The course schedule is loose, with only five classes in total every day. Most students only need to participate in two of them. Anna has two bilingual classes and one senior mathematics class. Li Xiang also has three classes because he has to work part-time as a one-hour teacher.
Two and a half teachers teach a dozen or so students with low intensity. The teacher-student ratio is quite good and it is not very hard.
There are eight days a week, six days of study and two days of vacation, so there is no delay in taking Li Xiang out for sketching.
Apart from studying, the remaining things in winter are the renovation of two RVs and the application of jellyfish wood to Stone Girl Roots.
When we came back from the lake, half of the RV modification was completed, and the rest was stopped halfway to wait for the jellyfish wood to be in place.
Now the jellyfish trees are placed in the backyard and covered with breathable sheets to dry.
These wood have been sawn in half and meat removed by the lake. The overall drying difficulty has been reduced. There is a large furnace and charcoal making furnace in the courtyard. The ambient temperature is high and the progress is relatively fast. In order to maintain uniform drying, it is still dry after occasional inspection. They need to be sprayed with water to moisten the surface.
After returning from the lake for more than a month, the change rate of jellyfish wood has reduced to a level that is difficult to visually detect, and it is basically mature.
According to measurement calculations, the density of jellyfish wood after drying is 0.48, that is, 0.48 tons per cubic meter, which is 20% lighter than dry oak. It has not yet reached the snowmelt period, and it may decrease in the future. However, after an extrusion test, the change rate is not felt will be greater than 0.02.
This situation was not noticed when the renovation was stopped. At that time, the complete renovation of the wooden board part was stopped only because the raw performance of jellyfish wood was better than that of oak and it was expected to be made into frosted glass.
It may be due to the difference in cell wall composition and cell structure. Although dried jellyfish is 25% lighter, it even performs better than oak.
For example, in the breaking experiment, wooden sticks of the same thickness and length were placed overhead, and an iron ball was used in the center to exert downward pressure on the contact object. The stress of jellyfish wood before breaking was 15% higher than that of oak wood. In the tensile test, the gap is even larger, reaching 30%.
But there are also weaknesses.
For the puncture resistance test, aim a nail at the wood, drop an iron ball of the same size at the same height and hit the same type of nail to check the depth of the nail penetrating into the wood. This experiment is based on the difference in the final penetration of the nail into the wood. Do eight consecutive groups. The maximum and minimum values are calculated by taking the average of the middle, and oak wins by 8%.
To put it bluntly, jellyfish wood needs to be 8% thicker to achieve the same anti-arrow and spear-throwing effect as oak.
At this point in the experiment, it was decided that the new RV would be completely replaced with jellyfish wood.
It is easy to adjust the thickened plate, but there is still one problem that needs to be solved.
Jellyfish wood has a milky texture after drying. Although the transparency is lower than when the wood is raw, it still transmits light. The amount of radiation in the polar summer is very high, and it is difficult for the RV to transmit light as a whole.
So most wood needs a way to block light.
The easiest way is of course to directly add veneer panels. I used the blacksmith shop’s bulletin board to purchase them for a while. Until the snowmelt season began and the number of ghosts in the city gradually decreased, I could only find enough to cover the floor and a few veneer panels. The number pattern is inconsistent and is used as a bedroom finish.
There is still a large chunk of the top of the wall to work on.
As the snowmelt season begins, and it will take another two months to wait for the muddy period to pass, we adopt a simpler method, carbonizing the surface.
The process of wood board carbonization is very simple. Bundle several boards together and stand them up. Use charcoal fire to grill one end in a non-contact manner. Smoke will emit from the gap at the top of the bundled wood for a period of time, or an open flame will appear. After unfolding, you need to scrape off the excessive carbonization. Part, if the skill is not good, you need to cut off part of the grilled end.
As an architect in the industrial age, Wang Qi has never personally performed the carbonization process. He has to stay on site to make adjustments at any time to minimize the loss of wood thickness.
The surface of wood that has been carbonized will gain anti-corrosion, moisture-proof, and surface hardness buffs. The wood grain will have a higher contrast in dark colors, and it will be easier to create a smooth feel, so you can save the veneer.
Carbonization cannot be used on the floor because the wear-resistant properties of the floor are more important and conflict with the carbonization results.
As the ghosts gradually disappeared and without the guests, the blacksmith and the Eight King Kongs were able to focus more on the RV project, and finally completed all the work within a week of the end of the snowmelt season.
It's called a renovation, but it's actually like rebuilding the RV.
There are no cities to the west from Yabur, and the RV needs to transform from a travel tool into a true mobile campsite.
Due to the blacksmith's skills and complete materials, many things could not be made, so he had to enlarge the RV.
The outer width cannot be increased from 2.4 meters to 2.5 meters, because 2.5 meters is the width of a city bus. The road conditions going west are even more severe. There are no serious load-carrying transportation lines. Mindlessly widening the traffic capacity will cause big problems. , 2.5 meters may require frequent stops to cut down trees.
There is no room for width, so it can only be lengthened. The length of a large RV increases from 7 meters to 10 meters. If you add more, it will really become a bus.
When there is a conflict between traffic power and comfort, traffic power has a higher priority. Wang Qi does not intend to add more attributes to the Eight King Kongs to prevent them from being too floating.
It is 10 meters long and 2.5 meters wide, with double-storey bedrooms at the head and tail. Using 7 cm thick oak to make such a box weighs 4.2 tons. With this weight and the extended outer frame, there is not much leftover for internal equipment and material storage.
In order to create more space and room for additional protection, the original plan had to use 5cm thick wooden boards in addition to the floor and doors, which could save a full ton of weight.
Now the entire car is made of 7cm thick jellyfish wood, and the car weighs only 200 kilograms more than the 5cm version. The protection and heat insulation provided by the extra two centimeters of wood are enough for people to make the right decision.
A two-centimeter wooden board, taking oak as an example, should be 2.5 meters long and have a certain width so that people can walk in the air.
The RV frame does not have such a large gap. The 2 cm thick wooden floor is enough for a bunch of people to run around on it, and the single point load can reach more than 150 kilograms.
The wall is 5 cm and 7 cm, which is the difference between axe-proof and bear-proof. Coupled with the metal protective frame, bears under one ton are unlikely to pose any threat to the interior.
After the RV is enlarged, the weight of one ton to repair the protective board can only be a layer of iron sheet, which has no protection at all and is not as good as two centimeters thick wood.
But Wang Qi still managed to enhance the protective power of the outer frame.
The solution is not to use board protection, but to use 1 mm steel strands to distribute the force to the outer frame and reduce the damage to the board.
Using a 1mm steel strand as a trap can cut off a section of a running horse's neck. It is also possible to cut off the entire horse's head without the skin.
The style of the steel strand grid plus the metal frame is very strange. Wang Qi has calculated that this is the solution that maximizes the use of the frame's protective power and the lightest total weight. The entire car frame is covered in mesh, with a wire spacing of three centimeters, and weighs only 240 kilograms. Part of it is reinforced with 3 millimeter stranded wires and will not exceed 300 kilograms.
When the finished product comes out, the total weight of the large RV excluding material storage has exceeded 7.5 tons, and the operating weight will be close to or even exceed 9 tons. It seems that the new attributes of the Eight King Kongs are already indispensable.
The new version of the large RV also adjusts the structural relationship between the frame and the wooden boards, using mortise and tenon grooves and I-shaped aluminum alloy materials to embed them together to ensure strength while gaining space millimeter by millimeter.
In the version that finally landed, the distance between the inner wall of the wooden board and the outer defensive steel strand was 8.8 centimeters. Considering the processing accuracy, it could only be calculated as nine centimeters.
The practical internal width of the new car is 2.32 meters, which is 2.2 meters wider than the previous version with an external width of 2.4 meters and an internal width of 2.2 meters. The 2.5-meter version has an additional 2 centimeters internal width with thickened wooden boards.
2 centimeters may seem insignificant, but when placed in a car with a length of ten meters, the total available space is 0.4 cubic meters more. When a burial coffin is put in, there is still more... well, multiple large refrigerator spaces.
The new configuration has two bedrooms at the front and rear with an internal height of 1.35 meters. The length of the bedrooms remains 2.4 meters, as does the front bedroom. With an internal width of 2.32 meters, one bedroom can still sleep three people at the same time and remain relatively spacious.
Each bedroom has a larger cabinet to store personal items. Depending on the number of guests, some are on the side and some at the head and tail. The smallest bed in the four bedrooms is 2 meters x 2.1 meters, with a movable partition in the middle. .
The 12-square-meter main space has also been fully upgraded.
The previously modified four-seater dining table was canceled. During the first half of the trip, it proved that after the thing was raised and lowered, the narrow double bed it turned into was not comfortable at all and was a bit short.
The new version has all been changed to small tables and chairs stored on the wall. There are four sets in total, which can seat eight people at the same time to eat and brag.
The storage cabinet was changed to a wall cabinet close to the roof of the car. It is a bit like the luggage rack of a civil aviation airliner. It is slightly inconvenient to access, but the storage space has actually increased several times.
The 12 square meters on the ground become clear space, and all the people in the next row can sleep on the floor bunks!
Of course, there are some problems with sleeping so intensively, and no one who is awake can move.
Finally, there is the ultimate move, a transformation mechanism that can only be used while camping.
From the front of the car door to the front bedroom door, the car body can be pulled out, just like the drawer. Then pull down the two wooden boards on the car roof that are used as sliding doors, and then secure two 3x0.9 pieces for the inside of the car, totaling 5.4 square meters. Extra space!
When the main space is not in the camping state, the deformation mechanism is partitioned, and the width of the passage is 0.55 meters, which is about the same as the bathroom door. It is not convenient, but the two lower bedrooms at the head and tail can be opened from the outside without affecting the use.
The most difficult process of the whole car is also the several boards of the deformation mechanism. They are also made of angle steel and X-shaped aluminum profiles. The wooden boards and the frame are completely integrated together. The wooden boards cannot be installed on the ready-made frame and must be completed in a special order.
Due to precision reasons, there is a two millimeter gap in the deformation of the finished car. Our skills are really difficult to handle. When unfolding in winter, we have to use mud to cover it to ensure the temperature inside the car. We don't need to worry about it at ordinary times.
The total area available for camping with the new car reaches 40 square meters, that is, with a length of 3 meters, a width of 10 centimeters, and an additional load of more than 3 tons, the total area is almost doubled. There is even a twisted wire net and an additional two centimeters. The thickness of the wood board is to comprehensively enhance the vehicle body defense.
After the large RV was completed, a group of people moved in and began to adapt to the feeling of living together in a small space in advance. At the same time, the finishing touches were put on the renovation of the small RV.
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