Old Dai Tou ate wine, and people became talkative.

"In our shipbuilding business, our ancestors didn't have too many requirements, just simply using local materials, and using whatever wood there is.

There is absolutely nothing wrong with building some ordinary ferries or fishing boats, which are simple and convenient to use local materials.

However, later on, the ship became bigger and bigger, and the purpose of the ship became more and more refined, and the structure was different.

Laymen only look at the appearance and think that the ship is actually the same except for the size, but in fact, the internal structure and the strength of the hull are completely different.

Even if it is two identical cargo ships, the salt ship and the grain ship are not the same method, and a bucket of grain weighs? How much does the same bucket of salt weigh?

A bucket of rice is about thirteen or fourteen catties, and a bucket of salt costs more than 20 catties. It's definitely not a matter of looking at the size to see the actual carrying capacity of a ship.

A privately built merchant ship, such as a ship of 5,000 materials, is considered the largest ship, which can carry 6,000 stone of grain, but in fact it usually carries 5,000 stone, and there must always be 100 shipwrights at the helm.

But the same 5,000-material warship can reach 10,000 stone grain when fully loaded, but it can actually be loaded with 8,000 stone, which is the difference between the carrying capacity of warships and ordinary cargo ships. ”

Although what Lao Dai Tou said was not the same as what Yang Huairen had expected before, he was an expert and what he said should be more accurate.

According to this calculation, the carrying capacity of an ordinary cargo ship is about 600 tons, and the carrying capacity of a warship is about 1,000 tons.

As for why there is such a big gap, it should be that the old Dai Tou said earlier that the materials used in shipbuilding are different, and the large ships of the same scale caused by different manufacturing methods should be different in terms of load capacity caused by structural strength and other reasons.

Yang Huairen asked with a smile, "Then build a ship according to the specifications of the warship." ”

Old Dai Tou smiled, "The prince thinks simply. According to the regulations of warships, the ships built are indeed more durable and durable, and the carrying capacity is also higher.

But everything in this world is balanced, and to build a good ship, you need better craftsmanship, you need better wood, and not only does the load seem to be nearly twice as high, but the cost is even more doubled.

It's not easy to understand the craftsmanship alone, the old man just takes the matter of materials as an example, and the prince can naturally understand.

Nowadays, the process of shipbuilding can no longer simply use the ancient way of taking local materials, different wood has different characteristics, according to the different characteristics of wood, the wood is used in different places when shipbuilding, which is the correct way to build a good ship.

For example, the mast should be made of good cedar wood, the trunk of the cedar tree is straight, and the texture is quite extensive, which is the best choice for masts or building columns and girders.

Fir trees grow quickly, so the timber used by ordinary people to make girders, it is enough to use ten-year-old fir wood, but the fir used as the mast of ships is different, and at least twenty-year-old cedar trees are qualified.

Those private shipyards are generally good at making freighter trees that are more than 15 years old, but if they are building war ships, they must be 20 years old, or even 30 years old.

But the wood is this thing, the older the material, the less the quantity, the more expensive the price, a four-zhang long beam, ten years of fir is only 500 wen, fifteen years of life can not use the consistent money.

But the price of Liang Cai, who is born in 20 years of the same length, goes up, at least three times, and if he is born in 30 years, he costs seven or eight dollars, and the better the material, the more expensive the price.

But in general, you get what you pay for, and why those ordinary cargo ships can't leave the shore for a hundred miles, it's because they're afraid of the wind and waves at sea!

On the southeast coast of our Great Song Dynasty, in summer and autumn, there are always storms, far away from the coast, those cargo ships can't withstand any storms at all, and the masts may be broken at any time.

But if a 30-year-old fir is used as a mast, at least an ordinary storm can still be resisted.

In addition to the mast, the other structural columns and beams on the ship can be made of pine, and there is a kind of pine wood, which is specially used to make side plates and bottom plates, because the oil content of pine is large and it is not easy to be eroded by seawater.

As for the pallet, it is best to use cypress, which is wear-resistant, and also corrosion-resistant because of the large amount of resin;

The side panels are made of camphor wood, and they are made of camphor wood cut in winter, because they will not be eaten by insects, and the harvesting in spring and summer is the opposite, which is easy to moth.

The best oars are teak, which is highly elastic, durable and rich in a special oleoresin, which can prevent seawater corrosion.

The ship's hatch doors and windows are not very demanding, but it is best to use balsa wood, which occupies a small weight and can free up more carrying space for the ship.

The prince should have understood, the wood used in these shipbuilding materials that the old man said is expensive, and those private shipyards will not use such good materials.

In addition, the main side panels of ordinary cargo ships are made of two layers of wood, but for war ships, at least three layers of wood, or even four layers of wood.

Although the old man has never seen how to fight a warship on the sea, he has also heard the old people talk about it, that is, it is simple to go up and hit it directly, so the bigger and more solid the ship, the better.

Let's just say that if a warship collides with a cargo ship of the same size, the warship can knock the cargo ship apart and still be safe and sound, and only with good materials and good craftsmanship can such a strong warship be built.

In this way, probably the prince should also understand why the old man said that the warships of the Changguo Army are not real warships, right?

Therefore, if you want to build a real warship, a ship of the same size can be built at least twice as much as an ordinary cargo ship, and sometimes even three times as much.

Merchants go to sea trade, there is no need to build a sturdy cargo ship, and our shipbuilding technology in the Great Song Dynasty is much better than those Fanbang barbarians, even if the cargo ship collides with them, they can't hit it.

Only the Great Cannibal Cargo Ship can barely be compared to our Great Song Cargo Ship, but if we build a war ship, their ship will not be enough.

As for our Great Song Dynasty's naval army, we don't have to go to sea to fight against anyone anyway, so it is not appropriate to spend a high price to build a real warship, and the imperial court will not spend money on it.

Therefore, the warships of the Changguo Army at that time were made in the Li & Fung Shipyard at that time, and the materials were also very economical, and the craftsmen were concerned about the country, so they tried their best to use their own craftsmanship to build the ships stronger.

The maintenance of the warships of the Changguo Army is not necessarily very careful, it can be used for more than 40 years, almost 50 years are so dilapidated and can still be used, even if it is good.

After hearing this, do you still think you want to build a real warship? ”