Chapter 155: The Great Voyage

In the words of Su oil, it was a great voyage.

From the second forest department to Meizhou, if you take the ancient tea horse road, it will take about five days.

But if you take the waterway, you have to enter the Min River from the glass river first, and then go down the river, all the way to Yibin County, the confluence of the Min River and the Yangtze River, and then turn back, go all the way along the Jinsha River, go deep all the way along the Jinsha River, pass through half of Dali, reach the entrance of the Anning River and the Jinsha River, turn into the Anning River and go all the way north, pass through Jianchang Mansion, and finally arrive at the Erlin Department.

The whole voyage is like a huge U-shape, with two heads of the U-shape, the left is Erlinbu, and the right is Meizhou.

The blank part in the middle of the two ends is a straight line, which is the ancient tea horse road hidden in the deep mountains, and the whole U-shaped solid part is a part of the waterway of the Southern Silk Road.

The whole journey is more than 1,600 miles, and the planned time is one month.

This is also a big cycle, now the second forest department to Meishan, the goods are mainly sent to Lingjing, and they are also carrying the products of the southwest minority areas.

In Meizhou, it is not cost-effective to exchange for Songdi goods and come back, taking the ancient tea horse road.

Hundreds of tons of goods are horse-drawn back, and thousands of horsepower have to be used, and the cost is too high. And the use of the big ship of the second forest department is a matter of one ship.

So although it's a super big circle, it's time to go.

And the goods finally went to the Erlin Department basically only salt, and most of them were sold when they passed through Dali.

Behind the big boat, there are also two small boats in tow, Su You inquired, it turns out that after the Song Dynasty, you have to be careful, if you can live on the big boat, you can live on the big boat, and external traffic is mainly carried out through the small boat.

The voyage was very fast, it only took three days, the ship arrived in Yibin County, Jiazhou passed as early as the first night, and the harmful Suyou did not even see the Leshan Giant Buddha.

After the ship was replenished in Yibin County, it began its voyage against the current.

All of a sudden, the speed slowed down.

Jinsha River, to the 21st century in the future generations there are still a large part of the wilderness, now it is basically the whole process of primitive, the two banks are covered with dense primeval forests, the real "apes on both sides of the river can't stop crying", so that Su You reminds of the documentary scenery on both sides of the Riamasun River.

Along the way, there are occasional tribal communities, scattered in the open area, looking at the situation, it is still in the stage of slash-and-burn farming.

Su You was bored, so he simply moved out the sawing machine and foot-operated workbench to teach the soldiers to operate and process wooden parts.

By the way, pick some facilities on the ship to improve, such as adding bearing sail rope pulleys to the top of the mast, anchor cables and winches, etc., which can be regarded as learning and practice.

The biggest modifications were the addition of a watertight cabin and the moving of the helm compartment to the bow.

This ship looks mighty and majestic, it is a streamlined style of a battleship, and the speed is indeed very fast, at least in the Jinsha River Valley, except for the Song army, the Erlin Department can rely on this ship to run rampant.

However, Su You went down to the cabin and was scared half to death, there was no watertight cabin, and my sister was cheated by the treacherous Great Song shipbuilder!

For your own safety, this one must be transformed!

Although the boat boss thinks this is a superfluous move, where is the freshwater river so dangerous!

But Ah Homi is now so fond of this cheap brother, the younger brother said that the moon is out during the day and the sun is out at night, which is right, not to mention the small watertight compartment, change!

Chen Yu squatted at the stern of the boat and drew a circle, Fanbang Demon Girl, Lao Tzu Liang has to scare the sword once, and now Su Mingrun has turned the bottom of the boat over, you are still happy to clap your hands, no way! Fatuous!

However, the ship's boss absolutely supported the transformation of the helm room, and a large steering wheel was erected on the bow, and bearings were used, which made the transmission extremely flexible.

Controlling the gear set and driving the ropes that are taut along the side deck with a fixed pulley allow the rudder to steer flexibly.

The tiller of the stern rudder had not yet dared to be taken, and the first mate was afraid to guard the rear, fearing that if the bow rudder failed, he could immediately take over control of the big ship.

There are so many benefits to moving the rudder forward that the boat boss can determine the water conditions ahead in time and no longer be blocked by the hull and sails.

Su You is also amazed by today's sailing technology.

The Chinese hard sail was not included in the four major inventions, which is really unfair in Su You's mind.

Since ancient times, this sail has been known for its ability to control the wind in all directions, ease of sailing, and minimal crew use, which cannot be done by Western sails.

Although most of China's coastal waters are north-south winds, the wind direction changes rapidly, and the average annual wind speed is level 4, which is simply not suitable for the western sails.

When the Portuguese arrived in Macao, they replaced their sails with Chinese stiff sails to adapt to the wind conditions off the coast of China. This Western-style ship with a Chinese sail, known as the Old Lock Boat, has been used by the Portuguese for a long time.

The biggest difference between Chinese sails and Western schooners and schooners in the use of wind power is that they can both use static wind pressure, that is, wing lift, that is, the sail arch is generated by the wind flowing through the sail surface, and the pressure difference between the wind speed of the upper surface and the lower surface is different, that is, the Bernoulli effect.

This lift is much greater than the pressure generated by the wind on the sail during downwind, so for Chinese hardsails and Western sails, the speed of the boat is fastest in crosswinds, and the lift is not reduced by the increase in speed, so the speed of the boat can sometimes exceed the wind speed.

The sail can only use the dynamic wind pressure when it is downwind, and the higher the speed of the ship, the smaller the speed difference between the speed and the wind speed, and the smaller the thrust of the sail, so the sail can never exceed the wind speed.

The hardness of the Chinese hard sail is only compared to the lack of struts in the soft sails of the West, and the stiffness of the Chinese hard sail actually divides the sail surface into many parts because of the struts, which plays a role in strengthening the sail surface.

Therefore, the sail material of Chinese sail can be used with a lot of sail materials that are not "high-grade", mats, canvas and even face pockets can be used as sail materials.

Western-style soft sails, on the other hand, can only use high-quality canvas because there are no supporting supports or ribs on the sail surface.

In addition, the props of the Chinese hard sail can prevent the expansion of the hole in the sail, while the hole in the Western soft sail will cause the whole sail to crack under the action of strong winds.

Therefore, the holes in the Chinese hard sails do not need to be too concerned for the Chinese crews, and the Western sailors often see the many holes in the sails of the Chinese sailing ships and laugh at them, but they do not notice that these broken sails can still sail briskly, while their own sails must stop and change sails if such a situation occurs.

When encountering strong winds, the Chinese hard sail is very fast because it is raised from the bottom to the bottom.

In case of emergency, the sail is dropped instantly when the rope is cut with a knife, and the center of gravity of the boat drops at the same time, so it is much safer than a Western-style sailing ship.

When using mats as sails, Chinese hard sails are very heavy, but when they are made of cloth, they are almost the same weight as Western sails.

The only disadvantage is that as a kind of shoulk, it rotates around the mast, so it cannot be equipped with a mast pull rope to increase the force strength of the mast.

In addition, the Age of Discovery was missed, so the tall mast system was not developed.

In fact, until the American Civil War, schooners were still crisscrossing the sea, the famous Wyoming is 100 meters long, six masts and eleven sails, with a full load displacement of 9,100 tons, of which the cargo carrying capacity reaches 6,000 tons, and the maximum speed reaches 16 knots against the sky, and the standard crew only needs 14 people!

And then, after the development of steel masts, except for antique ships, the world of sailing became the world of schooners!

Such schooners, often with their high speed and flexible steering, were used as transport ships, breakaway blockade ships, frigates.

It's a pity that the rulers of China in successive dynasties, for various reasons, liked to ban the sea, and even forbade the construction of pointed-headed sea ships, and forced China's navigation technology to die in their adolescence.

There are many similarities between the big ships of the Erlin Department and the Western schooners of later generations, so the crew responsible for the control is actually only six people, and the rest are all Ahomi's rapid reaction forces.

The leader of the team is still Ah Hoard, responsible for security and hunting. Several Meishan people are happy to see the hunting, and after the Song realm, after Ah Hoard took out the crossbow from the bottom warehouse, several people were even happier, and they went ashore in a small boat every day to play crossbow hunting.

Su You doesn't like to join in the fun, he likes fishing.

But he doesn't like to fish with Ah Ho Mi very much, this girl is too noisy.