Chapter 212: Light Aircraft (Ⅱ)

After listening to Teacher Benny's idea of ​​"dropping insecticide", everyone felt incredible!
Is this okay?
Joan recalled the debris that he saw on the carriage when he arrived, and asked Mr. Benny doubtfully: "You said the aircraft was assembled from those things on the carriage?"
"Yes, but what you see is only the parts to assemble the aircraft. The power to make it fly comes from a special gas. I will make it temporarily."
"Are you referring to hot air balloons?"
Joan saw this device using heated gas to provide flight power in a book.
"My invention is very similar to a hot air balloon, but it doesn't need to be heated continuously. You will know it later."
Teacher Benny said confidently.
"Joan, Mr. Vaasa, I have to advise you not to expect too much from Teacher Benny's invention, and don't say if that thing can fly, thank the gods for blessing before leaving the ground!"
Ah Chi couldn't help pouring a bucket of cold water for everyone.
"Just now you said that my alchemy bomb was useless, what was the result? When will your short-sighted white mouse learn to respect science!"
Teacher Benny retorted angrily.
A shrugged, not daring to talk coldly.
Major Vasa saw the confidence of Teacher Benny, and there was no safer way. Let him try it. Even if it ended in failure, the consequences would never be worse than arson. So he came to the housekeeper Tobias and asked him to take the pile of parts used for assembling the aircraft on the carriage of the newspaper. He also found a group of attentive maids to help Joan prepare the pesticides.
With the assistance of the Vassar's maid, Joan quickly prepared two large buckets of high-concentration "insecticides."
The maids scooped up the "insecticide" with a water scoop, poured it into an empty wine bottle, plugged the cork tightly, and prepared more than two hundred bottles of "insecticide" within an hour, enough to sprinkle the entire wood.
Compared with pesticides, the most important is the air vehicle used for the delivery of pesticides. Joan was full of curiosity about Mr. Benny's invention and ran to observe him assembling the aircraft after the pesticide was prepared.
The structure of the aircraft is very simple, similar to the "hot air balloon" illustration in the book. The main structure is a bladder for inflation and a large gondola for carrying people.
Teacher Benny's balloon also has its unique features. For example, a mast is erected in the center of the gondola, which is formed by nesting and combining steel pipes with threads at both ends. The lower end of the mast is firmly fixed in the gondola, the upper end is connected to the balloon, and a large piece of canvas is tied to the middle of the mast. After opening, it is a rectangular sail.
Seeing the assembled aircraft, Joan could guess how it worked.
The question now is how to inflate the airbag so that the gondola floats.
It is certainly not possible to inject air directly into the airbag, which will not produce enough buoyancy at all.
The traditional method is to inject air into the airbag, and then ignite the heated air under the airbag. Since the air in the airbag will become lighter after heating, the buoyancy generated will drive the gondola to the sky-this is called a "hot air balloon".
In order to make the hot air balloon continue to fly, it is necessary to continuously heat it and keep the air in the skin sac high.
Conversely, if you want the hot air balloon to land, you must weaken or extinguish the source of the fire. The gas in the sac gradually cools down, and the balloon slowly falls.
The biggest drawback of this flying device is that it must use open flames to heat the air, and ignition in the gondola is undoubtedly very dangerous.
Especially when the balloon rises to a certain height, if the gondola catches fire or the skin is ignited, it will inevitably lead to a painful accident.
The new balloon invented by teacher Benny is using a brand new gas instead of hot air to provide buoyancy for the gondola.
The density of this gas is much lighter than that of air, and Alchemists of Vares call it "light gas".
Joan had seen the introduction of light gas in alchemy books, knowing that this gas is not only very light but also easy to explode, so it is not difficult to understand why both A Chi and Xiao Miao are afraid of the flying machine invented by teacher Benny. .
However, driven by curiosity and curiosity, he would rather take some risks and observe closely how teacher Benny prepared light breath.
The raw materials used by teacher Benny to prepare light gas are very common, mainly clean water and iron powder.
The container for making light gas-called "reaction kettle" in alchemy-is the sealed iron drum with a faucet that Joan saw.
Teacher Benny unscrewed the large slap cover above the iron bucket, poured fresh water into the bucket, and then sprinkled iron powder.
The weight of water and iron powder are weighed repeatedly to ensure that the ratio is not bad.
According to the alchemy formula, iron powder and water vapor can react at high temperatures to produce light gas and magnets.
Joan knows this formula, but he also knows that water will not turn into steam automatically, and will not easily react with iron to make alchemy.
In order to promote the rapid reaction of water and iron, Mr. Benny finally took out a small paper bag, poured brown powder from it, carefully weighed out half an ounce with a balance, and then poured it into the reaction kettle, tightening the lid as fast as possible .
Joanne couldn't see the specific composition of the brownish-yellow powder, but he knew that it was a "catalyst" and did not participate in the alchemy reaction itself, but could promote the accelerated reaction of water and iron to produce light gas.
Teacher Benny stared closely at the reaction kettle and raised his ears to listen to something. A crackling sound soon came from the barrel, sounding like frying beans, the temperature of the iron barrel rose sharply, and Joan felt hot from two steps away.
"Joan, Joan!"
Behind him came the shout of Xiao Miao. Looking back, Catwoman and Ratman were lying in the grass, and they beckoned him eagerly.
"What's wrong, Sister Meow?" Joan ran over and asked.
"Don't approach the crackling big barrel, maybe it will blow up with a bang!" Xiao Miao simulated the explosion with exaggerated gestures.
Joan thought about it for a while. Water and iron generate light gas in the sealed iron drum. The rapidly expanding gas will cause increasing pressure to the iron drum. When the pressure exceeds the limit of the iron drum, it may indeed explode.
Ah Chi saw that he was silent, thought he was unbelieving, put away a smile, and said seriously: "Teacher Benny had prepared a light breath in the basement of the newspaper office. Guess what?"
"Boom! Almost blew up the entire building. Since then, Sister Miranda has banned him from inventing in the office."
"It shouldn't explode this time." Qiao Anxin calculated the alchemy reaction formula and said to Xiao Miao and A Zhi: "According to the amount of iron powder that Teacher Benny put into the iron bucket, the light gas produced by the complete reaction is not enough. Blast the iron bucket."
"I hope you are right, but there is nothing wrong with being careful."
Xiao Miao took his hand and prevented him from returning to the reactor.
Joan stood in the distance, silently watching the alchemy reaction continue in the iron barrel.
After about 15 minutes, the crackling sound in the iron bucket gradually subsided.
Teacher Benny dragged a leather-sewed hose to the basket, and connected one end of the hose to the inflation port of the airbag, and the other end was put on the tap of the iron bucket, and was wrapped with iron wire to securely fix it. .
After preparing, Teacher Benny reached out his right hand wearing cotton gloves, intending to unscrew the hot faucet.
Joan hurriedly stopped: "Teacher Benny, let me come!"
An iron barrel filled with high-temperature and high-pressure gas is like a bomb. Since the gas is nowhere to be discharged, it is actually not as dangerous as it seems.
When the faucet is unscrewed, high-pressure gas can be discharged from the iron barrel through the narrow faucet. The bomb is ushering in the most dangerous moment, and the possibility of explosion is greater than before.
Instead of letting Mr. Benny take the risk of the faucet close to the iron bucket, Joan is undoubtedly safer to open the faucet remotely with the "hand of the higher master".
In case the iron barrel exploded, he would have time to lie down and avoid shrapnel.
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