Yuan Fang calculated, it takes half an hour, that is, an hour, for the sand in the hourglass to flow clean, and a fifth of an hour is about twelve minutes, and it only takes twelve minutes to inflate to liftoff, which is fast enough. Yuan Fang gave a thumbs up, expressing his satisfaction with the time-consuming, and made a rising gesture to the people below, and the workers below hurriedly untied the Range Rover.

The fog balloon that lost its restraint rose violently, and the defenseless Yuan Fang only felt that his body was light, as if he was doing an elevator, there was a feeling of weightlessness, and then he saw that the scenery in the distance was getting smaller at an unexpected speed, Yuan Fang hurriedly closed the lid of the power cabin, pulled the exhaust hole on the top of the airbag, and released the fog to reduce buoyancy.

With the exclamations of everyone on the ground, two fog balloons rose into the sky, Wang Jinbao's face was full of worry, and his eyes were full of astonishment.

Yuan Fang responded calmly, and quickly controlled the fog balloon in a controllable range, patted his heart and said, "I'm scared to death." ”

Ouyang Xianxue's face turned pale, her hands clutched the railing tightly, and she said loudly with tears in her eyes: "Brother-in-law, can you slow down next time?" ”

Sang Rou agreed: "Well, put a few less fog stones." Yuan Fang smiled awkwardly, expelled the excess fog in the power cabin, and turned his head to look at Lin Mengsheng's fog balloon on the right.

Lin Mengsheng's reaction was not as fast as Yuan Fang's, the fog balloon just now soared into the sky, which scared him silly, and in the end, it was Yu Jingqiu who made a move, so that he could solve the crisis just now in time, otherwise if he delayed for a while, the fog balloon didn't know how high it would fly, and if it lost control and flew directly into the troposphere, the consequences would be unimaginable.

Lin Mengsheng woke up from the shock, nodded gratefully to Jingqiu, took a deep breath, calmed down, and waved his hand to Yuan Fang on the opposite side, indicating safety.

Raised to a height of almost a thousand meters from the ground, Yuan Fang waved his hand to Lin Mengsheng and signaled to go, and then, the two of them turned on the switch on the top of the thruster at the same time, and the fog surged out along the two-finger-thick pipe, and the air flow drove the propeller to rotate, generating forward thrust, and drove the airbag through the gondola to slowly move towards the west of the forest, and at a certain speed, the hanging basket and the airbag were basically synchronized and then turned on the switch below, and the second propeller began to rotate, and the speed increased suddenly.

From a distance, two fog balloons streaked across the sky, leaving four straight clouds, as if writing excitement in the sky, and all the workers who saw this scene cheered in unison.

Wang Jinbao did not cheer, did not jump, stood on the commanding heights and looked through the telescope to observe the ground in the distance, where a group of soldiers were looking up at the sky.

The two soldiers were lying on their backs, and a spear in the middle of their heads was deeply inserted into the ground, perpendicular to the earth, and the squad leader tilted his head and looked at the approaching fog balloon and reminded: "It's almost there, you two cheer me up and report it as soon as possible." ”

The soldier lying on the ground cried out, "Captain, it's too cold on the ground, can you get me something to put on the ground?" ”

The captain scolded: "Less nonsense, hold on, just wait." ”

As the fog balloon approached little by little, the soldiers on the ground couldn't help but become a little nervous, and when the fog balloon reached the top of their heads, the soldiers lying on the ground used the spear as a reference to make sure that the fog balloon had arrived in the sky, and shouted excitedly: "It's here, captain, they've arrived." ”

When the captain heard this, he immediately raised the colored flag in his hand and waved it left and right. When Wang Jinbao received the signal, he immediately commanded: "Record, reach the first coordinate." ”

The assistant next to him immediately checked the hourglass and took notes, while the other assistant turned a brand new hourglass upside down and started to re-time.

Wang Jinbao continued to pay attention to the fog balloon in the sky and the soldiers on the ground, and asked without looking back: "How long?" ”

The assistant replied, "It's about a kilometer away, and it took about two minutes according to Master Yuan's metering." ”

Wang Jinbao nodded slightly: "It should be faster, there was an acceleration process just now, and now the power is fully open, and the speed has reached the extreme." ”

Soon, Yuan Fang and Lin Mengsheng faced the cold wind, controlled the direction of the fog balloon, and galloped side by side, passing the second coordinate point.

When the soldier in charge of monitoring waved the colored flag, Wang Jinbao again ordered someone to record and re-measure. As Wang Jinbao judged, this time the 1,000 meters took even shorter, only half of the previous one, and only took one minute, in other words, the speed of the fog balloon has reached 60 kilometers per hour.

Through the observation of the telescope, the gondolas of the two fog balloons are slightly tilted forward, which also means that this speed has reached the limit of what the first generation of fog balloons can bear.

Yuan Fang stood in the hanging basket and shivered, you can imagine how cold it is in the middle of winter, flying at a speed of 60 kilometers per hour in the face of the cold wind.

Sang Rou, who was squatting in the hanging basket to avoid the cold wind, pulled Yuan Fang's leather coat that had been frozen hard, and said tremblingly: "Brother-in-law, you can also squat down and warm up." ”

Yuan Fang raised his hand and patted off the frozen haze on the face towel, and said tremblingly: "No, there are still many items that have not been tested." ”

Xia Yi felt sorry for Yuan Fang, and volunteered: "Brother-in-law, I'll take a stand, and you will rest." ”

Yuan Fang wanted to insist, but it was too cold, so he had to nod and say, "It's okay, I'll change you when I'm warmer." Xia Yi took over the fog balloon and controlled the direction of the propellers, keeping a straight line while constantly observing his companions to keep a safe distance.

Lin Mengsheng's side has also been replaced, this kid's physique is not as good as Yuan Fang, and he was almost frozen, Huo Bingyan had to light a gas stone blowtorch to help him keep warm, otherwise this kid would have to be frozen into a popsicle before he landed. Yuan Fang sat in the hanging basket, there was no cold wind, it was a little warmer, but the hanging basket made of thousands of silk vines was still showing the wind on all sides, Yuan Fang snorted and shivered: "No, this hanging basket has to be changed, at least get a layer of cowhide to block the wind, otherwise the people inside don't have to do anything, Xian Xue, quickly light the blowtorch and roast the fire." ”

Ouyang Xianxue was already too cold, and when she heard this, she hurriedly took out the blowtorch, put some alcohol inside, and lit it with a flint, and when the alcohol burned almost and the blowtorch had a certain temperature, the little girl took out a water bladder from her arms and poured some water into it, covered the lid, and lit the nozzle.

A few people gathered around to block the cold wind, and used the finger-long blue flame of the blowtorch to keep warm, which was unique.

Xia Yi stomped his feet and shouted, "Who will take over, I can't stand it." Yuyue stood up, took the lever, and made way for Xia Yi.

It took a full hour for the two fog balloons to complete the basic tests, including liftoff, acceleration, rapid flight, climbing, altitude reduction, steering angle, speed against the wind, etc., although there were no precise instruments, and the approximate data could be measured by manual measurements alone.