When the hanging blue rose to about five meters, Song Zhe gave an order, and the three warriors began to throw sandbags downward, one bag of one hundred catties, these are all nine-grade martial artists, one bag in one hand is very easy, six bags can be thrown down in one breath, a ton of sand sounds a lot, in fact, only twenty bags are used, and most of them are thrown down in a blink of an eye.

As the ballast sandbags were thrown down, the people on the ground could clearly feel that the hot air balloon was much lighter, and the eight thick vines were immediately taut, making a 'squeak' sound.

Renault glanced at Song Zhe, who nodded and said, "Ready." ”

Song Zhe has practiced this set of lift-off procedures several times, and he has already practiced it.

"Open the anchoring cable and prepare for liftoff. Renault said, dozens of warriors rushed to the edge of the thick vine, a group of five, and with the joint force, opened the thick vine that fixed the hot air balloon.

There is no thick rattan fixed, the hot air balloon is like a wild horse, quickly lifted into the air, in a blink of an eye, it has risen hundreds of meters high, the warrior on the hanging blue according to the operation process, the remaining sandbags are thrown down, the two warriors sit in the operation position, hold the handle with both hands to borrow strength, the legs step hard, the chain rotates rapidly, and the huge propeller at the tail of the hanging blue slowly rotates.

The shape of the hot air balloon determines its nature, and this game cannot fly fast at all, and the slightest wind can blow it away. The propeller thrusters installed on it can only be used to adjust the direction and temporarily use the power output when there is no wind.

Don't look at it as a small hot air balloon, according to Renault's design, the full load can reach two and a half tons, plus hundreds of pounds of dead weight, if you want to rely on a set of propellers to accelerate, half the effort, this is purely an experiment.

Today's weather is good, sunny and breezy, the first lift-off, in the end there is still something wrong, all the sandbags in the ballast are removed, the weight of the hot air balloon is not enough, Song Zhe reacted a little slower, before he adjusted the firepower, the hot air balloon has risen to a height of more than three thousand meters, this height is actually nothing, but for the hot air balloon designed by Renault, there is already a certain danger.

As Song Zhe closed the flamethrower, the air heat decreased, the hot air balloon began to descend rapidly, and the heat preservation and airtightness of the silk were worse than Renault expected.

Seeing that the speed of descent was too fast, Song Zhe hurriedly lit the fire again and heated it, but the hot air balloon was like a monkey, scurrying up and down, and it took Song Zhe half an hour to adjust the firepower and let the hot air balloon suspend at a height of about a thousand meters.

Several Jiupin martial artists let out a sigh of relief, they were frightened just now, when the hot air balloon went up, it was okay to say, the weightlessness when descending rapidly, not to mention the Da Chu people who had never experienced it, even the earthlings would feel quite exciting, otherwise there would not be so many people who spent money to play jumping machines and parachuting.

Wait for the people in the hanging blue to adapt, then they are in the mood to enjoy the scenery outside, Song Zhe is okay, as an earth immortal, he can fly by himself, and he has seen the rainforest from the air many times, and he will not feel how amazing, but for these warriors who can only walk in the rainforest and can't see the sun when they look up, this feeling is too amazing.

Song Zhe was not in a hurry, and waited for them to watch for a quarter of an hour before giving the order to turn, the helmsman controlled the helmsman, changed the direction of the propeller, the two warriors provided the power, Song Zhe found the right wind direction, and the hot air balloon flew farther and farther along the air current.

Song Zhe's heart is very big, originally said that the first test flight, stay in the air for an hour, practice landing for half an hour, but Song Zhe found that as long as you adapt to the ratio of the size of the firepower to the height of the hot air balloon, this game is very easy to control.

As an earth immortal, he is still quite sensitive to the air currents in the air, and he found that as long as he found the right air current, he could fly in the direction he wanted to go at a very fast speed without the help of a martial artist.

Everyone was worried on the ground, watching the hot air balloon go up and down for half an hour, and finally saw the hot air balloon stabilize, thinking that Song Zhe would control it to descend and prepare to practice landing, but the hot air balloon flew farther and farther, and after half an hour, there was no trace of it.

Renault shook his head and smiled bitterly, the human dream of flying, even Song Zhe, the earth immortal, is not exempt from vulgarity, don't look at his own ability to fly, he can control the flight of the hot air balloon, those are completely two feelings, this old man Song is having fun, I am afraid that he will not come back in a short time.

Theoretically, as long as there is enough fuel in the hot air balloon, the game can always float in the sky, and the fuel to keep it floating in the air is not too much. The test flight will naturally not be fully loaded, only one hundred catties of flowing balsam are prepared on it, but this play is quite resistant to burning, as long as Song Zhe does not use it indiscriminately, this hundred catties is enough for him to float in the sky for several days.

Forget it, let him play, anyway, with Song Zhe's ability, even if he plays badly, he will not be in danger. A hot air balloon is not like an airplane, even if something goes wrong, there is enough reaction time, not to mention Song Zhe himself, even those few martial artists, as long as Song Zhe does not panic, he has enough time to rescue them to the ground.

Back in the cave, Renault took pen and paper: a compass, a telescope.

The compass is the simplest, the telescope can also be considered, and when he was in Dingjun City, Renault bought a large number of translucent stones, which may not be as good as glass, at least they can be used. As long as you take the time to grind out the lenses, you can make a usable telescope.

Dynamical system!

This is the most difficult thing, whether it is materials, processing technology, fuel, Renault feels that it is difficult to solve for the time being.

Whether it is for transportation or for combat, the hot air balloon is not a good choice, its handling is too poor, and the airship is different in appearance, the biggest difference is in the thrusters.

On the hot air balloon that Song Zhe flew away, it was said to be a thruster, but in fact, the propeller could only play a steering role, and the flight relied on the wind.

If the airship does not have enough power thrusters, it is not as good as a hot air balloon, and the airship does not have any advantage in the use of wind power.

Not to mention Zeppelin's kind of behemoth, even if it is a small airship, if it wants to be pushed by manpower, it is too difficult to make the airship move while fighting against the natural wind, unless all the output sources are replaced with grandmasters, and the number must not be less, it is simply impossible.

Not to mention that there are not so many grandmasters, even if there are, Renault is reluctant.

Ion thrusters and other equipment, Renault must not be able to build, the simple principle of the internal combustion engine, Renault naturally knows, the difference is only in the degree of fineness, sixteen, eighteen, twenty cylinders have no hope, the easiest two-cylinder four-stroke, Renault feels that he draws a design drawing or something, and then let the God of Wealth analyze, the probability of success is still high.

But can you design it yourself, can the fifth-level fitter in Zhangtan make it? Renault feels really unreliable, it will take ten or eight years, maybe it is possible, but Renault can't wait for that time.

Why don't you add a few spinner sails to the airship?

The universal sail is quite pitiful, the ancestors of the human race on the earth have long learned to sail with the help of the wind, soft sails, hard sails, main sails, auxiliary sails, spinnakers, there are many types, and the effect is okay.

It was only after the sail was withdrawn from the stage of history that human beings invented the universal sail, which can be used by the wind no matter which direction the wind comes from.

It's a pity that it was invented too late, and by the time it reaches the level of usability, jet planes, nuclear-powered aircraft carriers are running all over the world, and who still uses universal sails?

Think about adding a row of universal sails to the airship, that image, there is no one left.

When Renault was engaged in invention and creation, he always used the reminiscence style, and he felt that human history can best prove the practicability and reliability of an invention.

But the universal sail is different, its appearance is obviously lagging behind, that is, adding a universal sail to the airship and driving the propeller with the help of the wind is not necessarily impossible, but it looks a little weird.

Appearance or something, who cares, Renault is a standard practical idea, as long as it is easy to use, it doesn't matter if it is made like an alien monster.

Thinking of this, Renault quickly drew a universal sail, which is actually very simple and does not have any technical difficulties.

A spindle in the middle, from the main shaft radiates four fan blades with a radian, no matter which direction the wind blows, it will blow one of the fan blades and move with the universal sail.

Below the spindle, there is a set of gears, which turn the rotational force of the spindle into power through the transmission device, and finally connect to one or more propeller propellers, which rotate rapidly to propel the airship forward.

Renault only took a minute to draw the universal sail, marked out the size of the dumbfounded, the size of the universal sail can not be small, the small fan blade area is not enough, the power is insufficient, but the size is big, it needs to have enough strength of the material, the strength of the material is enough, the weight is ......

Crumpled the drawn pattern into a ball and threw it on the ground, it seems that this matter is still in a hurry, the speed of the hot air balloon is a little slower, at least the manufacturing and materials are not a problem, as long as the number is enough, it is still very easy to use.

Renault stayed in Tianyun Valley for more than 20 days, and it was not until the news came from the convoy that only the last packer of silk was left, and he had to regretfully stop.

At this time, fifteen hot air balloons had already flown in the sky above Tianyun Mountain. When Renault arrived here, he didn't even leave Tianyun Valley, but he had already shocked all the toasts within a radius of thousands of miles.

Who has ever seen a monster flying in the sky?

This time, all the toasts have seen it, in order to train the hot air balloon operators, produce one, and immediately take off, as long as it is daytime, people can rest, hot air balloons will never be idle, just like when the plane was first produced, Renault needs a large number of hot air balloon pilots.

Nanzhang natives, who have ever seen this kind of thing, the toast is better, although there is fear on his face, but he can't say it, those natives just kneel on the ground and keep kowtowing, if the hot air balloon doesn't fly away, they can kowtow all day.

Now Tianyun Mountain Bitang Cave is famous, since ten days ago, all over the country, no matter how big or small, including that Tong Mancang, have personally brought heavy gifts, rushed to Tianyun Mountain, with a trace of pilgrimage, ready to meet Lanyun Creek.

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