Rubbing his hands, Yuan Fang continued: "Also, the speed of turning is a bit slow, and the ground crew also needs to strengthen their cooperation when landing, by the way, there is also a hanging basket, which must be improved, not only to pretend that the animal skin is windproof, it is best to get a cover, otherwise it is too cold this day, and it will not take long to fly and you will have to freeze to death." By the way, there is also the insulation of the power compartment, just a few times the water in it was almost frozen, if the water in the power compartment once frozen, the fog stone can not produce fog, lose power, and in serious cases, it may fall from the air, this problem must be solved. ”

Lin Mengsheng nodded and said, "Well, this question is very critical, by the way, Boss Yuan, how many fog stones did you use?" ”

Yuan Fang calculated and said, "It's probably less than twenty yuan, what about you." ”

Lin Mengsheng rubbed his nose: "Almost, we used eighteen yuan." ”

Yuan Fang concluded: "There are too many fog stones used in take-off, and a lot of waste is wasted, if you remove those wastes, it will take almost fifteen fog stones for an hour, so calculated, the fog stones loaded with two units can continue to sail for a day, well, this consumption is less than half of what is expected." ”

Then, Yuan Fang looked at Ren Chang, the commander of the defenders who had just arrived, and asked, "General Ren, how effective is the incendiary bomb?" ”

Ren Chang said with excitement on his face: "Lord Yuan, the effect of the incendiary bomb is very good, not only the power of the explosion is strong, it can cover a radius of more than five meters, and the iron nails inside can cause penetrating damage to light armor within ten meters, but it is not dense enough, if you add more iron nails, will the effect be better?" ”

Yuan Fang scratched his head and said: "I don't know about this, anyway, there are so many fire oils, and the energy generated by the explosion is fixed, whether adding too many iron nails will be effective or not depends on practice to draw conclusions, in this way, General Ren, this matter will be handed over to you." ”

Ren Chang smiled and said, "Okay, no problem." "He can't study fog balloons or anything, and he doesn't have that ability, but the oil canister is still fine.

Ye Qingru reminded: "General Ren, see if you can design a windproof device, incendiary bombs fall from the sky, it is easy to be blown out by strong winds, there are many incendiary bombs that failed to explode just now, fortunately, the bombs are relatively dense, and the fire oil is ignited by other incendiary bombs." ”

Ren Chang frowned and said, "What kind of windproof device do you want?" ”

Ye Qingru shook her head: "I don't understand this, you can do it." Ren Chang nodded slightly, complaining in his heart, but there was not much pressure, because he was already very satisfied with the effect of the round of bombing just now, even if he exploded a few incendiary bombs, it would not hurt.

After drinking some warm water, his body temperature gradually rose back to normal levels, Yuan Fang ran back to his room without saying a word, took a hot bath, drank ginger soup, and got rid of the cold.

Yuan Fang was fine, but Lin Mengsheng was sick, Xia Yi and the little girl Ouyang Xianxue were also a little uncomfortable, Yuan Fang hurriedly fried a few pairs of medicines for them to take, but the next day, the little girl and Xia Yi became vigorous after sleeping, but Lin Mengsheng's condition worsened, and the high fever did not go away.

Yuan Fang was a little worried, and stayed by Lin Mengsheng's bedside for a whole morning, this kid finally stopped having a fever, his body temperature recovered, and he was awake, but he still had a little cough, Yuan Fang breathed a sigh of relief, and told Lin Mengsheng to rest well, and instructed the doctors at the base to take care of it, and notify himself as soon as possible, so he left and continued to improve the problems found in the first test flight of the fog balloon.

The next day, Lin Mengsheng dragged his weak body to join, and the improvement work proceeded smoothly.

On the third day after the first test flight, Yuan Fang and Wang Jinbao conducted a second test flight, this time Lin Mengsheng did not participate, his body was too weak, and the wind and cold last time had not been completely healed, so he had to stay on the ground to statistics.

This time, a layer of cowhide was added to the inside and outside of the hanging basket, and Yuan Fang and they also changed into warmer leather and warm clothes made in the past few days, and they insisted on it for a longer time than last time, and the test lasted for a full hour and a half, and all kinds of data met Yuan Fang's requirements.

Especially the accuracy of bomb throwing, Ye Qingru shared her experience without hiding herself, and Sang Rou's accuracy has improved a lot, but this kind of thing is not something that can be completely mastered by just talking, and it takes a lot of practical exercises to really improve.

Ren Chang's new generation of incendiary bombs has a good effect, after adding more iron nails, the splashing effect is more than twice as strong, and the lethality is not damaged at all, and the general leather armor can be pierced within ten meters, such an incendiary bomb, if thrown in a dense enemy array, the casualties can be absolutely amazing.

After the basic test of the fog balloon was completed, the next step was to continue to test flights to find hidden problems, during this time, Yuan Fang and Lin Mengsheng began to study and mention a larger airship, which is the main configuration of the Air Force in Yuan Fang's mind.

On the third day from Yuan Fang's arrival, Lin Mengsheng ordered the female worker to sew the airship's airbag according to the drawings, this airbag is different from the fog balloon, it is a huge horizontal cylinder, similar to a whale, to make this thing, but it takes a lot of effort because it is too big.

Under the airbag of the airship, a closed structure like a cabin is adopted, fifteen meters long and three meters wide, made of basha wood with a relatively light texture but strong structure, this kind of wood is relatively expensive, and the wood used in a cabin costs more than 300 taels of silver, which is several times that of ordinary wood.

Such a behemoth is natural and light and flexible, so Yuan Fang didn't plan to make it like a fog balloon that can be folded and stored, so he simply made an airbag keel directly with vines and basha wood to support the heavy cowhide airbag, in fact, there is no way to do this, the design of the airship uses jet power, that is, an opening at the tail of the airbag that can be opened and closed at will, an external propeller, relying on the sprayed fog to drive the propeller to produce thrust.

At the same time, there are exhaust holes installed in the front and back of the airbag, up and down, left and right, used to adjust the flight direction and altitude, braking, and the swinging tail for fine tuning, so that the rope and pulley connecting the exhaust hole are very much, if you have to reinstall and adjust before each take-off, it takes a long time to prepare, and it takes too much time, it is better to get a frame like now, not only can support the airbag, but also can fix each pulley, before use, only need to check and adjust a little to be able to lift off.

It took a lot of effort to assemble this big thing, and almost all the workers came to help, but even then, it took two whole days to assemble it.

During this period, Yuqing saw that Yuan Fang had not returned for a long time, and after discussing with Yang Xing, she brought some people over to see what Yuan Fang was doing, and when Yuqing saw the airship that occupied most of the space in the entire assembly workshop, she was shocked on the spot, and after hearing that this was a flying machine researched by Yuan Fang, her first reaction was impossible, how could such a big thing fly into the sky.