"Full speed, full speed, full speed......" Yanagi shouted, waving one hand forward.

No one could hear what Yanagi was shouting, because the voice next to the steam engine was too loud. However, they could understand Liu Mu's gestures, and shovels of coal were poured into the furnace, and the pressure in the boiler reached a critical point.

Datang can't make a pressure gauge at the moment, but Datang's craftsmen have a way.

They made several live buckles, and made a small mechanism at the live capture site with steel plates and other mechanisms, and when the pressure reached the upper limit of the safe value, a whistle would be blown.

Then there are the two whistles of danger and extreme danger.

It can be said that if the three whistles sound at the same time, the boiler will not be far from exploding.

At the sound of the first whistle, the ship began to slow down the refueling and then properly replenish the boiler with a little water.

The speed of the ship reached about thirty knots in later generations.

There were no goods, no boats, no people even pulled a few people, and there were only ten stones of coal.

Li Shimin stood at the water's edge, and after hearing a long whistle, he saw a boat like a giant elephant running wildly, faster than a fierce horse from the river, rushing towards the front.

On the boat, Li Dejian saw that the Emperor Taishang and the Emperor of the Tang Dynasty were standing on the shore, and immediately ordered the boat to get closer to the north shore so that the Emperor Taishang and the sage could see more clearly.

This is an opportunity to show their faces, the craftsmen have worked hard for three years to have such achievements, and they also hope to let the Tang Emperor Li Shimin see it.

Yanagi felt the direction of the bow of the ship change, and said bad things in his heart.

But it's too late to stop it, so hurry up and gesture to Dugu Lanruo on the shore and hide quickly.

Dugu Lanruo reacted, but she was still far away from the Tang Emperor Li Shimin, and while instructing the guards to hurry over, she pulled the eldest grandson Wujian to hide behind a big tree.

Li Shimin on the shore not only did not hide, but took two steps forward to see more clearly, and the person was already standing by the water.

The boat passed at high speed, it can be said that when it passed through the shore of the Zhuangzi of the Jing River, it was the maximum speed of the boat, and the coal just added would burn more vigorously, only to see the water surface stir up a splash several feet high.

Li Shimin saw the splash, but he still didn't take half a step back, and pushed aside the forbidden army that came to persuade him to leave.

Liu Mu stood at the bow of the boat, and the bow of the boat was slightly out of the water.

When the boat passed by Li Shimin, the distance between Liu Mu and Li Shimin was less than three feet, and the water stirred up by the boat drenched Li Shimin from head to toe.

Tang Emperor Li Shimin didn't even blink his eyes, staring at Liu Mu and the boat.

Swimming upstream, faster than an ordinary fierce horse, the heat in Li Shimin's heart had already made him not care about the icy river water pouring down his head.

But the attendants did not dare to think so, and quickly someone brought charcoal fire, and someone went to get dry cloth.

Fortunately, the weather was cold, and Li Shimin was wearing a mink coat outside, and it was estimated that he would have been soaked long ago if he changed it into an ordinary silk cotton robe, but his hair was all wet right now, but Li Shimin had no intention of leaving.

Calling the craftsmen who stayed in the dock, Li Shimin asked, "Is this ship built?" ”

"Sage, the ship is still on the ship's dock and has not been installed. There are two more tests of this test ship, that is, the heavy boat tugboat to test the water, and 15 heavy tank grain ships with a total of 15,000 grain tanks have been prepared at the Jinghe wharf. ”

"Yes." Li Shimin nodded, and motioned for someone to prepare tables and chairs and light a fire, and he was ready to sit here and watch the results come out.

After a while, the willow turned around from a wider part of the river upstream.

When he went down the river, the willow wood ran faster, but this time he passed through the other side of the river, and he splashed the Tang Emperor with water just now, and Li Dejian's face turned pale with nervousness.

Tables and chairs were set up, and several fires were burned.

The eldest grandson Wujian and Dugu Lanruo also came to the shore, and this time the guards also specially prepared a huge oilcloth, afraid that if there was water splashing again, they would immediately rush forward to block the splash.

This time, however, things are different.

The boat is not fast against the current, but it is faster than a sailboat and not slower than a horse-drawn carriage.

Yanagi ordered the hourglass to be reversed, and then kept placing the rope to calculate the speed.

"Fifteen fully loaded tankers can't be pulled, and the steam engine already has an abnormal sound, which is not appropriate. My opinion is minus six boats. Li Dejian said in Liu Mu's ear, and Liu Mu nodded: "Flag language, let go of the six boats in retreat." ”

The speed of the boat still did not come up after only pulling nine grooves, but the speed was much more stable.

About a pillar of incense later, the man hanging on the side of the boat shouted, "Speed seventy." ”

The speed shouted here is seventy miles per hour, that is, two hours and thirty-five kilometers, which is seventeen.5 kilometers per hour, which is about ten knots.

"Playing the flag, and putting three boats for each pillar of incense." Willow shouted.

Someone here is constantly recording the speed.

The speed of five trough grain ships can reach fifteen knots, that is, one hundred and five miles per hour.

"The total length of the canal from Chang'an to Huating is about 2,500 li, and according to the average speed of 80 li, it can be from Yangzhou to Chang'an in 30 hours." Li Dejian said excitedly.

Liu Mu said: "Do you think that the flow of the small river Jing River can be compared to the upstream of the Yangtze River, and it can reach the fastest speed in forty-five hours." And it is still unknown whether our steam engine can tow this heavy ship for four days and four nights in a row. ”

Li Dejian nodded, what Liu Mu said was not wrong.

The speed of the Jing River is gentle, and when you change to the Yangtze River, or the canal with a very fast flow, the speed can only be calculated according to the top speed of 70 miles and the average speed of 50 miles. Then it would take forty-five hours to swim against the current.

The ship was pulled back to the dock, where the steam engine was inspected and the building was ready for two days to be installed.

Li Yuan, who had been watching all this silently, waited until Liu Mu walked to Li Shimin's approach before he said, "You are hiding such a big thing very tightly. ”

"Does Father think this big toy is interesting?"

"You don't understand this big toy." Li Yuan shook his head, and then stretched out his hand and pointed at the Jing River: "Let's just say that this Jing River, you can go upriver and get to Longzhou in one day and night with this boat, or dig another canal without Changtai, only more than fifty miles, and turn to the Tao River......"

Li Yuan was studying the Western Expedition last night, and at the moment, in his opinion, he only needed to dig a total of more than 200 miles of canals, and after repairing some river channels, the Liumu boat could go straight up against the current and reach Haizi. That is, Qinghai Lake.

Then build a large wharf in Haizi, a large warehouse area, and garrison.

Then after the Western Expedition, it has a miraculous effect on Datang's stabilization of the Western Regions, and the transportation capacity of this transportation of materials and troops is a hundred times stronger than that of transportation such as horse-drawn carriages and rickshaws.