The hot air balloon airship flew smoothly at an altitude of about 1000 meters, although the hot air balloon airship could not achieve the result that Ling Yu wanted most, but it was also due to the limited conditions, to be able to test the flight successfully, Ling Yu was still in a very happy mood, the same Song Qian was also very happy, although Zhao Zhengkang was unhappy, but he would not show it now.

At this time, Ling Yu's communication machine rang, and Zhou Zhengxiong's voice came: "Ling Aiqing, how is the situation?" "The base of the Academy of Sciences, naturally also the signal coverage, after such a long time of arrangement, the surrounding areas of the capital are basically covered successfully, the Academy of Sciences such an important place will of course be covered, although the cost is relatively high, but timely communication is priceless.

"Your Majesty, the test flight was a success, and Wechen plans to test the psionic energy consumption again and then return home." Ling Yu replied.

"Well, if it succeeds, then I'll wait here for you to come back, stay safe." Zhou Zhengxiong said, and he could hear that Zhou Zhengxiong was extremely happy now.

After a brief exchange between the two, the communication was disconnected, and Ling Yu turned his head and called Cheng Zhiwen and asked him to count the spiritual energy consumption during the flight.

The hot air balloon airship flew around the capital like this, and more than an hour passed, before Cheng Zhiwen returned to Ling Yu and reported: "Master Hou, the eight spiritual energy hot gas furnaces of the hot air balloon airship consumed 1 medium-grade spirit crystal each in an hour's flight, and the thruster consumption is not large, and the subordinates have calculated that a low-grade spirit crystal can be used for the thruster for 1 day, if it is downwind, it can last longer if the thruster is not needed." ”

After listening to the report, Ling Yu knew in his heart that the consumption of the spiritual energy hot gas furnace was quite large, 1 spiritual energy hot gas furnace would consume 1 medium-grade spirit crystal in 1 hour, which was equivalent to 100 silver coins, and eight hot gas furnaces had to use up 800 silver coins in an hour, that is, 8 spirit crystals, and the high cost made Ling Yu frown a little.

However, in order to drag such a heavy pod to fly, it is understandable that it consumes a lot, fortunately, Ling Yu chose the medium-grade spirit crystal as fuel at the beginning, otherwise the low-grade spirit crystal does not know if it can fly.

"Okay, I know, you guys should get ready to go back." Ling Yu didn't bother, this was the original hot air balloon airship, and it was only a test when it was built, the most ideal airship in Ling Yu's heart was to use anti-gravity runes to fly, and the consumption should not be so big at that time.

After Cheng Zhiwen received the order, he went down to arrange the return flight, and all the steps were meticulously implemented, in fact, Ling Yu didn't have any flying experience at that time, but just sorted out some of the limited information he knew and taught them.

Now it seems that this plan is also quite feasible, and it will only need to be improved slowly in the future.

"Ling Hou, are you going back? The old man hasn't flown enough. Song Qian said to Ling Yu with a smile.

"Yes, Lord Shousuke, the test has been completed, there is no need to fly anymore, and the consumption is quite large." Ling Yu smiled bitterly.

"Oh? The old man didn't hear what you and your subordinates said clearly just now, I wonder if Marquis Ling can solve the old man's doubts again? Song Qian said with a smile, and Zhao Zhengkang on the side also pricked up his ears to hear Ling Yu's words.

"There's nothing wrong with this, our hot air balloon airship has 8 psionic hot gas stoves to provide floating power, each psionic hot gas furnace needs to consume 1 medium-grade spirit crystal to drive it for an hour, and 8 psionic hot gas stoves need 8 medium-grade spirit crystals, which is equivalent to 800 silver coins, which is simply burning money." Ling Yu explained with a wry smile, this is also too expensive, I am afraid that it will not be started if it is generally fine, you must know that the spiritual energy locomotive can run 1,000 kilometers with 1 lower grade spirit crystal.

Song Qian was shocked when he heard this, this consumption is indeed very large, so this kind of airship is not so practical, but if it is necessary, no matter how large the consumption is, it must be activated.

"Ling Hou doesn't have to be discouraged, the old man heard you say that this is also the first generation of hot air balloon airship, presumably Ling Hou already has a belly case, and it will be improved soon." Song Qian still comforted Ling Yu gently, after all, Ling Yu had spent so much effort to create something that was not very practical, and Song Qian was worried that he would be disappointed in his heart.

"Hehe, don't worry, Lord Shoufu, I have my own plans in my heart." Ling Yu smiled, and he also heard Song Qian's comfort.

"What Lord Song said is extremely true, Ling Hou, you are still young, some things can be done slowly." Zhao Zhengkang on the side also looked comforted, he felt a little better when he heard Ling Yu say this, such a big consumption, presumably the emperor would not really make and use it on a large scale, but he also knew that this was only a matter of time for Ling Yu, and he couldn't give him so much time, and his heart once again strengthened his previous belief.

Although Ling Yu was surprised by Zhao Zhengkang's words, but after all, people were also kind words and comforting, Ling Yu had no choice but to nod with a smile, indicating that he understood, and he didn't stretch out his hand to hit the smiling person.

The return voyage was very smooth, and it didn't take long for him to return to the sky above the dry dock site just now, Cheng Zhiwen began to order the psionic hot gas furnace to slow down the psionic energy output and reduce the temperature according to the method taught by Ling Yu during the previous training, so that the hot air balloon airship began to slowly begin to land on the ground, and the thruster operated from time to time to ensure that the position of the hot air balloon airship would not deviate.

The landing was much slower than the take-off, and it took more than 1 hour to moor at the take-off position just now, which also made Ling Yu a little disappointed with this speed, if it was the anti-gravity rune airship he expected, then the take-off and landing would be much faster than the hot air balloon airship.

Everyone got off the hot air balloon airship and walked back to Zhou Zhengxiong, for such a long time, many ministers also went back with Zhou Zhengxiong's permission, and the ministers who were still present also found a place to cool off.

Ling Yu walked into the pergola and bowed down and said, "Your Majesty, Wei Chen has been ordered to test fly a hot air balloon airship, and it has been a complete success. ”

"Well, what would you tell me about the cost of this hot air balloon airship?" Zhou Zhengxiong asked with a smile, now there are only a few people left in the pergola that he can trust, so he doesn't have so many scruples to ask directly.

"Your Majesty, this ...... If the cost is not too high, a finished hot air balloon airship will cost about 5000 silver coins to make, but it is ...... This flight consumes a lot of money, and the 8 psionic hot gas furnaces of the hot air balloon airship consume 8 medium-grade spirit crystals in an hour, which is equivalent to 800 silver coins in 1 hour. Ling Yu explained with a wry smile.

"Hiss" Not only Zhou Zhengxiong, but also Zhou Shaobin and Yucheng on the side also gasped, this consumption is too big, Zhou Zhengxiong is also surprised by such consumption, Ling Yu has not replaced the spirit crystal for so long for the locomotive royal chariot, and it is still a low-grade spirit crystal. 85

"In that case, it doesn't seem to be suitable for large-scale equipment." Zhou Zhengxiong said with some disappointment.

"Yes, Your Majesty, Wei Chen also thinks so, Wei Chen originally wanted to design an anti-gravity airship, and the consumption of that kind of airship will be much smaller, but the anti-gravity rune Wei Chen has not made any effective progress so far, so he found another way to use a hot air balloon to provide floating power for the airship." Ling Yu explained.

"Well, I heard Bin'er mention your airship before, can it really be used in battle as you said?" Zhou Zhengxiong asked, he looked at the hot air balloon airship, even with his eyes, he could see that the hot air balloon airship was not very suitable for combat, and the flight speed was not slow, and there was a large shock that would affect the stability.

"Your Majesty, if that kind of airship can be built, our Great Zhou can form a powerful air force, then any corner of this world can be planted with the dragon flag of my Great Zhou, and the place where the sun can shine is the land of my Great Zhou, so that my Great Zhou will become an empire on which the sun never sets." Ling Yu said a little excitedly.

Zhou Zhengxiong was also a little excited when he heard it, the scene described by Ling Yu was something that Zhou Zhengxiong had never thought of before, he had always been troubled by the family in China, as well as the Hu people in the north, and now when he heard the words "The sun never sets on the empire", his heart was inevitably full of yearning.

"Ling Aiqing, do you think I can really plant my Great Zhou's dragon flag in a place where the sun shines?" Zhou Zhengxiong asked with a yearning look in his eyes.

"Your Majesty, the minister firmly believes that it can, there are still many ideas waiting to be realized in the minister's mind, and the minister thinks that once I complete the industrialization of spiritual energy in the Great Zhou, the national strength will be greatly enhanced, and it is not an exaggeration to say that it will crush the world." Ling Yu said.

"Ling Aiqing, you once told me that technology changes life, and the facts have proved that what you said is right, and I will try my best to cooperate with you to complete the industrialization of spiritual energy in the Great Zhou." Zhou Zhengxiong smiled approvingly.

"Brother Ling, let me ask you, since you have no problem testing the hot air balloon airship, when will we go up and experience it." Zhou Shaobin asked on the side, he has been waiting here for so long, just looking forward to Feitian.

"That's what Your Majesty means." Ling Yu smiled.

"Hehe, Bin'er, when can you change your monkey anxious character, since the test is no problem, then let's take a hot air balloon airship back to Beijing." Zhou Zhengxiong also wanted to try it.

"Yes, your majesty, the ministers will order people to prepare, will the courtiers follow Your Majesty?" Ling Yu asked.

"Well, they have also been here with me for so long, let's go together, Yucheng, you go and call them all over, and after a while, Ling Aiqing will set off when they are ready, and land directly in the square in front of the Golden Palace, where the place is big, there must be no problem to land." Zhou Zhengxiong said with a smile.

Yucheng and Ling Yu were ordered to go down to arrange, and Zhou Zhengxiong and Zhou Shaobin, father and son, were left in the pergola, and Zhou Shaobin was eager to try, and finally wanted to take the airship, and he was indescribably excited in his heart.

Zhou Zhengxiong looked at Zhou Shaobin like this, and felt a little funny, if it was before, he might still be a little disappointed, Zhou Shaobin's playfulness was still a little heavier, but after this period of time, Ling Yu was not there, Zhou Shaobin was still able to handle things in an orderly manner, which made Zhou Zhengxiong feel a lot more relieved.

After a while, the ministers who were still present gathered around Zhou Zhengxiong again, waiting to board the boat, and the ministers heard that they could also have the honor to ride the airship, and their hearts were inevitably a little excited, after all, flying is the dream of many people.

Soon after, Ling Yu was ready, this will he prepare a lot of spirit crystals, although the base is not very far from the capital, but the emperor is also on the hot air balloon airship, for safety, Ling Yu is also prepared.

"Your Majesty, you can board the boat." Ling Yu walked up to Zhou Zhengxiong and said respectfully.

"Well, let's go, Yucheng beckoned all Aiqing to board the boat." After speaking, Zhou Zhengxiong, accompanied by Ling Yu, boarded the hot air balloon airship.

Other people, also under the organization of Yucheng, boarded the hot air balloon airship in an orderly manner, the volume of the airship is very large, so these ministers are not crowded at all, like ordinary ships, there are also various cabins on the airship, some of the ministers are watching the scenery on the deck, and some are with acquaintances into the cabin to rest, after all, the weather is hot, and the airship cabin is equipped with psionic air conditioning.

Although the performance of the airship did not meet Ling Yu's requirements, comfort has always been something that Ling Yu has always paid attention to, and naturally it will not fall, and the psionic air conditioner in the cabin is turned on very much, making the ministers who have been hot for so long comfortable.

Ling Yu took Zhou Zhengxiong and Zhou Shaobin to the previous observation deck to sit, this time Zhao Zhengkang was not so well treated, and only Song Qian and others came over, but fortunately, the observation deck was not small, more than 10 people were more than enough to sit down, and several of them were also comfortable to sit here.

Seeing that the boarding was completed, Cheng Zhiwen came up and reported: "Master Hou, you can take off." "Because the emperor was present, Cheng Zhiwen seemed very restrained, although he has been in the Guards and has seen the emperor a lot of times, but he is still a little nervous when he really gets close to the emperor, after all, he was only a soldier of the Guards before.

"Well, slow takeoff." Ling Yu commanded.

Cheng Zhiwen understood, and after agreeing, he went down to make arrangements.

Slow take-off is to slowly provide energy to the psionic hot gas stove, so that the hot air balloon airship takes off less fast, so that there will be no slight concussions like the first takeoff.

Zhou Zhengxiong was on the hot air balloon airship, and Ling Yu naturally wanted to make him more comfortable when he rode it.