during the overturn.

"I'm still a bit worried," Nightingale said uneasily, "or you can let me go up and try it first."

"Trust me, nothing will happen," Roland smiled easily, "and even if there is an accident, Lightning is still there."

"I will catch them, rest assured." Lightning patted his breasts.

"me too goo!" Macy patted his chest with the look of Lightning.

With a shake, the hot air balloon took the gondola off the ground and gradually climbed upward. It didn't take long for them to get over the top of the castle, and one by one of small town appeared in front of them.

To Roland, this kind of scene is not unfamiliar. After all, he is also a person who has seen skyscrapers, but in the eyes of Anna, it is a completely new experience with a completely different perspective. She lay on the edge of the hanging basket and looked out, holding one arm firmly in Roland's arm, looking excited and nervous.

This is the first time that Roland has seen her look like this. Probably someone whose feet have never been far away from the ground. When flying to the sky for the first time, they will have a slight sense of heights.

A short while later, the twine under the gondola used to tie the hot-air balloon was pulled to the limit and the ascent stopped. The hemp rope is about fifty meters long, which is the height of fifteen or sixty stories in future generations. Roland reduced the firepower of Anna, and the hot air balloon eventually hovered in the air.

Lightning was still at the side of the hanging basket at the beginning. When he saw that the basket was stable, he felt relieved and played a chasing game with Macy around the hot air balloon.

When looking down from here, you can clearly see the castle roof, small town under construction everywhere, Scarlet Water River flowing from west to east, and green farmland by the river.

"How do you feel?"

Roland asked with a smile until Anna retracted his head.

"Thank you for the gift," she said excitedly, "I could fly so high."

"It can be higher," Roland sat down against the side wall of the rattan gondola. "If the hemp rope below is longer, flying a distance ten times that is fine, but the higher the airflow, the more It ’s complicated, and security is difficult to guarantee. And this is just a basic aircraft. After the piston machine is built in the future, ordinary people will be able to fly faster than birds, higher than birds, and then ... ”He looked up. With blue eyes, "people can even fly out of this world into boundless space."

"..." Anna held her breath, her eyes sparkled, and something was coming out.

"I ca n’t promise to fly out of the world," Roland laughed at her appearance. "But the piston machine was built so that ordinary people can fly like birds. It should still be possible in life." With Anna, there is no bottleneck in processing capacity, and the current short board exists in material properties. Inferior pig iron can make steam engine, wrought iron can make guns, and the steel revolver smelted with black fire is not a big problem, but for internal combustion engines, high-quality qualitative cast iron, cast steel or aluminum may be needed. "Border Town can look like it is now. It's all your credit, Miss Anna."

After hearing this sentence, Anna froze. After a while, she came to sit and said softly, "My mother died in a fire, but instead of being buried in smoke and fire, I became witch. For a long time, I I thought it was my awakening that caused the fire, and I hated myself as witch. When I was in prison, I thought that this might lead to liberation, but you saved me from prison and taught me How do I use my power ... I didn't expect that flames could be so useful in addition to incineration and suffering. "Anna paused," I should be very satisfied to meet you, but now I find myself thinking It ’s changed, sometimes I feel uncomfortable in my heart, hoping for more. "

She climbed over Roland's shoulder. "Even so, do you still want to hire me?"

Her sparkling blue eyes, her breath was blowing on her face, and it felt a little itchy. Through thin clothing, he could feel each other's soft body and banging heartbeat. Despite this, she did not avoid her gaze. When there was no Nightingale, she was always full of enthusiasm and initiative.

"There is ..."

Roland hasn't finished speaking yet, Anna has sealed his lips.

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

"Yeah."

This time, he actively lowered his head and hugged her.

...

"Well, wait," Macy chased Lightning for a while, and suddenly stopped in the air, looking at the empty hanging basket, "They're gone!"

"Ah?" Lightning glanced up, "They just sat down."

"Will you not see the scenery outside then?"

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

"Opportunity?" Macy shook his wings and landed on the shoulder of Lightning. "Don't understand very well, would you like to see them?"

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

"Goo?"

"In short, you will understand in the future. At this time, as long as you do n’t see it, this is what my dad ’s greatest explorer told me." Lightning throws Macy, akimbo, "Run now, change me I'm chasing you! "(To be continued. If you like this work, you are welcome to start casting, and your support is my biggest motivation. Mobile phone users please read.)