Organic Farm Author: Farmer is flying

Chapter 191: Making a Bow and Arrow

Tian Chuan and Tian Wenming came to his house. The courtyard of Tian Wenming's house is divided into two parts, the inner courtyard is no different from the ordinary farm yard, and a shed is built in the outer courtyard, in which the farm vehicles he uses to collect timber are parked. On one side of the outer courtyard, two large stacks of various timbers were piled up. Some of the less common pieces of wood are placed on the inside of the two stacks, and one by one is placed next to the wall.

The jujube wood and mulberry wood in Tian Wenming's mouth are here. Tagawa fell in love with these three pieces of wood at a glance and immediately said that he wanted to buy them. Tian Wenming said that he didn't spend much money at the beginning, and resolutely refused to accept the money. In the end, Tian Chuan still threw him 200 yuan.

Tagawa wants Kuwaki to be used to make two bows to play. He saw that the two mulberry trees were relatively uniform and straight, and the thickness was just right, so he immediately asked Tian Wenming to use a chain saw to cut the two pieces of wood to a length of about one and a half meters. The jujube wood is slightly bent, there are some wood nodules on it, the diameter is nearly 30 centimeters, the length is nearly one and a half meters, this jujube wood is going to be used as a self-defense stick, after cutting it in the future, some can be left for other purposes.

After bringing the wood home, Tagawa took a closer look and found that the three pieces of wood were all old and had dried out and could be used immediately. There is a longitudinal crack on one of the mulberry trees, and from the direction of the crack, the wood grain is straight and there is no twisted flower, which is a good material for making a bow.

In order to make the bow, Tian Chuan has been preparing for a while, except for the bow body material, he has almost prepared everything else, and now with these two mulberry trunks, he can make it by hand.

Tagawa started working on the same day, first sawing a 10-centimeter-deep hole in the diameter of the end of the wood with a saw, and splitting the whole log in half. Then use a few chisels to drive them into the sawed holes, and crack the holes in the wood.

He sawed a section of jujube tree branches with a diameter of six or seven centimeters from Tian Wenming into a 15-centimeter-long section, and then sharpened them into wooden wedges with flat heads, which came in handy. The wooden wedge is driven into the crack on the trunk of the mulberry tree, and the crack is further propagated. The wooden wedges are then driven into the cracks until the whole log is finally split in half.

Then, in the same way, divide each half of the mulberry trunk into two halves. He picked up a quarter of the mulberry trunk and looked at it, feeling that he could divide it again, so he split the piece of wood in his hand in half again, and was basically satisfied.

He cleaned the bark on the wood, and then used a machete to remove the core part of the wood in the middle, and obtained a piece of mulberry wood with a width of 8 centimeters, a meter and a half long, and a thickness of nearly 3 centimeters. In the future, the smooth original wood scalp is the bow back, and the slightly softer wood core is the inside of the bow.

Tagawa used a marker pen to draw the outline of the width of the bow on the scalp of the wood, and then slowly cut off the excess wood with a machete and a planer, and the prototype of a bow that was wide in the middle and narrow at both ends gradually took shape.

The next step is to trim the thickness of the bow. Determine the position and shape of the middle grip first, leaving it thick to withstand the thrust of the bow. So here the thickness of the trimmed is up to 3 centimeters, and for ease of holding, he trimmed it slightly narrower

The width of the bow. Starting at the ends of the grip, the thickness of the bow body gradually thins along a transitional arc. After a transition of seven or eight centimeters, the thickness is reduced from three centimeters at the grip to less than 1.5 centimeters, and the bow arms along both ends continue to thin until it is about 0.8 centimeters at a distance. At the ends of the bow at each end, a thicker part of about 6 cm in length was retained, which was used to hold the bowstring in the future.

After the basic shape is almost trimmed, the bow arm with a rectangular cross-section shape is rounded, the fillet on the back side of the bow is relatively small, and the fillet on the belly side of the bow is much larger, so that the cross-sectional shape of the bow arm changes from the rectangle at the beginning to the shape of the chestnut cross-section, and a bow is almost complete. When trimming the shape of the bow, he tied a substitute for the bowstring made of paracord to the bow body every once in a while, tried to pull it, felt the strength of the bow, and observed the deformation of the bow arm when it was pulled, and decided the amount of cutting for the next trimming. The bow arm tapers from the grip to the point, and the amount of deformation changes gradually when it is pulled out. The smoother this transition is, the more uniform the future power will be, the more stable the arrows will be, the greater the power of the arrows, and the longer the life of the bow.

After the shape of the bow body was trimmed, Tagawa made a bow tamer from the wood leftover from the renovation of his home. The so-called bow tamer is actually a square piece of wood with a side length of nearly 10 centimeters (a round shape is also acceptable), and the length is nearly one meter. He made a V-shaped notch at the end of the wooden square to hold the grip of the bow. Then, 40, 50, 60, 70, 80 cm from the notched end of the side of the wooden square, a barb-shaped notch is made for hanging the open bowstring. Finally, clamp the finished bow tamer vertically to the vise, so that the end of the V-shaped notch is facing up.

He then used a double-strand paracord to make a bowstring and gently folded the bow to make it truly the shape of a bow. Then place the grip in the middle of the bow body on the notch at the end of the bow tamer, then pull the bow with both hands and hang the paracord as the bowstring on the first notch below, so that the bow remains in this open shape. After maintaining the shape of the bow for an hour, the bow is stretched widely, and the bowstring is hung on the second gap, so as to gradually increase the width of the bow, and through the effect of stress relaxation, the bow body is adapted to this state of being stretched, so as to avoid damage to the bow arm caused by the force of sudden opening and archery.

After taming the bow, Tian Chuan held the bow in his left hand and pulled the bowstring with his right hand, feeling the power of the bow, and estimated that with his own arm length, when the bow was full, the pulling force was about 80 to 90 catties. This kind of strength is not too great for him, and he can easily open the bow many times in a row. He was generally satisfied with the first bow he made, but he still made a few mistakes in the process, and it would have been better if he had made another one.

Tagawa removed the paracord from the bow, which was used as a bowstring, carefully trimmed the surface with a knife, sandpaper the bow body was smoothed, and finally applied tung oil to the surface to prevent the force from changing after moisture absorption. After the tung oil is coated, it is necessary to wait for it to dry, and then apply it, after many times, it is not only moisture-proof, but also can increase some tensile force.

Before applying tung oil for the second time, Tagawa wrapped a layer of silk thread around the grip to increase the friction during the grip and make it easier to hold the bow. At the same time, the bow arm on both sides was written with the material of the bow, the time of production, and his own signature, this bow was named by him Light Feather, if it was used as a hunting bow, it should be used to hunt small and medium-sized beasts such as hares or yellow sheep. Because the power is still a bit too large, if it is used to shoot an air target in flight, it may cause the arrow to fly too far and may accidentally injure others, which is not good. If you want to hunt birds in the air or in the trees, you need to use a bow with less power and special arrows. This kind of special arrow slows down quickly during flight, and after flying a certain distance, the speed will drop significantly, and it is not easy to cause accidental injury.

Prior to this, Tagawa had already prepared the materials for making arrows. There are three types of arrow shaft materials, one is a birch pole, one is a bamboo pole, and one is a carbon fiber composite rod. These are all commonly used arrow shaft materials, and he is going to try them all and choose one of the most suitable ones.

The birch pole is made of lumps of wood cut into thin strips and then turned into a round, and special attention is paid to the texture of the tree when processing, which is smooth and straight, and it is very convenient to use. Birch rod processing is the most convenient, but the strength is uneven, easy to cause accidents, can only rely on the method of increasing the diameter to improve safety, the air resistance in flight is large, the accuracy is relatively poor.

The bamboo pole is a kind of thin bamboo pole that is almost solid, and the strength is much higher than that of ordinary bamboo, but the weight does not increase much. He carefully selected the bamboo poles he bought, and the bamboo poles selected were all about the same size. In order to correct the bending deformation of the bamboo pole, it was straightened after soaking in water. The high strength and small diameter of the bamboo pole are its advantages, but they are generally not too straight, and there are always various subtle differences between different bamboos, which will also affect the shooting effect.

The carbon fiber rod was made with the help of Zhu Dacheng, who makes fishing gear. It is rolled with a high count of satin carbon cloth and put into a mold, and then injected with liquid epoxy resin at high pressure and then cured, paying special attention to the ratio of axial and radial fibers to achieve maximum strength and stiffness. The dimensional consistency is very good and the strength is the most uniform. Carbon rods are not traditional materials, but they are the lightest, have good consistency, and are the easiest to control. But in the event of a fracture accident, the consequences are the most serious. In his previous life, Tagawa had seen a photo on the Internet of a porcupine-like shot of a broken and exploding carbon fiber arrow shaft after shooting through the archer's archer, and it made people shudder to think about it.

Tagawa calculated the force on the shaft during firing and tested the strength of several materials used to make the shaft, proving that the strength of these materials could meet the requirements of use. This is not nitpicking, but a real concern for your own safety. It is important to know that if the strength of the shaft does not meet the requirements when shooting, it will cause the shaft to be inferred by the strong thrust of the bowstring, and the broken back half of the shaft may hit the forehand holding the back of the bow, causing serious injury. It is precisely for this reason that several types of Tagawa's arrow shafts have chosen several times the safety factor to ensure safety.

Another key component in crafting arrows is arrow clusters, also known as arrowheads. There are three types of arrows he used, all of which were made of steel. One is the most common cone-shaped arrow cluster, one is triangular with three longitudinal blood grooves, and one is more special, similar to a diamond, with two sides in front and more than 2 cm wide at its widest point, which is intended to be used as hunting arrows to hunt large animals.

From an aerodynamic point of view, the conical cluster of arrows has the best stability when flying, the triangular shape is slightly worse, and how the last one will fly in the end, can only be hehe.

But from the point of view of the killing effect, he is most optimistic about the triangular arrow cluster with a blood groove, and the invasion effect on the target should be the best. Although diamond-shaped arrow clusters can cause huge wounds, the possible depth of penetration is unpredictable due to the high air resistance during flight and the lack of kinetic energy when hitting the target (if it can be hit). As for the conical cluster of arrows, the resistance when piercing is not too small, and the damage caused may only be a small hole, and if it is not lucky enough to hit the vital point, the prey may run away.