Since the mass production of sulfur suan has been put into production, it has not been difficult to produce hydrogen. Pen, fun, pavilion www. biquge。 According to Wang Yu's guidance method, Song Shiyi, president of the Academy of Sciences, diluted liu acid to make dilute sulfur suan, and then used iron to react with dilute acid to obtain hydrogen. Collect the hydrogen you get and make a hydrogen balloon.

However, Wang Yu was not satisfied with the hydrogen balloon, the shape of the balloon has high air resistance and slow running speed, so at his suggestion, scientists from the Academy of Sciences built a spindle-shaped hydrogen airship.

But when it transitions from a balloon to an airship, and it's a hydrogen airship, the problem arises again: the higher the flight altitude of the airship, the lower the air pressure, and the lower the air pressure, the thinner the hydrogen in the airbag becomes, and the airbag will expand. The final result was that the airbag could not withstand the internal pressure and was burst, and the airship exploded in the air, resulting in the destruction of the boat.

In order to solve this problem, Song Shiyi's initial idea was to install a valve on the airbag, and once the airbag expanded, the hydrogen in the airbag would be released. But after the hydrogen is released, it can no longer be raised, and for the airship to land, the hydrogen in the airbag must be released before the airship can land.

After all, hydrogen is not easy to obtain in this era, it is a very expensive gas, and the airship is a kind of aircraft that performs reconnaissance missions on the front line, and there is no compressor and gas tank with excellent sealing in this era, hydrogen cannot be liquefied, and it is not easy to carry, so it is necessary to find a way to solve the problem of airship lifting.

So Wang Yu came up with a solution is a double airbag structure, which is similar to the principle of a submarine, there is an inner airbag inside the outer airbag, the outer airbag is filled with hydrogen, and the inner airbag is filled with ordinary air, and there are valves and hand-cranked blowers to control the air emission and injection in the inner airbag. When the airship is about to take off, open the valve and release part of the air in the inner airbag, so that the inner airbag will shrink, the pressure on the hydrogen will decrease, expand, and the airship will take off. After entering a certain altitude, the air pressure inside the inner airbag decreases, expands, and squeezes the hydrogen in the outer airbag so that the hydrogen no longer expands, so that it can maintain a certain altitude and fly.

When the airship is about to land, shake the hand-cranked blower to inject air into the inner airbag, so that the pressure of the inner airbag increases, squeezing the hydrogen in the outer airbag, the volume of hydrogen decreases, the specific gravity increases, and the airship will naturally fall.

The airbag of this hydrogen airship is made of expensive silk coated with eucommia gum, which is very expensive, equivalent to the price of a catamaran clipper, but the hydrogen inside will not leak and can be used many times. Four people sit in the cradle, driving the airship with foot-operated propellers, which can reach speeds of up to 16 kilometers per hour.

In the camp of the Ming army, a thick wooden stake was tied to a cable, and the hydrogen airship was hovering at a low altitude, and the gondola was no more than three feet above the ground. This airship has been tested, and the safety performance is still relatively reliable, but Wang Yu does not need to risk boarding the airship himself, after all, hydrogen is easy to catch fire.

Zhao Zheng, the commander of the Qiongzhou Army, took his three brothers and climbed onto the airship from a small high platform piled up with wooden boxes.

"Ready to take off!" The king's [auxiliary] ministers gave the order.

Zhao Zheng turned the take-off valve in the gondola, and a silk tube passed through the outer airbag from the inner airbag and extended into the valve. The silk tube is sealed with eucommia glue and will not leak.

Rubber trees from the Americas have begun to be planted in large quantities in Nanyang and Hainan to produce natural rubber. However, because the technology of vulcanized rubber is not yet mature, rubber cannot be used to make shoes and tires, nor can it be used to make breather pipes, gas closure rings for mortar shells, gun latch gas closure devices for rear guns and air closure devices for rear loading guns. The pipes inside the airship cannot be made of heavy iron or copper. In order to solve this problem, the internal pipes are also made of silk, which is covered with iron wire and sealed with eucommia glue.

Zhao Zheng opened the valve, and the hydrogen gas, which was lighter than air, expanded, squeezing the inner airbag, so that the air in the inner airbag was discharged through the valve.

The valve of the hydrogen airship makes a "whoosh" sound, the air in the inner airbag is gradually discharged, the hydrogen expands, and the hydrogen airship staggers and slowly rises into the air.

Wang Yu raised his head and took a look, the airship rose into the air about a hundred zhang, it was very safe to fly at this altitude, the bows and arrows and muskets of the Qing army could not hit so high, if the cannon was raised, it might be able to hit. However, the artillery of that era was inconvenient to operate and had poor accuracy, and it was simply impossible to hit a hydrogen airship at a height of 100 feet.

The world's first anti-aircraft guns in real history were born in the seventies of the nineteenth century, during the Franco-Prussian War, the French army changed a small-caliber cannon into an anti-air gun, specially designed to shoot down Prussian reconnaissance balloons.

It is impossible for the Qing army to think of building an anti-aircraft gun, and the hydrogen airship can be said to be very safe to enter the head of the Qing army for reconnaissance, as easy as entering and exiting their own homes.

Zhao Zheng closed the upper valve, so that a certain amount of air was retained in the inner airbag, so as not to fly too high and cause the outer airbag to be inflated by hydrogen. Then the four Ming soldiers did not stop stepping on the pedals at night, and the gears and connecting rods drove the propellers behind them, and the airship flew towards the Qing army's position at a speed of 64 miles per hour, that is, a speed of 16 kilometers per hour.

"Oh my God! What's that? Seeing a spindle-shaped monster flying towards his head, the Qing soldiers on the position of the Qing army in Fengyang were terrified.

Cai Yumao raised his head, glanced at it and said, "What's this, it's Minggou's big Kong Ming Lantern again!" ”

"My lord, that's not right!" One Goshha said, "The large Kong Ming lanterns I saw before were all spherical, but this thing is not spherical. ”

"What's so hard about that!" Cai Yumao sneered and said, "It's not easy to make a shape?" If it weren't for the fact that our court didn't know what material to use to make the lampshade, we would have been able to build a large Kong Ming lantern that could carry people! ”

However, Cai Yumao was stunned when he said that, because this so-called large Kong Ming lantern has no flame! He picked up the telescope and looked at the large Kong Ming lantern in the sky, only to see that the large Kong Ming lantern was not only not ignited, but also the bottom was sealed, unlike the large Kong Ming lantern he had seen before, which was filled with heat.

"What the hell is it?" Cai Yumao was also a little confused.

Many Qing soldiers have already knelt on the ground, and even most of the Mongolian soldiers in the Manchurian Eight Banners have knelt down, kowtowing to the airships flying in the sky, and some people shouting Immortal Heaven bless.

"All up! That's Minggou's big Kong Ming lantern! Cai Yumao shouted.

A Mongolian said, "My lord, this is not a Kong Ming lantern! There is no fire, no light, but it can fly! ”