On the second day of Song Che's whim, Lu Mushroom and other weavers were invited to Hangzhou to compose

A "special R&D team" researches the fabrics needed for hot air balloons. During this period, Song Che was busy preparing other materials, such as the fuel needed for heating, the necessary firepower, and the effects of burning resistance, just right, oil refining

The "stone candle" is very much in line with this requirement, and as for the frame of the hot air balloon, Song Che drew the design drawings and found the master who made the lantern to complete it.

came and went, and before I knew it, time flickered, and it was seven days later. Lu Mushroom is worthy of ingenuity, with a group of weavers, combined with fine cotton and fiber strips to weave a special fabric that is no less than modern synthetic fibers, it is lightweight, properly breathable, and the material is tough, just suitable for hot air balloons

Lampshade. After all the materials were prepared, Song Che first imitated the style of the sky lantern, one to ten to reproduce a half-zhang size of the hot air balloon, hung a fruit basket at the bottom of the hot air balloon, loaded with five one-pound stones, and then according to the style of the sky lantern, burning stone candles to heat and inflat, in the late autumn season, the weather is cold, hot and cold contrast, obviously, soon the hot air balloon will be heated and expanded, there is an upward trend, but it is not obvious, Song Che took a stone from the fruit basket, reduce the weight of a catty, at this time the hot air balloon, Song Che saw the situation, took another stone, and then gently pushed, the hot air balloon slowly rose, flying into the sky like a sky lantern, he hurriedly wrote down various data - a stone candle as thick as a bowl, burning flames; A hot air balloon the size of half a zhang can carry three catties; Suppose an adult man weighs 120 pounds, and if he wants to carry a person into the sky in a hot air balloon, his size must be at least 40 times larger...... After a series of numerical conversions, the radius of the hot air balloon is at least between four and five zhang.

With accurate numerical statistics, it is much easier to catch up, and with the concerted efforts of all weavers, the first balloon cover will be completed in less than two days.

Song Che picked a sunny day with a beautiful wind and a slight east wind, he first tied the four corners of the hot air balloon to the eaves, and tried his best to spread it out.

The "cockpit" is a large basket with a width of several feet, the four corners of the basket are fixed at the bottom of the hot air balloon, and four sandbags are tied around it, Song Che weighs 140 kilograms, the sandbags are 40 kilograms, and the spare stone candle fuel is 30 kilograms, and the total carrying capacity is 220 kilograms.

You're all set! The wives and concubines were so worried.

"Aren't you crazy to go up in person? In case of...... What if I fall? Shen Wenjun held his big belly and didn't want Song Che to go.

This is indeed dangerous, but if you look at the world, who knows the principle of hot air balloons except him?

Of course, Song Che was not unprepared. He patted his backpack and said with a smile: "Don't worry, I have already prepared airbags and parachutes, and today is the east wind, if the hot air balloon can fly into the sky, it will slowly float to the sea, I will say hello to the Hangzhou sailors, they will escort the whole process at sea, if the balloon is really out of control, I can also save myself in time." Shen Wenjun complained in a low voice,

"The child in my belly, Wen Po said that maybe it's only been two or three days, I don't want you to have any accidents......" Song Che hesitated for two seconds, his eyes became firm, he had to give it a try no matter what today.

"Don't worry, I can do it." He didn't delay any longer and shouted, "Ignition!" "The housekeepers lit the stone candles with torches.

A large bundle of stone candles burned at the same time, and the heat wave released instantly filled the entire courtyard, about a quarter of an hour later, the heat was filled, slowly rising into the air, Song Che took a deep breath, under the gaze of the family, resolutely stepped into the basket, and ordered: "Cut the rope!" "The family cut the leash, the hot air balloon lost its restraints, and climbed into the air at a turtle speed.

Song Che thought the speed was too slow, and unloaded a sandbag, the speed increased significantly, but it was still too slow, he unloaded another one, reducing the weight by a total of twenty catties, and the speed finally reached a satisfactory level.

"Wow! Mr...... Sir, he really flew yes! ”

"I've always thought that our aunt is not a mortal, look at him, he really ascended to heaven, right?"

"Uncle, he won't really fly to the sky to be a god, will he?" Not only the people in the Song Mansion, but also the entire city of Hangzhou, the people who saw the hot air balloon all raised their heads and opened their mouths, dumbfounded.

"Hoohoo!" Song Che shouted loudly and kept waving at the people on the ground. At this time, sixty or seventy zhang had risen into the air, and the wind could be clearly felt to be stronger, Song Che hurriedly pulled down the spoiler and extinguished a stone candle to keep the hot air balloon balanced and fly overseas with the east wind.

After a while, the hot air balloon flew over the Qiantang River and off the coastline. The warship docked in the harbor saw the hot air balloon in the air and hurriedly set sail to speed up and chase the balloon's route to escort it.

"Brother Song, how are you going to come back then!" Fang Qi on the deck shouted at the top of his voice, the young man in the past is now the commander of the Hangzhou Navy.

Since there is no thruster, the hot air balloon can only be one-way, and when the fire is extinguished and the heat disappears, it will slowly land on the sea, which is why Song Che wants to let the warship escort it, so that it can be recovered in the sea later.

The role of the hot air balloon on the battlefield is high-altitude bombing, in order to prevent the strong bow and crossbow from shooting it through, the height of the climb must reach at least one hundred zhang, since the flight is flying, Song Che also wants to challenge more, so he added three stone candles, so that the firepower burns more vigorously, the hot air is more sufficient, the hot air balloon rises steadily, and the birds walk side by side, and with the increase in height, the air flow is gradually chaotic, the temperature drops suddenly, the firepower of the stone candle seems to have reached the limit, and you want to fill the hot gas again, unless you use methane and other scientific and technological fuels, in ancient times, Obviously unattainable.

Looking down at the sea from above, the warship has shrunk a lot, and this altitude cannot shoot down the hot air balloon unless there are cannons.

This flying experiment can be described as a complete success. The chaotic air flow reminded Song Che that he couldn't fly anymore, so he extinguished all the stone candles, intending to let the hot air balloon land freely, but at that time,

"Whew!" Suddenly, a strong air flow hit the face, the stone candle itself was a little fragile because it did not add protection, it was hung by the strong wind, and it was broken a few, and by coincidence, the flames flew into the balloon cover, burning a big hole on the edge of the cover!

The basket shook violently, and the sandbag hanging on the frame was accidentally blown off, and after the weight was reduced, the balance force was missing, and the strong air flow was like a pair of ruthless big hands, tearing the hole that was originally only the thickness of the bowl mouth, and the heat continued to drain, and the air pressure was instantly unbalanced......