On the shelf in the middle of the hanging basket, several gray-white stones named by Yuan Fang as foggy stones are placed in a kettle-like container, and the soft balloons are hoisted, and the opening is stretched out to align with the kettle container.

Yuan Fangzai carefully checked the safety measures, and after making sure that the rope anchor was secure, he climbed into the hanging basket with Lin Mengsheng, and then, under the gaze of everyone, pointed the water bag he carried with him at the kettle and poured out the water.

When the fog stone encounters water and produces some kind of chemical reaction, the white gas rises and pours into the balloon, as the balloon continues to expand, the hanging basket shakes, Yuan Fang holds the hanging basket tightly, his eyes are staring at the inflatable mouth and the balloon that continues to expand, when the balloon is filled with white fog, Yuan Fang seals the mouth of the pot to block the gas from continuing to pour in, but discharges the gas just generated to the outside of the balloon through another pipe, and then shouts to Sang Rou and Yuyue, who are in charge of the rope anchor: "Okay, it's almost, put it slowly." ”

Sang Rou instructed loudly: "Brother-in-law, be careful. Then, he commanded a few strong men around him to slowly let go of the rope anchor.

The balloon rose little by little, it was still a little shaky at the beginning, and it gradually stabilized after rising more than ten meters, Yuan Fang, who had a slight fear of heights, held on to the edge of the hanging basket and did not dare to move, but Lin Mengsheng didn't care at all, the probe went out and waved his hand to show off to everyone on the ground, and the hanging basket also shook again with his movements, so angry that Yuan Fang almost threw the kid out.

Under Yuan Fang's coercion, Lin Mengsheng honestly squatted in the hanging basket, his eyes were aggrieved, looking at the ground through the gap, looking angry, pitiful.

Yuan Fang cautiously looked at the probe, at this time they were already in the air more than twenty meters in the air, looked up at the balloon, and then looked at the straight rope anchor that jumped, and was overjoyed, with the fog stone, flying into the sky is no longer a dream, his air force plan can become a reality, but before that, it will take a period of time to perfect and adjust.

Tested the approximate buoyancy of the fog, today's task is considered a successful completion, when Yuan Fang was about to land, there was a little accident, the buoyancy was too great, the people below couldn't pull it at all, and the balloon also faintly showed signs of breaking free control, which made Sang Rou and them anxious, and almost all the people in the base were called over to help, but even if it didn't work, in the end, Yuan Fang thought of a way, poked a hole at the top of the balloon, the fog was eliminated through the hole, and the buoyancy gradually decayed, and the two landed safely.

Yuan Fang's legs were still trembling when he was pulled out of the hanging basket by Sang Rou and Yuyue, Yuan Fang felt that his fear of heights seemed to have become serious, so he pretended to be calm, and ran to the side to ease his nerves.

Through this test flight, many problems were exposed, such as the gondola is too shaky, such as not being able to land on its own, such as the material of the balloon is too fragile, such as only levitating and uncontrollable movement, such as the upper and lower gondola to climb into it is too inconvenient, etc.

After summarizing, Yuan Fang and Lin Mengsheng and a group of craftsmen brainstormed and came up with some solutions, the hanging basket counterweight increased stability, the bundled door was added to facilitate entry and exit, the balloon was changed to cowhide to increase the defense and set up an opening at the upper end, the opening and closing were controlled by the rope, and the fog and buoyancy in the balloon were adjusted to control the height, as for the balloon travel power, Yuan Fang's idea was to install a propeller device on the gondola and use the discarded mist to push the propeller to move, but the craftsmen here are not good at this, Yuan Fang decided to find some shipbuilding technicians to come to help, although the current ship power still relies on sails, but the reason is similar, it should not be difficult.

Speaking of the fog stone, Yuan Fang was like a treasure to this kind of stone, and after asking the craftsman who found the fog stone, he learned about the origin of the fog stone, and immediately sent someone to send a letter back to the imperial capital, so that Yang Xing could control the fog stone mining area as soon as possible, list it as an important strategic weapon resource, and strictly block the news, so as not to leak the secrets, be known by other countries, and send heavy troops to guard it.

Yuan Fang's worries were a bit redundant, after the investigation and assessment of professionals, this kind of fog stone was extremely rare, and within the scope of his knowledge, only the Fog Mountain near Yongchang County in Beizhou of the Eastern Saint Empire would be produced, and there were no such stones in other countries.

Yuan Fang stayed at the base for five days, and in the past few days, he will carry out several times a day, constantly adjusting and improving, Sang Rou, Yuyue, Wan Chunya and other women also flew into the sky in balloons, and they were excited to fly in the sky without fear of heights, and Yuan Fang sighed with envy.

After a few days of test flight statistics, the fog stone's gas production capacity is very strong, an egg-sized piece said that the fog produced is enough to carry five people into the sky and suspend for more than three hours, such a small consumption, greatly reducing the burden of fuel, in other words, can carry more items, such as oil, this is Yuan Fang's concept of aerial bombs.

What makes Yuan Fang even more pleased is that according to the craftsman who found the fog stone, the reserves of the fog stone are very huge, and there are even a lot of bare mines on the surface, and the fog stone he brought is picked up on the side of the mountain.

On the sixth day, Yuan Fang reluctantly left the base, the balloon still needs a while to perfect, but he has no time, the scientific examination is about to start, Yang Xing has sent people to urge several times, as the reformer of the scientific examination, Yuan Fang naturally became the chief examiner, and must be present to personally supervise and test the comprehensive ability of the candidates.

It took longer to return to the imperial capital than when he came, for no other reason, Guan Xiaoyun, a stingy ghost, took advantage of the farm, with two large frames of eggs, two cages of chickens and ducks, two pregnant ewes, and a lot of special products.

Guan Xiaoyun's eyes were red when he saw so many eggs and ducks in the farm, he made so many live chickens and ducks and planned to raise them by himself, so that he didn't have to go out to buy these expensive ingredients in the future, and he could also save a lot of silver, for his idea Sang Rou They snorted, and they didn't mean to help, but Yuan Fang was very supportive, and also allocated a vacant land in the backyard of the villa to Guan Xiaoyun to toss, anyway, now the project of the military hospital is not over, the engineering team is ready-made, you can ask them for help if you need a chicken coop or duck shed, As for whether these things would affect the overall appearance of the villa, Yuan Fang didn't think about it and didn't care.

The imperial capital, the villa of the military hospital, Ouyang Xianxue and Ye Qingru, who stayed behind as soon as Yuan Fanggang entered the door, greeted them, chattering excitedly, Yuan Fang understood for a while, it turned out that the sewer pipe was finally completed yesterday and put into use, Ouyang Xianxue and Ye Qingru not only took a comfortable bath yesterday, but also tried to use the flushing toilet, the effect is very good, with the sewer pipe, not only the environment is a lot more environmentally friendly but also more convenient, in the future, they no longer have to pour the toilet every day, this is their most headache work.