Of course, because Anna's temperature control ability can only be achieved within a certain range, it is still necessary to use fire oil to heat the airbag, and Su Fei is considering the direction of controlling the hot air balloon. Pen & Fun & Pavilion www.biquge.info

The hot air balloon does not have a power device, it just has an air bag that can support the basket and the people in it to float in the air, and in general, there are several ways to control the direction of the hot air balloon.

The first is of course to rely on the wind, which way the wind blows, the hot air balloon will float to which side, because at different altitudes in the air, the direction of the wind is different, experienced people can change the direction of flight by controlling the height of the hot air balloon flight, so the general hot air balloon will be accompanied by a rapid rise and fall in height when changing the direction of navigation.

The second method is actually an auxiliary method, that is, the sandbags hanging around the basket of the hot air balloon, at the beginning the weight of the sandbags on all sides is balanced, when you want to go to which side, take off the sandbags in the opposite direction and hang them on the basket hook in the forward direction, so that the hot air balloon has a tendency to tilt, the overall center of gravity will change, and then realize the steering in the air.

You must know that the cause of wind is the temperature difference, the air pressure is low in high temperatures, and the air pressure is high in low temperatures, and the air will flow from the low temperature area to the high temperature area, so the wind is generated......

As a science student, Su Fei's understanding of this kind of geographical knowledge is still very limited, and all he can think of now is only a rough idea, as for the actual situation, I am afraid that he will have to wait for the hot air balloon to be built, and let Anna try it in the sky to know.

Su Fei thought about the money box he had put in the small shop in King's Landing, he had sold a large amount of snake grass water in the past few days, plus his previous savings, Su Fei now had a fortune of two or three hundred golden dragons, and it was more than enough to buy such a drawing.

Without thinking about it anymore, Su Fei directly clicked on the purchase, only to see a flash of light on the system panel, Su Fei reached into his backpack and held the album taken out of the system panel.

This DLC not only contains blueprints for the hot air balloon, but also comes with three more.

The shock absorber can be used in the carriage, Su Fei has a deep memory of the carriage in this world, he sat in the carriage for an hour, his body was about to fall apart, if there was a mechanical shock absorber, it would be much more comfortable.

Then there is the propeller boat, although it is human, but compared to rowing with oars now, the efficiency is much higher, but Su Fei has not yet thought about building a ship, so let's put it first.

As for the bikes...... Su Fei thinks that this is a big business opportunity, if you can build a bicycle, then it will be much easier to travel short and medium distances, but bicycles are not like boats, which involve a lot of small parts.

The industrial level of this world is far from enough, and there is no problem in artificially building some large gears, but to build a more compact bicycle, the technical requirements for craftsmen are much higher, so it is still a little difficult to achieve it under the current conditions.

However, now Su Fei only has drawings, and whether he can take off or not, and whether he can change direction in the air with Anna's ability, will have to wait until he actually makes it.

As for the production, Sophie planned to hand it over directly to Wallace, he was also an old carpenter, although he was a carpenter, but he would also come into contact with other materials when he worked on weekdays, and with detailed drawings, Wallace could do it for him.

Quentin really didn't come out of the study upstairs all afternoon, until Sophie came back from a walk around Kukou Mountain with the three ladies, and when it got dark, Quentin went down to the hall on the first floor with the stack of notebooks.

Looking at Quentin's tangled face, Su Fei knew that he was afraid that he would have to pretend to be a teacher again and explain to him those incomprehensible places......

However, at this time, a prompt suddenly sounded in Su Fei's ears, needless to say, it must be the news of the system.

System message: The first stage of the task is completed, and 30,000 experience points and 30,000 purchase points are obtained.

System message: The second phase of the mission begins, the mastermind behind the spread of the plague is detected, and the number of plague deaths in the first phase will be carried over to the second stage, and the current countdown to mission failures: 954.

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It was already afternoon, and Andy looked at the sky, the sun was already shining on the ground, and they had been waiting here in the heath for hours.

"Father, why haven't the three knights come back yet?" The old man who had led the way for the group stood on the side of the carriage, he looked at the direction in which the three knights had left, and said with some anxiety, "Something can't happen to them, right?"

"Old man, don't talk nonsense, captains, they are all battle-hardened knights, even if they encounter a psychopath who steals corpses, they can be killed all. Said a knight in silver armor who had stayed here to standby.

"yes, you don't have to worry, even if you get into trouble, they can solve it. ”

Andy was sitting in the carriage, and he wanted to get down and walk, but the problem was that the dog meat lay directly on his lap, making Andy keep rubbing its back, and at the same time, the dog meat made a very comfortable "whirring" sound in its nose.

In Andy's opinion, dog meat was sent to the world by the goddess of light...... Well...... Mascot.

Looking at its humane appearance, it is definitely not an ordinary dog!

As the most faithful devotee of the Goddess of Light, of course he has to take care of the dog meat.

However, at this moment, Dog Meat's ears suddenly moved, and it opened its eyes, and the tip of its nose shrugged, as if it had found something.

Dogmeat stood up and got straight out of the carriage.

"Woooooo

"Dog meat!" Andy anxiously got out of the carriage, and when he saw the dog meat barking incessantly in the direction the previous knights had left, Andy had a faint feeling of uneasiness in his heart.

"Be careful, there may be a situation!" Andy called out to the five silver-armored knights who were sitting and chatting.

"Don't worry, Lord Bishop, the captain is ......."

Before a silver armor could finish speaking, this sentence was swallowed back by him, although he was a little lax just now, but after all, he was a trained knight, and the five of them immediately picked up the knight's long sword placed on the ground, turned over their respective horses, and the long sword patted the horse's buttocks, and ran in the same direction.

Five sets of silver armor glittered in the afterglow of the setting sun, and in the wasteland with a wide view in front of them, at the end of the line of sight, three men were running towards this direction in a panic.

One in gold armor, two in silver armor, and a gray dog figure next to it.