The water rocket is a toy designed based on the effect of mass ratio and air pressure. It is also a case study in physics teaching, which can cultivate students' interest in learning physics. The physical principles it contains are an important foundation for understanding mechanics in physics.
Water rockets are also known as pneumatic water-jet rockets or water propulsion rockets. It is made from discarded beverage bottles to create the power cabin, arrow body, arrowheads, tail wings and parachutes.

KX1918 Fire and Water Arrow Set (Medium Size)
KX1919 Fire and Water Arrow Set (Large Size)
KX1920-A Water Rocket Set (Complete Set)
KX1920-B Water Rocket Kit (Launch Pad Pump)
KX1920-C Water Rocket Kit (Launch Pad)
KX1920-D Water Rocket Set (Pump)
KX1920-KX805 threaded nozzle
KX1920-PJ8 large rocket head
KX1920-PJ9 rocket head medium

Rocket head: Specification
Large rocket head: 105*105*120mm, suitable for 1.25L and 1.5L cola bottles and Sprite bottles
Medium-sized rocket head: 75*75**110mm, suitable for 450ML and 600ML cola bottles and Sprite bottles
Small rocket head: 25*25*67mm, suitable for tubes with a diameter of 2.05

 

 

 

  

Rocket head: Specification
Large rocket head: 105*105*120mm, suitable for 1.25L and 1.5L cola bottles and Sprite bottles
Medium-sized rocket head: 75*75**110mm, suitable for 450ML and 600ML cola bottles and Sprite bottles
Small rocket head: 25*25*67mm, suitable for tubes with a diameter of 2.05

Streamlined design reduces flight resistance while enhancing aesthetics.

2. Move the center of gravity of the water rocket forward to maintain its balance and directionality during flight without the need for additional counterweights.

3. The water rocket falls from a great height, providing maximum protection for the rocket body.

Usage method: Put it on the bottle. If necessary, cut off a part according to the size of the bottle

To reduce weight, it is reinforced by winding with electrical tape.

Regarding bottles: Suitable for mainstream carbonated water bottles on the market, including: Pepsi-Cola (recommended), Coca-Cola, Sprite, Fanta, Mirinda, 7-Up, etc. Do not use mineral water bottles

1 Overview of the Rocket
Water rockets are also known as pneumatic water-jet rockets or water propulsion rockets. It is made from discarded beverage bottles to create the power cabin, arrow body, arrowheads, tail wings and parachutes. Fill in three parts of water, use a pump to inflate air to a certain pressure and then launch. It is a model of a rocket that uses the mass ratio of water to air (the density of water is 771 times that of air). Compressed air sprays water from the nozzle at the tail of the rocket at high speed downward. Under the reaction effect, the water rocket rises rapidly, glides in the air with acceleration and inertia, and has a flight path like a missile. After reaching a certain height, it slowly descends by opening a parachute in the air.

The water rocket is a popular science textbook that combines education with entertainment, has a high technological content, and is deeply loved by a large number of teenagers. It is both hands-on and brain-stimulating. It enables students to have an intuitive understanding of the launch, ascent and recovery processes of missiles and carrier rockets, as well as the flight principles and differences between missiles and aircraft. Explain Newton, the second and third laws (inertia, the law of conservation of energy, action and reaction), and understand some basic knowledge of aerodynamics and flight mechanics, etc. Enable the majority of young people to understand and love aerospace technology, and cultivate, bring up and supply talents for the aerospace industry. (Competitions have been held many times across the country ~~

2. Emission Principle

A bottle tightly sealed with a rubber stopper forms a closed space. When gas is injected into a sealed container, the air pressure inside the container increases. When it exceeds the maximum degree of connection between the rubber stopper and the bottle mouth, the bottle mouth and the rubber stopper freely separate, and the water inside the arrow is sprayed backward, obtaining a reaction force and being ejected. The major difference between a water rocket and a rocket lies only in that the medium for propulsion in a water rocket changes from high-temperature air to water. Before launching a water rocket, air is injected to a certain pressure. As high pressure naturally flows towards low pressure, when the nozzle is opened, air naturally flows towards the nozzle. However, since water blocks the front, the water is pushed out of the rocket by the air, and the rocket thereby gains forward speed.

3 Rocket Manufacturing

Material preparation

2 to 6 2.25L cola bottles, scissors, single-sided blades, cork stoppers, ball syringes, ballpoint pen refills, staplers, double-sided tape, and colored decorative paper. Lightweight and airtight materials such as tablecloths

Production process

1. Making of the booster stopper: Use a small knife to cut off the thicker end of the rubber stopper, with a diameter of 2.3cm. Pass it through a small hole, install the valve core, rubber hose, and nut, and forcefully insert the rubber stopper into the bottle mouth. The part exposed outside the bottle mouth should not exceed about 2mm. Use scissors to dig a hole with a diameter of about 12mm in the middle of the beverage bottle cap so that only the valve core is exposed when the cap is tightened.

2. Preparation of the side wings: Cut four side wings from hard paper. To ensure good stability of the rocket during flight, the side wings must have high hardness. If the paper is not hard enough, two or three pieces can be stacked together for preparation. After cutting the side wings, alternately fold the "adhesive claws" back to both sides and symmetrically stick them to the lower side of the rocket with transparent tape.

3. Take out one of the cola bottles and cut it into three equal parts approximately one-third apart. As shown in Figure 2, leave the bottle mouth and the middle section, and turn the second cola bottle upside down. As shown in Figure 3, cover the bottom of the second cola bottle with the mouth of the individual, and then cover the middle part of the individual with the mouth of the second cola bottle. After covering it, stick it tightly with double-sided tape. Find another cardboard and cut out the balance wings. The number of balance wings is 4. A balance wing that is too large is very heavy, while one that is too small cannot play a balancing role.

4. To make a parachute, fold a square tablecloth along one side, then fold it along the other side again. With the center point as the center, fold it twice. Use scissors to cut off the excess part to make it round and stick the string on. Prepare the materials. Three or four 2.5-liter Jianlibao bottles or cola bottles, several X-ray films, a few No. 3 and No. 4 soft rubber stoppers for chemical equipment, a complete set of bicycle valve cores, one pair of scissors and a small knife, transparent tape, double-sided tape and insulating tape, and one bottle of 502 glue.

The second production method: 1. Wing production. Use scissors to cut the X-ray film into 28 right-angled trapezoids of the same size. The trapezoids are 12cm long and 6cm high, with the Angle between the inclined waist and the long base being approximately 45 degrees. Cut another 4 trapezoids of the same specification but 8cm in height, with short bases connected and two overlapping sides (used as the surface of the wing). Use double-sided tape to tightly stick 7 small trapezoidal pieces into a thick trapezoidal shape, making it straight and flat. Then, tightly wrap and stick it with a large double-sided trapezoidal piece. To make the thick surface of the wing smooth, it can be flattened and straightened with scissors or a small knife, and then the thick surface of the wing should be sealed with insulating glue. Then, fold the protruding parts on both sides of the wing outward at a 90-degree Angle. In this way, the remaining X-ray films are made into three machines according to the above method. 2. Body manufacturing. Take a Jianli bottle (the arc transition of the bottle head is relatively natural, and using it as a rocket head is beneficial for reducing air resistance), cut it horizontally 11cm from the lower end, and use insulating glue to stick the part with the bottle mouth tightly to the bottom of the other bottle. Wrap the insulating glue several times around the interface to make it firm. 3. Air plug manufacturing. Take a No. 4 soft rubber stopper, and use a hole-making tool to make a straight hole slightly smaller than the valve core sleeve at the center of the bottom of the stopper. Then, use a small knife to cut off the fine end by about 0.6cm. Put a large "ring" (available at hardware stores) on the valve core sleeve, install the valve core from the thin end of the soft rubber stopper upwards, put on another similar "ring", tighten the screws slightly, and it's done. Then, grind the air plug into a cylinder with a whetstone until it can just fully enter the mouth of the cola bottle or be slightly tight. Install the valve core and it is ready for use. 4. Gun head production. Take a No. 3 soft rubber stopper and sharpen it with a knife to make it smooth. 5. Assemble the wings. Take a Jianli Bao bottle and cut out a cylinder on both sides that is slightly longer than the wing. Then, use transparent tape and insulating tape to tightly bond the four wings in four equal parts. After that, place the cylinder with the wing attached to it on the bottom of the water rocket so that it is level with the bottle mouth (this may not be the best position and can be determined by adjusting it up and down during flight practice), and then wrap and stick it tightly with insulating glue. 6. Others. To increase the contact surface between the air stopper and the bottle mouth and raise the internal pressure of the bottle, a small knife can be used to cut the large end of the air stopper a little thinner and make it round, flat and rough. As the fuselage has an additional section for the rocket head, the rocket head part is relatively light and unbalanced. You can appropriately stuff paper inside to achieve balance. To minimize air resistance as much as possible, the gun head made of a soft rubber stopper is glued to the mouth of the rocket head bottle with 502 glue. A simple water rocket is made by following the above method. Based on the water rocket we developed, through practical improvements, it can fly up to about 160 meters horizontally and 40 to 50 meters vertically.

Water rocket launch method: 1. Water volume control. The water consumption of a water rocket has a certain proportion to the rocket's gas capacity. It should neither be too much nor too little. The optimal water consumption is approximately between 1/4 and 2/5 of the rocket's gas capacity (about 600 milliliters can be held in a 2.5-liter space. You can conduct several tests to determine the exact amount).

2. Launch Angle. For horizontal flight, due to air resistance, the optimal launch Angle is between 50 and 55 degrees. Different water rockets may have different angles, which can be determined through experiments by controlling variables. The optimal Angle of the water rocket we made is around 53 degrees. Vertical flight is 90 degrees.

3. Use of air plugs. The principle of using an air plug is to adjust the tightness of the air plug by compressing the volume expansion of the soft rubber plug. The more severe the compression, the greater the volume expansion, the tighter the air plug, and the greater the air pressure to be pushed out of the air plug, that is, the greater the power the rocket gains. The specific usage method is as follows: Remove the valve core of the air plug, insert the air plug into the bottle mouth of the rocket in its original shape, then use a socket (a special tool for tightening screws, available in hardware stores) to tighten the screws of the air plug, and finally install the valve core to fill with air for use. (Note: The tightness can be adjusted as needed.)"

4. Stable launch control. Only discuss the launch in the horizontal direction. A launch pad needs to be made. The launch pad should be equipped with a navigation track. The navigation track should neither be too long nor too short, generally 60cm in length (it can be made up of three large teaching triangles and two broom handles. To reduce the friction on the water rocket when the broom handle is used as the navigation track, the broom handle can be stuck with transparent tape or a model as shown in the legend). When there is no wind, launch directly at the target at the optimal launch Angle (referring to the Angle between the launch orbit and the ground). When it is windy, the direction of the launch target should be appropriately adjusted according to the wind force and direction to maintain the optimal launch Angle.

5. Precautions. When launching, ensure that the rocket is straight and consistent with the orbit. A deviation of 1 to 2 degrees will affect the stability of the flight and cause it to fly in an "8" shape. When inflating with an air cylinder, try to do it as smoothly as possible. The inflating frequency should not be too slow but rather fast. The air stopper should be tightened as much as possible. This can be adjusted by tightening the screw of the air stopper. The tighter the air stopper is inserted, the greater the pressure inside the bottle will be and the greater the power of the rocket will be. Take A bottle and call it Bottle A. Draw a line at the 1-1 and 2-2 positions above and below the bottle respectively. The method for determining the positions of the two lines is as follows. 1-1: Select the part on the bottle where the curvature of the arc is similar to that of the rocket foam head. 2-2: Select about 0.5cm below the point where the curve at the bottom of the bottle turns straight.

Cut (cut) it with a utility knife (or scissors) about 0.5cm above line 1-1 and below line 2-2.

Trim it slowly with scissors to the marked line, trying to make it as flat as possible so that it can fit more tightly with Bottle B when connected. Place the rocket foam head above bottle A and check from directly above whether the foam head is in the exact center position of the plastic bottle. If it has been placed upright, wrap the joint with electrical tape and secure it. Take another bottle and call it Bottle B. Remove the cap and then screw the nozzle tightly through the opening of the PET bottle. Connect bottles A and B. Then roll it on a flat desktop or floor to see if the connection is flat and if the scrolling is smooth. If so, fix it with electrical tape. Take the third bottle and call it Bottle C. Draw a line at positions 3-3 and 4-4 on the bottle respectively. 3-3: Select about 0.5cm below the turning point of the curve above the bottle. 4-4: Select about 0.5cm below the turning point of the curve at the bottom of the bottle. Cut (cut) with a utility knife (scissors) about 0.5cm above the 3-3 line and about 0.5cm below the 4-4 line. Fold the thick cardboard in half and then draw four trapezoids with a pencil. Then cut along the line with scissors. Note: The size and shape of the tail fin can be modified in different ways to test its impact on flight. Also use slides to make trapezoids of the same specification as thick cardboard. Wrap the prepared slides around the outside of a thick cardboard trapezoid. You can first use double-sided tape to join the slides and the thick cardboard together, and then use electrical tape to cover all three sides. Stick double-sided tape to the bottom of the folded part. This step is to attach the four completed tail fins to the C bottle. Completed drawings of the four rear wings. Attach the four tail fins onto the C bottle, and make sure they are in a cross symmetry to achieve balance. First, stick the electrical tape on both sides of the rear wing. When sticking, make sure the length of the electrical tape is long enough. The upper part should be about one tape height higher than the rear wing, and the lower part should be folded back into the C bottle to increase the firmness. Then wrap about two turns of electrical tape around the top of the rear wing. Connect bottle C and Bottle B with electrical tape. Note: It is also necessary to keep the body of the water rocket straight to ensure the accuracy of the flight direction.

Key points of production

During the manufacturing process, the nozzle is of utmost importance. The seal must be good; otherwise, it cannot provide sufficient pressure. The air needle in the cork should also be airtight and impermeable to water. It is better to use a red-hot needle tip to Pierce the hole. If there is still water leakage, a ballpoint pen lead can be added to the air needle. The top of the ballpoint pen lead should extend beyond the water surface to prevent the bubbling of bubbles and water leakage when inflating. The strings of the parachute must be securely fastened; otherwise, excessive pressure may cause the strings to fall off the parachute body. [1]

4 World Records

It is 830 meters high and was created by several students from the University of Cape Town. The rocket has a peculiar shape and looks like a chopstick from a distance. It was designed by a professional team after multiple data collection, analysis and calculation, and is made of special materials on the outside. It is quite different from the traditional water rocket manufacturing process and concept.

5 Research Methods

The relationship between the vertical lift height of the water rocket and the water level inside the bottle

The relationship between the vertical lift height of the water rocket and the water level inside the bottle can be obtained through experiments: it is concluded through experiments that when the water volume is one-third, the water rocket flies higher. The experimental results show that air pressure is directly proportional to the range. This is because the greater the air pressure, the greater the force of the water spray, the greater the impulse of the water rocket, and the water rocket performs a recoil motion. When the water volume to be launched exceeds 1000ml, the water in the water rocket has not been completely sprayed out. Due to the decrease in air pressure, the acceleration stops, increasing the weight of the water rocket and causing it to fall prematurely under the influence of gravity. The greater the mass, the greater the momentum required to be provided. When the mass is constant, the greater the speed, the greater the momentum. The way to increase the speed is to raise the amount of water sprayed per unit time. Therefore, only when the air pressure and water volume inside the water rocket are appropriate can it fly farther and higher. It was found in the experiment that if the water volume exceeds the upper limit that a fixed air pressure can spray, the water in the water rocket will not be completely sprayed. How can we avoid the situation where the water cannot be completely sprayed? According to PV=nRT, the upper limit of water volume that can be sprayed at a certain air pressure can be calculated. If the water volume is insufficient, the water that can be sprayed out by a certain air pressure will be sprayed out earlier. According to theory, when launching, we first measure the maximum amount of water that can be injected into the water rocket, and then calculate the maximum amount of water that can be ejected at this air pressure. Based on these two data, water and air are filled, and the maximum range of the water rocket can be achieved (Pmax=Fmax×Mmax).

How to improve the stability of water rockets

During the ascent of a water rocket, it does not rise vertically; instead, it often ascends horizontally or sideways. This requires us to enhance its stability and make it rise vertically. To enhance its stability, the effect of atmospheric resistance must be taken into account. The top of the water rocket should be pointed to reduce air resistance. Secondly, the shape of the bottle body should be close to a streamlined one, which facilitates the passage of air flow. To make it rise vertically and also keep it upright when placed, we took a tripod and supported the water rocket (not a tight sleeve) so that it could stand upright.

The influence of the launch orbit on the range

Fixed water volume: 600ml, launch elevation Angle: 50°. Water rockets were launched respectively using a trackless launch pad and a 70cm launch pad, and the results and launch conditions were recorded. Compare the influence of the launch orbit on the flight distance. The experimental results show that the range caused by the same impulse of both track-mounted and trackless launchers is approximately the same. It can be seen that whether there is a track or not does not affect the range. However, when the impulse is smaller, water rockets launched by trackless launchers tend to deviate from the intended direction frequently. The orbital launcher, with its two fulcrum points, is less likely to generate component forces in other directions when the water column is ejected, thus enabling the water rocket to move in a straight line. Therefore, the rail-mounted transmitter is more accurate than the non-rail-mounted transmitter.

The influence of warhead weight on the launch orbit

The fixed water volume is 600ml, the launch elevation Angle is 50°, and a rail-mounted launcher is used. The warheads are placed with fillers in sequence, with masses of 30g, 40g, 50g and 60g. Compare the influence of warhead weight on the launch orbit of water rockets.

It can be known from the experiment that the warhead without the pre-filling material has a significantly rearward-centered center of gravity due to the influence of the tail fin mass. At this point, since the center of the object's rotation is the center of gravity, we can take the center of gravity G as the fulcrum. Then, under the condition of only being subjected to gravity, the warhead becomes a horizontal lever with G as the fulcrum. During flight, the warhead A and the tail B will be affected by the same wind resistance. However, due to the different lever arms (AG>AB), the moment generated at point A is greater than that at point B, so the water rocket will rotate and affect the course. So we must place the pre-filler to move the center of gravity G towards A, making the lever arm AG=BG (i.e., the midpoint of the water rocket), so that the moments generated by A and B will be the same and a balance will be achieved. However, if too much pre-packing is placed, the center of gravity will shift forward, causing the lever arm to AG

The influence of the launch elevation Angle

A fixed water volume of 500ml, pre-filled material, and a rail transmitter are used. Use the launch elevation angles of 35°, 45°, 55°, 65° and 75° respectively. Compare the influence of the launch elevation Angle on the launch distance of water rockets.

The oblique launch of water rockets is related to oblique ejection. Therefore, theoretically, it can be concluded that when the launch elevation Angle is 45°, the flight distance is longer. However, from the launch results, it can be known that a large range can be achieved when the launch elevation Angle is between 45° and 55° (approximately 52°). When the launch elevation Angle is too small, the upward component force of the water rocket is not significant, resulting in a small climbing height. Moreover, due to the weight of the water rocket being pulled by the Earth's gravity, it is prone to fall, causing a shortened range. When the Angle is too large, although the upward component force is large, the forward component force is too small, resulting in a too short range and creating a situation where "it shoots high but not far". Therefore, in terms of the launch Angle of water rockets, it is necessary to take into account the moderate upward and forward components, the influence of various external factors, and the launch elevation Angle.

6 Technical highlights

There are various types of water rockets, generally including single-stage single-thrust (one stage rocket with one thruster nozzle), single-stage multi-thrust (one stage rocket with multiple thruster nozzles), and multi-stage multi-thrust (multiple stages rocket with multiple thruster nozzles), etc. Multi-stage single-thrust is rare. Since single-stage multi-thrust is generally a "passive separation" of the thrusters (one or several bottles connected in series) and the rocket body and the thrusters are launched simultaneously, although there is a thruster ejection effect, it is generally not regarded as a multi-stage water rocket. The multi-stage and multi-thrust water rocket adopts the "active separation" technology between the thrusters and the rocket body, and the thrusters and the rocket body take over the launch. The technical highlights of water rocket manufacturing mainly include: nozzle technology, active separation technology and recovery technology.

The method of using inner tubes and air ports of bicycles as bottle stoppers is quite popular in China. However, since this method cannot well control the firing time, it is impossible to perfectly achieve multi-push. The transmitter ring was pulled down by pulleys and wires, achieving good control over the launch time.

Generally speaking, single-stage multi-thrust water rockets involve the issue of the thrust difference between the thrusters and the rocket body. Since it is a "passive separation" naturally achieved by gravity, the thrust of the thrusters must be greater than that of the rocket body to ensure that the two thrusters are combined and integrated when the water rocket is launched. When the thrust of the thrusters is exhausted, they will naturally fall off due to the effect of gravity. The main arrow continued to fly. The advantage of this type of rocket is that it does not involve complex multi-stage separation technology, has a relatively large thrust, and is relatively easy to manufacture. It should be noted that the diameter of the arrow body's nozzle should be smaller than that of the thruster's nozzle to achieve a thrust difference. Generally, parachute recovery technology is used for arrow bodies.

Now let's talk about the multi-stage and multi-thrust water rocket. This water rocket is huge in size and can even reach a height of over 200 meters. The highest known launch height was 864 feet, approximately 263 meters, set by foreign water rocket enthusiasts on October 30, 2010. Although the launch altitude of this type of rocket is not extremely high, it is more challenging and more favored by water rocket enthusiasts due to the involvement of "off-peak injection" technology, "active separation" technology and "staged recovery" technology for the rocket body and thrusters. The active separation technologies abroad vary in style, but their basic principles are the same. The active separation of the first and second stages is rapidly achieved by taking advantage of the gravity when the thruster thrust is exhausted, the spring force in the pre-embedded separator, and the ejection thrust of the second-stage arrow body at the beginning of the separation. The thruster section enters the descent stage and opens the parachute, while the second stage continues to rise until the thrust is exhausted and then descends to open the parachute of the second stage. If there is a third level, proceed in sequence.

Both single-stage multi-thrust water rockets and multi-stage multi-thrust water rockets can be made very large, but it is not difficult to distinguish the differences between the two. They can be distinguished by appearance. The single-stage multi-thrust water rocket (which can be called a false two-stage) has its body and thruster nozzles on the same plane, as only in this way can simultaneous launches be easily achieved. However, this is not the case for multi-stage and multi-thrust water rockets. Their second-stage nozzles must be connected to the thrusters because the second stage is not working at the start of the launch. So, you can tell just by looking at the position of the nozzle.

 

7 Extension Production

After getting familiar with the basic production of water rockets, one can attempt to make large and multi-stage water rockets. It is made of lighter metal and the air pressure is provided by an air pump.

2. Manufacturing of multistage rockets:

Tie several water rockets together and provide air pressure through an air intake hole. At the same time, water columns are sprayed out to enhance the flight capability of the water rocket.

After more than half a semester of exploration, research and experimentation, we have initially completed the development of the water rocket. From this, we have made improvements in many aspects. By searching for information, we have gained a very profound understanding of the development history of rockets, especially the history of rocket technology development in our country. Knowing that rockets are essential means of transportation for modern aerospace, China is the birthplace of rocket technology. However, due to a shortage of funds and technological deficiencies, the development of the aerospace industry has been very slow. But with the strengthening of comprehensive national strength, in cooperation with foreign countries, many "Long March series" rockets have been launched.

2. Divide one of the PET bottles into three parts; Leave the bottle mouth and the middle section

3. Place the remaining bottle mouth and middle section on the bottom and mouth of another PET bottle respectively, apply adhesive and fix them with insulating tape

ps: The body of the rocket must be kept in a straight line

4. Use thick transparent film or pearl plates to make four tail fins and evenly distribute and fix them on the fire
For the rear half of the water rocket, apply adhesive and secure it firmly with tape. Unevenly distributed or unfixed will affect the direction of the rocket's movement

5. Put on the fire arrow and nozzle, and get ready to spread your wings and fly high

6. Prepare for launch on the launch pad

 

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Zhejiang Jianyi Education Technology Co., LTD. (formerly Yifei Toy Factory) was established in 2007 and now uses the brands "TEACHER XING", "Teacher Xing" and "JIAN YI". After ten years of unremitting efforts, our company has gradually matured. Our company is a member of the Teaching Equipment Industry Association of the Ministry of Education and a key enterprise in teaching equipment in Zhejiang Province. We have been awarded the title of "Contract-abiding and Creditworthy Unit" by Jinhua City for three consecutive years. In 2014, we were honored as an "Advanced Collective in Jinhua's Teaching Instrument Industry" by Zhejiang Province.
Zhejiang Jianyi Education Technology Co., Ltd. is a high-tech enterprise integrating modern scientific research and development of educational equipment, course design, teaching resource integration and technical services. Zhejiang Jianyi Education Technology Co., Ltd. has established itself in the education industry with high-tech products and modern educational equipment. Its products are sold throughout the country and exported to Europe, America, Japan and South Korea. After years of accumulation, the company has taken shape. In terms of technological innovation capabilities, the company has professional designers engaged in the research and development of complete sets of scientific and educational products as well as the upgrading and replacement of existing products. In terms of production, management and installation services, the company strictly adheres to the standards of the ISO9001 international quality assurance system. In terms of marketing, "Teacher Xing" products have entered many provinces and cities in China and enjoy a good reputation. Over the years, we have provided the education sector with a series of high-quality, advanced and professional modern teaching equipment as well as professional equipment R&D and customization services. With excellent and high-quality professional talents, perfect after-sales service, product quality and the establishment of a good corporate image. The science and education physics series, chemistry series, solar energy, wind energy, geography, biology, art and other products of "Teacher Xing" have won bids in the education bureau's tenders many times. Zhejiang Jianyi Education Technology Co., Ltd. continues to uphold the business philosophy of "excellent quality, diligent service, and sincere conduct", and adheres to the development policy of promoting the "Teacher Xing" culture, forging the "Teacher Xing" brand, and creating the "Teacher Xing" cause. Provide excellent equipment and high-quality services for the school's teaching and research. We are willing to cooperate sincerely with new and old friends at home and abroad, join hands and move forward together, and spare no effort to serve education and contribute to the cause of education.

 

Before assembly, please check whether the circuit is unobstructed, whether the components on the circuit are complete, and whether all contact points are in good contact. During the assembly process, be careful not to get the glue on your clothes or skin. Accessories should be kept out of reach of younger siblings to prevent accidental swallowing of parts! Don't play with it on your head, or the model might fall and hurt you!