From Chief to Ball

The Dutch once thought that there was only one kind of windmill in the world, the windmill surrounded by tulips and turned into a landscape. It was not until they set foot on the land in the East that they realized that there were more than one kind of windmill.

This kind of windmill is upright, similar to a revolving lantern or a top, and the direction of rotation is parallel to the ground instead of perpendicular to the ground, which can save a helical gear transmission steering device.

More importantly, there is no need to adjust the angle of the windmill. It looks like a rice character from top to bottom. No matter which direction the wind blows from, it can rotate, and the speed can also be adjusted by raising and lowering the sail.

Windmills can not only be used as power for stone mills, but also can be used for water lifting, irrigation, and wind blowing in the future. It is best to make them before the wheat is harvested. If they cannot be made, they will be regarded as technology accumulation.

Since it is to drive the stone mill, the power does not need to be too large, only one horsepower is enough, and the first windmill does not need to be too large.

The location of the windmill must be on the cliff to the east of the city, where the wind is just right, and using the windmill as power, a simple winch can be used to lift the wheat from the bottom of the mountain to the top of the mountain, and even build a small one under the cliff. Wharf, to maximize the advantages of water transportation.

The principle of the vertical axis windmill is similar to that of a sail. Six or eight sails form a rice-shaped shape. When the wind blows the sails, they will rotate.

The vertical shaft can use a log with a large top and a small bottom to form a T shape. Of course, the T prefix is ​​much smaller.

The bottom of the T head passes through the hole, and the T head is stuck on it. The sail is placed on the lower part of the T log. When it is turned in this way, it is supported by the upper T head. Gear transmission will do.

The support frame can only be fixed with wood, which can ensure that it will not be blown down by the wind.

On the whole, it can actually be regarded as a flat wheel, and the axle is upright.

With the pottery wheel and the wheel as the basis, this is not difficult to understand, or it can be regarded as a pottery wheel that is not driven by a belt, but blown by the wind.

After drawing the construction plan on the bark, Chen Jian took people to the pine forest upstream and cut down four fir pine trees that could not be carried by one person and two more than one foot thick as materials for the support frame.

After putting it on the edge of the cliff along the river, I pulled it up to the cliff with a rope, pulled out the bark, dug a hole at the foot of the pillar, put one end into the hole first, and used the method of laying bricks to increase the height. Pine stood up, as the foot of the column.

Just like pointing a four-pointed star, there are two horizontal ones on it, intersecting each other. After carving a mortise and tenon, it is fixed with a copper curium and pulled with a rope.

Above the height of five meters, three large cedar pines are interlaced, forming a simple frame.

Two thinner fir pine suspension wires were then carved into wooden squares with a saw, which took two full days to complete.

A groove is dug in the middle of the wooden square, so that the two pieces of wood can be pressed together after crossing, and glued with fish bladder glue to form a cross shape.

Cut out a round hole in the center of the cross, which is similar to where the wheel meets the axle.

Lift these two pieces of wood to the top of the four fir pine trees and fix them. Even if the prototype of the frame is completed, it can fully support the strength of a horse, or even more. Chen Jian rarely saw such a thick frame in his previous life. The fir is loose.

During the two days of carving wooden squares, those who did not carve wooden squares were not idle, and were making canvas and sail frames.

The canvas is made of sackcloth, pasted and glued with acorn starch to prevent air leakage.

The sail isn't too big, it's more than three meters high, two meters wide, and has eight sides in total. Chen Jian reckoned that if he didn't do anything else, it should be no problem to push a stone mill.

The repaired vertical shaft was pulled to the top, passed through the hole of the cross, imitated the wheel at the perforated place, made a metal slot, and filled it with grease.

The vertical shaft is about one and a half meters away from the ground, and it is suspended in the air. Chen Jian tried it, and he can push the vertical shaft to rotate by himself, and the wind force is no problem.

After it was confirmed that it could be pushed, bricks were piled up to make it higher. The clansmen installed eight crossbars on the top and bottom of the vertical shaft as places to hang sails.

After some calculation, basically three sides of the eight-sided sail are always under force, that is, nearly [-] square meters, the air density is about one kilogram per cubic meter, and the torque of the sail is about four or five meters. If the radius of the wooden gear below is If it is half a meter, it only needs three or four levels of wind and a wind speed of about six meters, which is enough to generate a force of [-] kilograms on the wooden gear.

Counting half of the loss, there is still a lot of power, and it never stops, and the speed is extremely fast, which is enough for grinding flour.

Chapter 67 Sunny Day

A foot-long force measuring stick was stuck at the bottom, and a rope was tied to let 40 people hold it, and all the sails were opened.

The expressions of the forty people gradually changed. Although the windmill didn't turn, they were amazed by the force coming from the rope.How could the wind have such great strength?

From back to front, they let go of their hands one by one. When there were more than a dozen people left, they finally couldn't hold the rope, and never dared to underestimate the power of these linen and wood.

Chen Jian yelled to stop, and everyone let go of their hands together. The windmill made a creaking sound and turned quickly.

The strength is about the same as Chen Jian estimated. He doesn't have an encyclopedia in his mind. When the windmill turns, the only thing he can thank is the nine years of compulsory education and three years of high school study in his previous life.

The elementary school teacher taught him that one cubic meter equals one thousand liters; junior high school chemistry taught him that the average molecular weight of air is 29, and high school chemistry taught him that one mole of gas under standard conditions is 22.4 liters.So it can be calculated that the density of the air is 1.29 kilograms per cubic meter, and then the theoretical power of the windmill can be estimated.

Junior high school physics taught him the principle of leverage and the relationship between torque, so he can estimate the size of two sets of wooden gears after making the stone mill, in order to achieve the fastest speed.

Geometry in junior high school taught him to use a compass to draw a circle, and taught him how to use a ruler and compass to bisect an angle, so he can splice out wheels and drill out the round holes of windmills.

Now that the windmill has started to turn, the stone mill is not ready yet, and there is no rush to install it.

The stone mill is not flat, the bottom of the stone mill has spiral patterns, so that the wheat can be ground and slowly driven to the outside of the stone mill by using the spiral patterns.

A lubricated idle stone mill without wheat grains will make the spiral pattern disappear.

However, the wind cannot be wasted in vain. A rough fixed pulley was cast with bronze, which cannot save effort, but can change the direction of force.

Placed on a cliff, a simple winch was made with wooden gears and ropes.

When a slaughtered sheep and a large pot of salt were easily pulled up to the cliff by the winch, people in the city ran to the top of the mountain to see this windmill, and were amazed at the windmill that could lift three or four hundred windmills without pulling. Winch for heavy loads.

The slaves working in the fields watched and worshiped the windmills turning on the top of the mountain. This tribe could even be driven by the wind.

More and more people went to the top of the mountain to watch the excitement, and when the drums sounded in the city at noon, they were even more crowded.

The harvest is less than a month away, and after the harvest, we have to be busy with planting. It is difficult to have such free time until winter.

Thinking that the people of the Tian clan have been eating badly, and they cook wild vegetables and mixed fish with acorn noodles every day, Chen Jian simply turned this bustle into a gathering of urban villagers, slaughtered a few rams, and hung them up. Several baskets of fresh fish and dozens of sacks of charcoal.

Under the rotating windmill, the brick-and-stone oven was set up, and a group of more than a dozen people brought all the little wine left over, counting it as the last relaxation before the harvest and busy work.

The smell of burnt meat pervades the top of the mountain, and the offal of the sheep is distributed to the slaves, who are asked to cook a pot of soup to fill them up today.

There wasn't much wine, so Chen Jian poured out two cans, mixed the rest with sugar water, and distributed them.

Many people stared at the two cans of spicy wine greedily. They don't like wine mixed with water, it has no taste at all.

Chen Jian pointed at the two cans of wine with a smile and said: "I want to drink these two cans of wine, I will ask a question, whichever two get the right answer first, this wine will belong to."

The clansmen put down the roasted dried meat in their hands, calmed down, and listened with their ears sideways.

Chen Jian held up a leg of lamb and said, "Since we are eating sheep, let's ask a question about sheep."

"Well... there are twelve sheep and geese in total, but they have 28 legs. Tell me, how many sheep are there? How many geese and geese are there?"

As soon as the words were spoken, those people who were hungry for alcohol all sat down sullenly, with helpless expressions on their faces.

Lancao covered her stomach, pointed at the civet cat who had just recovered from a serious illness with a smile and said, "Think about it quickly, my brother said, after the two of us have a faint ceremony, we will build a house for the two of us. It's ours."

The civet cat said with a gray face: "How can I, I can only count to a few thousand by counting."

Everyone around laughed, knowing that they couldn't think of it, so they simply didn't want to, gulping down the light wine mixed with water, silently thinking that the two cans of wine must have turned sour, and it might not necessarily turn into vinegar...

Suddenly, a woman's weak voice came from the lively crowd.