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"However, this weak wind technique has another advantage, that is, it consumes very little money. After all, it is a spell that even wind magic apprentices can cast.

Therefore, under the airbag of the goblin airship, there is a magic circle of violent wind inlaid, driven by magic crystal, and the violent wind will be used against the air bag every short period of time. "

Feng Yu said: "So the gas in the air bag is the wind element, or it is the wind technique that changes the wind element."

Clarence nodded and said: "Yes, what's inside is the violent wind technique released by the violent wind magic circle, which is a manifestation of the wind element."

"But" Feng Yu still doesn't understand

Clarence said: "It's really difficult for me to explain this problem to you before I have any knowledge about buoyancy and atmospheric pressure.

Spells formed from magic elements should be said to be weightless. They move due to the pull of the magician's mental power.

Otherwise, you would think that with a forbidden spell of the level of Meteor and Firefall, the magician's mental power can really affect a meteor."

Feng Yu said in surprise: "There is no weight."

"Yes, otherwise the plant-type wooden spear technique would be fine, but if it were the earth-type magic rock spear of the same level, it would be unable to hold its weight due to mental strength as soon as it was condensed."

Feng Yu imagined that Nidia condensed the rock spear and then dropped it to the ground with a chirping sound. It was really embarrassing.

Clarence said: “According to what you said, the magic element is also a kind of energy, so it is easy to understand that it has no weight.

It is precisely because of this that the magic fired by magicians with mental power can be much farther than the spear thrown by warriors. Senior wizards can shoot magic more than one mile away, and the range of magicians can reach two miles.

You must know that mental power has a very small effect on matter in reality. Even we magisters can hardly move larger objects with pure mental power.

It is said that the spiritual power of the Saint level has undergone transformation and can directly act on large physical objects, but you know how difficult it is to produce a Saint level mage. "

The magic elements released by the magician through mental power have no weight, because they are not matter, but a manifestation of energy. Feng Yu figured out this theory after thinking about it for a while.

But that didn't mean he didn't admire the idea of ​​the goblin airbag.

There is a conjecture on earth that if a very light and high-strength compression-resistant material is found and used to make the airbag of an airship, then there will be no need to rush light gas into the interior, because no matter how light the gas is , also has weight.

As long as the airbag made of this material can withstand atmospheric pressure, then you can do the opposite, pump out the air in the motorboat, and turn the airbag of the motorboat into a vacuum bag. This is the idea of ​​a vacuum airship.

Don't look down on this fantastic idea, because once this idea is realized, theoretically speaking, humans can use a large enough vacuum motorboat to send objects beyond the upper atmosphere.

In other words, aerospace aircraft carriers may become a reality.

Vacuum airships can also be used to build a multi-level lifting platform in the outer atmosphere, so that the space elevator can greatly reduce the tension that the traction rope needs to bear through multi-layer borrowing.

There are also things like stratospheric solar panels.

Any equipment that needs to float for a long time can be realized by vacuum airship.

Compared with aviation kerosene and high-energy aerospace fuel, the cost of vacuuming is so cheap that it makes humans want to cry.

Therefore, if humanity's space dream wants to achieve leapfrog development, a vacuum airship with a very low take-off cost is a good choice. However, humans do not have the material that is supposed to be light and able to withstand atmospheric pressure.

But what did Feng Yu see here today?

The goblins filled the airship's airbag with weightless magic gas, relied on the magic gas to prop up the airbag to resist atmospheric pressure, and used ordinary materials to complete mankind's idea of ​​a vacuum airship.

This is no longer a powerful sentence that can explain the shock in Feng Yu's heart. At this moment, he really wanted to shout a magic and civilized magic, using a broken voice.

Immediately afterwards, Feng Yu felt very melancholy. Humanity's low-cost space dream was actually used by a group of green dwarfs as a means of transportation. There were so many words about Mai Maipi that he didn't know whether to say or not.

Feng Yu asked: "Why are goblin airships not used in war?"

This is a topic that he is more concerned about. After all, this thing may be a threat to the Cattail City camp.

Clarence said: "Because it is not suitable. What to use it for? The transport capacity of soldiers is too small, and a dozen soldiers will not be of much use."

Feng Yu said: "High-altitude reconnaissance, the enemy's movements can be seen clearly at a glance, how awesome it is."

Clarence said with a smile: "Reconnaissance is only considered reconnaissance if you can bring the information back alive. The goblin airship is so slow. A mentor-level magician can easily knock it down.

Small wars don’t require such expensive things, so how can a large war not be accompanied by magicians?”

Feng Yu nodded, so that's it.

But then he thought about it and said: "It can be used to transport magicians. Magicians are strategic forces. Can't transporting magicians play a decisive role?"

“It’s still the same problem, the goblin airship is big and slow, not maneuverable and easy to be discovered.

Besides, magister-level magicians can be called strategic powers because they can use large-scale magic. However, magister-level magicians can fly by relying on spells or scrolls such as levitation.

With the war going on, who cares about the consumption of magic scrolls or magic crystals? Just let the magician fly forward quickly and covertly.

Even more luxuriously, you can use the teleportation circle.

As for the low-level magicians who can't fly, they are not enough strategic power, and they are of little use if transported by goblin airships. The larger the scale of the war, the less likely they will be.

As for simply using it as a means of transportation, those rich human aristocrats can indeed do it, but they seem to prefer to drive mounts because it is safer. After all, you will know if the goblin airship has an accident in the air.

The lives of nobles are very precious, and they will not take such risks.

Therefore, except for goblins, few people use goblin airships. Even goblins use the most frugal airship design to reduce the cost of use.

You'll know when they land after a while. Riding on a goblin airship is not a good experience. "

Feng Yu was stunned for a moment, and hurriedly found someone to arrange for the goblin airship to land. After all, it was impossible for them to land in the camp area, not counting confidentiality. Feng Yu was afraid that this thing would cause an air crash.