Snowflakes fell from the sky, and the Northland prairie was covered with a silver quilt.

The army of the Northern Expedition to Rouran was trapped.

Because of the snow, the surroundings were white and vast, and the route was not identified, coupled with the severe cold in the north, the sergeants could not bear it, and the plan of the army to march north was delayed.

This makes the logistics officer miserable.

100,000 troops, people eat horses and chew, every day is a terrifying number, if you simply rest for a few days, it's fine, but depending on the weather, don't think about pulling out this winter.

After a winter supply of grain and grass, Lao Fan, a logistics baggage battalion, felt that he was about to collapse.

In the tent of the Chinese army, the old range lit a stove and complained to Su Lu.

"Commander, the road from the south is already icy, the road is difficult to walk, and the team transporting the baggage will have to take more than ten days at night, Lord Wang, our grain and grass reserves are getting smaller and smaller."

Lao Fan had a bitter face and was about to cry.

Not only could the road to the north be walked, but even the road to the south could not be walked.

Su Lu put down the military booklet in his hand and glanced at Lao Fan speechlessly:

"It's not a terrible thing to transport baggage, how do the people of the Northland transport things in winter, you won't ask, get some sleds that can slide on the snow, sliders, it's not too easy to transport."

Lao Fan looked confused, and didn't understand what a sled was, a slipper.

Su Lu said it again, seeing that Lao Fan looked confused, and was about to pull the pen and paper over, Lao Fan suddenly jumped up.

"I—I've got my legs burned by the stove."

Lao Fan said with a sneering face, but his eyes flashed.

"Lord Wang, you said that it would be more convenient to use flying birds to transport baggage."

"As far as the last general knows, we have that kind of flying bird, which can transport more than a dozen people, and if it is loaded with grain and grass, it must be a lot, and if the bird can be expanded a little more, there will be more grain and grass that can be transported."

Su Luyi Xingshan, this old fan, the method of the turtle has not yet been figured out, so he wants to make high-tech.

"Okay, I already had a plan for this, the original Flying Bird Battalion eliminated a lot of Flying Bird soldiers, and it is just right to control this kind of flying bird that transports heavy loads."

Lao Fan slapped his thigh and said excitedly: "Lord, the last general will go to the Flying Bird Camp, Her Royal Highness the Princess will definitely support the minister's idea." ”

Without waiting for Su Lu to speak, Lao Fan ran out of the smoke, and the cold wind flew in along the opened curtain with snowflakes, making Su Lu's words swallow back.

Regardless of whether he Lao Fan is going to die, he can toss it if he wants toss, the winter in this northern land is really fucking cold.

Su Lu leaned back in his chair towards the stove, continued to pick up the military booklet, and began to read it.

"Whew"

The curtain was lifted again, and Su Yun rushed in wrapped in the cold wind, his cotton hat was full of snowflakes, and his cheeks were full of excited redness.

"Brother, I thought of a new type of flying bird, you have to pay me to make a trial production."

Su Lu didn't look up, and continued to review the military affairs booklet, although it was winter, but this training could not be stopped, as for Su Yun, it must be the transport birds that Lao Fan said just now, as long as the birds were mentioned, Su Yun was interested, and now he must be planning how to pit the money in the army.

Su Yun saw that Su Lu didn't talk, looked around, and saw that the tent was empty, there were only two guards, and the rest of the main clerks had gone out to train, so he simply dragged a chair over and sat down next to the stove.

"Brother, the new type of flying bird improved by the true yuan dao chief can fly at a height of more than 100 zhang, and the flight distance has reached more than 50 miles, I think if the inner breath conversion cabinet is made larger, and the inner structure is more refined, will this flying bird fly higher, or fly farther."

"It may fly farther, but there is not much hope for higher hopes."

Su Lu put down the military booklet and said, this is a direction for improvement in the future of the bird, if he doesn't make improvements in this area, the Taixi people will definitely make improvements, since they have an academy of sciences, it will definitely not be just a decoration.

Su Yun glanced at Su Lu in surprise: "It hasn't been made yet, brother, you know?" ”

"If you can fly far, you will definitely be able to fly higher, I think what you said is not right."

Su Lu waved his hand: "Okay, okay, you go to the True Yuan Dao Chief, let him try, no more than 10,000 taels, I will approve." ”

Su Yun slapped his face: "Great, Lao Fan Ken will give 10,000 taels to improve the transportation of baggage, brother, you will pay 10,000 taels, and I will take out 10,000 taels from our house when I go back, this larger internal interest conversion cabinet will definitely be." ”

Su Yun said, turned around excitedly and left, and went to the back camp to find the True Yuan Dao Chief.

Fifteen days later, a larger internal breath conversion cabinet was manufactured, and because the army was fine, with the cooperation of the whole army, a larger flying bird was also made.

Looking at the birds that were almost the size of a camp, Su Lu was a little dizzy.

"True Yuan Dao Chief, are you sure this bird can fly?"

The hand of the true elder Tao rubbed the bird, and his face was full of apprehension: "It's hard to say, although the internal information conversion cabinet is more fine, and the weight of the internal information conversion is also higher, but how much weight of the bird can fly, the old Taoist really has no bottom in his heart." ”

Su Lu also has a bit of a headache, the lack of professionals is not good, before doing their own research and development, has always been based on reality, first assume the goal to be achieved, and then carry out the actual design, the general design margin to achieve the required double the margin or even more.

It's good now, Lao Dao just touched the stones and began to cross the river, not caring whether the other side of the river was his destination or not, let alone the amount of money.

"Let's install it first."

Su Lu commanded and said, whether it is successful or not, it is all about accumulating experience.

After the installation of the internal information conversion cabinet was completed, the initial debugging of the bird began, and the true old man drilled into it, and after some internal breath measurement, he was sure that the internal information conversion channel inside the bird was normal and smooth, and jumped out of the bird.

Su Yun deftly drilled in, grasped the lever in a slippery manner, breathed inside, and began to urge the bird.

"Huhuhuhu"

The wings of the huge bird flapped, and the snow around it was blown wildly, and the snow particles hit the face, causing a burst of pain.

Slowly, the flying bird began to rise, but to everyone's surprise, the flying bird only flew slightly fifteen or sixteen meters high, and then completely stopped, hovering in the air, no matter how Su Yun breathed, it just stopped rising.

The true elder Dao pinched his beard, his face was full of consternation, how could this be the case, according to normal speaking, there is no problem at all with this thing flying up to two hundred zhang.

This Nima has only flown less than ten zhang!

"How far can you fly?"

Lao Dao urged Su Yun to say.

The bird flew a hundred meters in the air, and then slowly fell.

"How much rest does Her Royal Highness have left?"

Lao Dao asked Su Yun and said.

Su Yun's hands were wrong, and a palm force erupted, smashing two large handprints on the snow, Su Yun took out a small ruler from his pocket and measured the bathymetric pit.

"I should be able to fly for three or four hours"

Su Yun hesitated a little, according to the calculations in the past, he should be able to fly for another eight hours, but his internal breath has not increased, how can this flying bird be able to fly for so long.

Su Lu's eyes lit up as he looked at the birds the size of the barracks.

If you can fly for four hours, that is, eight hours, even if Su Yun's internal interest is high, and the interest rate of ordinary bird soldiers is different, then it can fly for about five hours, and four bird soldiers alternate, this bird can fly for twenty hours.

Twenty hours, no matter how slow this bird flies, it can fly from Yumen to Hanshui City.

It's a good thing for transporting goods.

If it is further expanded, it will be used for trade between the north and the south, and those precious furs, pearls, silks, and seasonal fruits can be used from south to north at once, and the value of this is immeasurable.

This is a good opportunity to convert military to civilian use.