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Chapter Nine Hundred and Ninety Seven Repeated Disappointment and Hope

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    Hearing what Major Cromlin said, Qin Baoshan shook his head: "I haven't learned it, I don't understand."

    "So, have you studied material science and processing technology theory?" Major Kromlin continued to ask.

    Qin Baoshan then shook his head: "I haven't learned it, I don't understand."

    "You don't understand anything, then" Major Cromlin originally wanted to say, you don't understand anything, so why are you here, you don't know how to repair at all, but just now, when you saw the  Although the Bayi-style rifle is relatively rough, Major Kromlin is quite satisfied with the work style of the workers of the Eighth Route Army who adapt measures to local conditions.  The respect of the military workers, so there is no sarcasm, but the meaning in the words is still revealed.

    That Chief of Staff Ye said with certainty that he quickly called Qin Baoshan to help repair it. However, this Qin Baoshan came, and he didn't know anything, and he didn't know anything, so what's the use!  Major Cromlin looked at Chief of Staff Ye, who was still working in full swing, with resentment unconsciously in his eyes.

    If Chief of Staff Ye didn't say anything, then he wouldn't pin his hopes on the Eighth Route Army at all. He would just contact Chongqing honestly and try to find a way to send over new propellers. However, Chongqing doesn't necessarily have spare parts.  , Maybe it has to be transported from the United States, and I don¡¯t know how long it will take.

    Without hope, there is no disappointment. The greater the hope, the greater the disappointment.

    "I'm sorry, your plane uses a variable pitch propeller. We really can't imitate this propeller. The original propeller has been bent. Even if it can be reshaped, I'm afraid that mechanical fatigue has formed inside.  If it breaks during the flight, it will cause an accident, we dare not try this." Qin Baoshan's next words made Major Kromlin stunned.

    What?  He actually knows that his own plane uses a variable-pitch propeller?

    "Do you know variable-pitch propellers?" Major Cromlin asked in disbelief: "Didn't you never learn the principle of propellers?"

    "Yes, I haven't learned it, but I know." Qin Baoshan said: "Your metal propellers use an advanced variable-pitch structure. When taking off, the pitch-variable device reduces the blade angle of the propeller, so that  Let the engine work at the maximum speed and maximum power, so that the propeller can generate the maximum pulling force. As the height increases, the blade angle of the propeller will gradually increase, which can match the air density at this height, so that  Let the propeller obtain the maximum useful power of the engine. This is a genius invention. So far, the devil¡¯s aircraft has not been put into practical use. Speaking of technological development, the United States is the leader in the world.¡±

    As soon as this sentence came out, Major Cromlin became even more happy and proud. This is the most professional thing.  The so-called blade angle is the angle at which the blades of the propeller are twisted. In the past, this angle was fixed, that is, the fixed-pitch propeller. It cannot fully exert the performance of the engine, but can only optimize a certain state.

    The idea of ??variable-pitch propellers has been around since World War I, but the wooden propellers at that time could not achieve this change at all. It was not until 1923 that the appearance of metal propellers gave this hope, and then after ten years of development  Development, in 1933, the United States first produced a variable-pitch propeller, which was used on the Boeing 247 transport aircraft. The famous C-47 transport aircraft naturally also contributed to the variable-pitch propeller.

    It changes the pitch of the propeller as the flight altitude of the aircraft changes, so that the full effective power can be obtained from the engine according to the height characteristic curve of the engine, and the effective power of the engine can be fully utilized under any conditions.  An aircraft designer's dream.

    It's just that it requires a certain industrial base, and the current Eighth Route Army is definitely not able to handle it. Not to mention China, even the Soviet Union has just started to develop variable-pitch propellers.

    But now, Qin Baoshan has explained this knowledge clearly and plainly, how can Major Cromlin not be surprised, his jaw is about to drop: "You still don't understand?"

    "I'm just talking on paper." Qin Baoshan said.

    In later generations, even if you are playing a drone, you will use a variable-pitch propeller. Qin Baoshan naturally knows the principle of this, but knowing the principle does not mean that you can make it. You know the principle of the aircraft.  , can f22 be made?  There is no industrial base.

    Qin Baoshan really can't make it, which is beyond his ability. If he has a CNC machine tool at this time, it will be more or less the same.

    Major Cromlin feltNo, what is going on, hope, disappointment, hope again, disappointment again!  Who could stand this several times, he felt that he was about to go insane.

    At this time, Qin Baoshan gave him another hope.

    "It's impossible for us to imitate it as it is." Qin Baoshan said, "However, if we make it fly, I have a plan."

    "Say it quickly." Major Cromlin said, he felt his heart beating fast, this time, he couldn't let him down again!

    "We can make a wooden propeller, a fixed-pitch propeller, which only meets the optimal performance at a certain altitude, such as two thousand meters? In this way, there is no problem at all to fly back to Chongqing." Qin Qin  Baoshan said: "When you arrive in Chongqing, you will have more options."

    Let¡¯s get started with the local method. The variable pitch propeller cannot be made, and the original one can¡¯t be used anymore. If it is bent, it can be straightened, but what about after that?  That thing can't achieve dynamic balance, it will tremble when it flies, there is no cure at all, but it can still be done by imitating one with wood, if you can't change the blade angle, it won't get better  up.

    "A wooden fixed-pitch propeller?" Major Cromlin said, "Can you guarantee the quality?"

    ? If it¡¯s okay, it¡¯s OK. The key is quality. If it¡¯s not up to standard, the propeller will have to withstand a power output of 1,000 horsepower. As long as it¡¯s unbalanced, it will tremble and fall apart.

    Moreover, there is also the shape of the propeller, how do you make it yourself?

    "If you let us dismantle that one and imitate it, I can guarantee it." Qin Baoshan pointed to the intact propeller on the right.  (Remember the site URL: www.hlnovel.com
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