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Roadkill ¡¤ 10

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    But in this case, I really couldn¡¯t think of any experiments to do, so I asked: ¡°Brother Ming, what investigative experiments do you want to do?¡±

    "Car combustion experiment!" Brother Ming lit a cigarette.

    "What, a car combustion experiment? So exciting!" Ye Qian looked excited.

    Brother Ming nodded and continued: "As Xiaolong analyzed, the place where the suspect returned to retrieve the tools may be near the corpse burning site. Now I want to define a range for this 'nearby', otherwise there will be no results from the endless investigation.  But in order to accurately draw this range, we must first clarify one of the most important issues.¡±

    "what is the problem?"

    "How long did it take the suspect to burn the car?"

    Ming Ge glanced around and explained: "According to the transcript of the day shift driver Wang Hui, the deceased had a full fuel tank when he picked up the car every day. He was driving an old Santana sedan, which was ten years old and the fuel tank capacity was 60  Li. Jiao Lei, can you estimate how many kilometers the car traveled on the day of the incident?"

    "He was always running in the city. According to the surveillance video, there is no problem at all."

    "Okay, now that this problem is solved, the experimental results will be more accurate." Mingge took a long puff of cigarette and continued, "We know the total capacity of the fuel tank, minus the fuel consumption during driving, then what is left in the fuel tank  We can get a value based on the capacity.¡±

    "Through surveillance, we can analyze that the suspect is a guest that Shen Guangming randomly pulled into his car on the roadside. The suspect was not prepared before committing the crime. Guoxian has analyzed that the accelerant for burning corpses is gasoline, so I have  The reason is that the gasoline used by the suspect was drawn from the car's fuel tank."

    "Based on the distribution of the accelerant at the scene, it is at least 30 liters, which adds up to 30 thermos bottles. There is basically no possibility that the suspect will carry it with him. He can only draw it from the fuel tank." Lao Xian interjected.  One sentence.

    "If we can know the total time the car burned, minus the half hour he spent smoking and squatting, then we can get the approximate time it took the suspect to go to and from the cremation site."

    ¡°Then we calculate the suspect¡¯s step length and walking frequency based on his height, so that we can roughly determine how far the suspect walked during this period of time. Is it Brother Ming?¡±

    "Xiaolong is right. Knowing this distance means we can draw a relatively accurate scope of investigation. Searching for stores with professional grinding tools within this scope will be more targeted!" After hearing this, I was already enlightened.  My brother was completely convinced, and I finally knew the real purpose of his interview with the day shift driver Wang Hui. In fact, he already had a rough estimate in his mind as to how far the evidence at the scene could be analyzed.

    ???????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????:????????????????????????????? Mingge and I went to all the second-hand car trading markets in Yunxi City to look for experimental vehicles. Our hard work paid off, and we actually found a Poussin sedan in similar condition to the vehicle involved in the crime.  Because the investment cost of this investigation experiment was relatively high, in order to ensure a one-time success, Ming Ge decided to drive the car to the site of the corpse burning site to conduct the experiment.  In addition, we also chose climatic conditions such as temperature, humidity, wind direction, etc. that are similar to those on the day of the crime, so that the experimental results obtained can be used to solve the case.

    At one o'clock at night, we all gathered around the small road at the crime scene. Lao Xian had already poured gasoline into the compartment of the Poussin sedan in accordance with the experimental requirements.

    "Xiaolong, there is still so much oil in the fuel tank, will the car explode if it is ignited?" Ye Qian was a little worried.

    This sentence reached Lao Xian's ears. He shook his head and explained: "In movies, cars burn and explode. In fact, this is all necessary for action movie scenes. In real cars, fuel tanks will almost never explode when burning."

    "Really?" I didn't believe it.

    Lao Xian said seriously: "Automobile fuel tanks can be divided into two categories. The first category: metal automobile fuel tanks. There are mainly iron fuel tanks and aluminum alloy fuel tanks. Because iron fuel tanks have poor corrosion resistance, aluminum alloy fuel tanks are currently more commonly used.  Widely used. Metal fuel tanks are mainly used in large passenger cars and heavy trucks, which consume a lot of fuel."

    "The second category: polymer plastic fuel tanks. With the development of polymer plastic fuel tanks today, they not only have all the stiffness and strength of metal fuel tanks, but also have many advantages that metal fuel tanks do not have. For example, plastic fuel tanks will not be damaged when a car collides.  Because the fuel tank catches fire due to friction with other objects, plastic fuel tanks do not generate static electricity, and the fuel tank can last for 30 minutes under intense fire, etc. So now most private cars use plastic fuel tanks.¡±

    ¡°Now that we have figured out the material of the fuel tank, let¡¯s talk about whether the fuel tank will burn during combustion.Will explode.  "

    "Anyone who has studied chemistry knows that an explosion requires a confined space. The polymer plastic fuel tank itself is flammable and will melt when exposed to an open flame, thus breaking its sealed environment. Metal fuel tanks are easy to use because of the presence of gas at the filling port and other locations.  Molten parts, when exposed to high temperatures, the gasoline in the fuel tank will leak out, which is equivalent to breaking the confined space. Therefore, in film and television dramas, the oil leakage and explosion in the car are to increase the visual effect. In fact, this has been ruled out from the design of the car fuel tank itself.  Possibility of explosion.¡±

    "Thank you, Teacher Guoxian, then I'll feel relieved." Ye Qian patted her chest.

    "Are you ready?" Brother Ming asked, holding up the stopwatch.

    "That's it!" Lao Xian had already held the igniter in his right hand.

    When we all stood at a safe distance, Brother Ming and Lao Xian looked at each other: "Light the fire!"

    Beep, the stopwatch is also pressed at the same time.

    The car was quickly engulfed in flames, and the entire road was brightly illuminated by the flames. The thick fog quickly merged into the dark night sky like beacon smoke. The shadows of the five of us swayed back and forth with the moving flames, and the heat waves came one after another.  Coming towards us, time jumped quickly on the stopwatch.  Because the fire was deliberately set and the amount of combustion-supporting gasoline was large, the burning speed was quite fast. It only took less than two hours from ignition to the time when the flame was about to extinguish.

    Brother Ming calculated the scope of the investigation by combining the experimental results and the step length I estimated.  The electronic map shows that the suspect has not left the economic development zone. The focus of the next investigation will be employees in the automobile-related industries in the development zone. We have already obtained the suspect's DNA sample. With these conditions, it is actually equivalent to catching a turtle in a jar.

    The criminal police team has quietly laid out a dragnet to wrap up the entire Economic and Technological Development Zone.

    ¡°You wouldn¡¯t know if you didn¡¯t investigate, but once you investigate, you¡¯ll be really shocked.  Although the Economic and Technological Development Zone is sparsely populated, it is a gathering place for car 4S shops. The shops in the development zone are basically engaged in car-related industries, such as car repair, car beauty, car washing, etc.

    Based on the information provided by the migrant population controller at the police station in the jurisdiction, we have found a total of more than 50 people who match the physical characteristics of the suspect. These people need to be investigated one by one and screened secretly. This is undoubtedly a long task.  (Remember the website address: www.hlnovel.com
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