Liu Jinghong was going crazy and asked urgently: "Why? Why is it unrealistic?"
Li Zhen pointed to the motor and said, "The power is too small."
"This speed is already extremely high, how could it have low power?"
Li Zhen said with a smile: "Synchronous motors have a common problem. They have high rotational speed and small torque. When I say small power, I mean that its torque is too small. It can't be realized with this small propeller. Go ahead and change it to a 40-meter-long one." Centimeter propeller coming.”
Someone immediately went to look for it.
Propellers are now standard equipment in aviation institutes. Once the industry emerged, propeller processing became too easy. And the aviation academy was full of propellers, and everyone was working on them, and they were available in all sizes.
Soon, someone installed a forty-centimeter-long propeller on the motor.
Liu Jinghong and others were silent, as they seemed to have seen the result.
"Pick up the phone." Li Zhen nodded.
'Zizzizi'
When the power was connected, a sharp sound suddenly came from inside the motor. The propeller shook twice but did not turn.
After a while, I saw green smoke coming out of the motor. There is a constant 'sizzling' sound inside. But the propeller only vibrated and did not turn at all.
Li Zhen asked someone to turn off the power and said: "Torque is the most important thing in an engine besides speed. Obviously, this motor cannot even drive a 40 cm long propeller, which already illustrates the problem. Synchronous motor It cannot be used in airship engines."
Liu Jinghong said unwillingly: "Master Li. But... maybe it's because this synchronous motor is relatively small. The power will increase with its internal structure. In two days we will make a motor that is larger than the current one." If the motor is ten times or twenty times larger, then its torque will definitely increase geometrically, and its speed will also increase ten or twenty times."
Li Zhen laughed: "Let's not talk about whether the synchronous motor will become more powerful as the size increases. Please discuss this with the people at the Electromagnetic Institute. According to your idea, the reminder will be ten times larger, and the torque and power will also be ten times larger. Times, then did I say that energy is conserved? In contrast, will the power consumption also increase ten times?"
"Uh... this..."
Liu Jinghong was speechless.
Li Zhen gave Liu Jinghong a stern look and said seriously: "In science, the most terrifying thing is for laymen to instruct professionals. People at the Institute of Aeronautics and Astronautics only learn aeronautical knowledge, while people at the Institute of Mechanical Engineering learn... Regarding the power of mechanical structures, you went to study the professional field of other people's electromagnetic institute. To describe it in one sentence, your behavior is simply using your own hobbies to challenge other people's jobs!"
As soon as these words came out, everyone in the Aviation Academy and Mechanical Academy lowered their heads.
Everyone at the Electromagnetic Research Institute held their heads high and their chests high. Comfortable, comfortable, quick, Master Li, scold them a few more words.
As a result, Li Zhen changed his voice and looked at the Electromagnetic Institute: "Are you very proud? You didn't understand the things in your professional field thoroughly, but instead let a group of laymen mature the technology. Are you very proud?"
As soon as he said this, everyone in the Electromagnetic Institute lowered their heads in shame. I wanted to explain that 'we are currently focusing on AC motors', but I didn't dare.
Li Zhen stood up, pointed at the still smoking motor and said, "If you enlarge it ten times, assuming the power is ten times greater, the power consumption will also increase ten times. The battery required will also increase ten times." Times. The big battery you are using now weighs at least dozens of kilograms, right? After spinning it for a while, try to see how much power is left in it? If you want to use a synchronous motor as a motor, if you can really get the power The motor is big enough to propel the airship. Then you need to bring at least a few hundred kilograms of batteries aboard.
A battery of several hundred kilograms may only be able to keep it spinning for an hour. Does it make sense? Even if you don't consider the battery life issue, let me ask you, how much thrust do you think this synchronous motor can produce even if its torque is increased ten times? A very simple question, even if its power is expanded twenty times, it will not be able to propel an airship weighing several hundred kilograms forward. "
Liu Jinghong said: "Master Li, I've thought too much about this."
Li Zhen sighed: "I know you are eager to make progress. But haste makes waste, and progress is not something you just mess around with. I'm not criticizing you. I encourage trial and error, but you must at least find the right one. You have lost the direction. Why should I scold you because you are too impatient. If you calm down and think about it, and make a theoretical basis for yourself, you will find out that this is unrealistic. As a result, you don’t even make theoretical assumptions and just take the motor. It’s so whimsical.”
Everyone was speechless. This is indeed the case. This is an obvious disadvantage and is just a whimsical idea. No one even did any data preparation...
Li Zhen smiled and said, "I'm not saying that. The power of this synchronous motor is not even comparable to that driven by human power... "
"Um?"
Liu Jinghong asked in surprise: "Are you paddling in the sky?"
Li Zhen's face turned dark on the spot: "Are you stunned? Are you stupid by building a spaceship in Balong City?"
"Ha ha ha ha."
Everyone burst into laughter, Liu Jinghong blushed and lowered his head. I patted my head secretly, damn, Emperor Xun really affected his IQ. I have been in contact with that grandson for a long time, and my IQ cannot keep up.
How could I say such stupid things in this Kyushu Academy of Sciences? Paddling in the sky... I can't help but say it.
Ma Jianbin's eyes lit up and he said hurriedly: "Master Li, I have an idea."
"Tell me something."
"What you just said about human power reminds me, can we use a chain to connect the propeller. Then people pedal on it to drive the chain, and the chain drives the propeller? Hey, this is really a great idea, a human-powered airship. I I think I can give it a try. It’s driven by human power. The torque should be larger than that of an electric motor, right?”
Li Zhen covered his forehead helplessly: "I just gave an example."
After thinking for a while, he added: "Then if you are willing, go ahead and try it."
Everyone dispersed, and Li Zhen suddenly froze on the spot.
No, why did a word suddenly pop up in my mind, called - internal combustion engine
What is an internal combustion engine
Li Zhen was completely confused as to why he felt as if someone had told him that there was an internal combustion engine above the steam engine. But I can't remember it. Is the internal combustion engine a toy
What is the principle of internal combustion engine
Li Zhen's brows gradually furrowed. He was very sure that someone had really told him about the internal combustion engine, but it was so vague that he could not remember the principle of the internal combustion engine at all. Maybe, that person just mentioned it casually, maybe that person doesn't know much about the principle.
But the question is, who exactly told me this
Suddenly, his heart became hot again. Li Zhen covered his chest and murmured: "Is it her?"
"who is it?"
“…”
He was running out of knowledge and needed a boost.
PS: Big extra updates for those who vote monthly, and extra updates for those who give rewards. Continuing with five updates today.
(End of chapter)