Ask Sword

Li Ang dipped some dew from the weeds on his thumb, and raised his thumb to face the morning wind, feeling the wind speed, wind direction, temperature, humidity and other factors.

Everything fits.

He turned his head to look at Yu Feiyu, and said with a smile, "The special envoy can check this aircraft to make sure that no silk or talisman is used on it."

Yu Feiyu frowned slightly, took half a step forward, released his spiritual consciousness, and glanced at the "gong" shaped aircraft.

Indeed, as Li Ang said, the metal wires, masts, propellers, transmissions, etc. on the aircraft are all made of ordinary metal and light wood boards, which are not the best carrier of thoughts.

As for the skin of the aircraft

"Is this the skin of a civet rabbit?"

Yu Feiyu asked.

"It's paper made from civet rabbit skin."

Su Feng nodded and said: "Peel off a layer of rabbit skin and take out five pieces, tan them, dry them in the shade, soak them in water and crush them, and fuse them with the fibers of red bamboo to make a whole piece."

Bian Chenpei's eyes lit up, and he immediately said: "The raccoon rabbit is a fourth-class monster. The material made of its skin is naturally an alienated thing, and it is considered a contraband!"

"I'm afraid not."

Su Feng glanced at him, and said calmly: "The raccoon paper is very light in weight and extremely strong in toughness, it won't be broken when it is torn, and it won't rot when exposed to water.

It can be used as a high-quality leather lining, and can also be used as paper to record important information.

For the past three years, what we have tried again in our academy is the civet rabbit paper.

It is already a common item in Yu State, and a part of it will be provided to Mount Taihao every year—in the books and classics carried by the envoys, there may be paper made of civet rabbit fur. "

"."

Was put together.

Bian Chenpei's face turned ugly again.

Mount Taihao concentrated the resources of the whole world, and the food and clothing expenses of the students were more "extravagant" than ordinary royal children, and they didn't care about the daily necessities at hand at all.

If he said that the raccoon rabbit skin paper was a contraband, how would he explain it if the Academy found related items from them?

You can't sacrifice wine in front of the academy, and in front of foreign students,

It is hard to say that the contraband in the Academy is a contraband, but the contraband in Taihao Mountain is not, right?

"If there are no problems, then I will start."

Li Ang smiled slightly, opened the leather door of the cockpit, and sat on the seat.

To say it is a cabin is actually very reluctant.

There is not much redundancy in the narrow space, and the chainrings and chains are all exposed. You need to be extra careful when stepping on the pedals to prevent yourself from being scratched.

In the eyes of outsiders, this aircraft looks extremely weird and crude, but in Li Ang's eyes, every part of this aircraft is the crystallization of human wisdom.

In the memory of other worlds, it has a very beautiful name - Gossamer Albatross.

It was designed and manufactured by American aeronautical engineer Mike Credy, and the gears, chains, and propellers are driven by human muscle power to fly,

And on June 12, 1979, driven by Brian Allen, it took 2 hours and 49 minutes to fly 37 kilometers across the sea and fly across the entire English Channel.

Various information flashed through Li Ang's mind, he looked out through the cockpit skin,

Under Su Feng's command, the surrounding people dispersed and cleared a runway in the open forest.

All eyes were on this weird aircraft and Li Ang in the cockpit.

"Can this fly?"

"It looks so bulky, and it's completely different from the previous model airplanes."

"And it's made of wood, won't it really fall apart in half?"

The surrounding discussions are carried into the ears with the breeze,

Li Ang smiled slightly, looked away, put his hands on the handle, and stepped on the pedal slowly.

The high-precision transmission device manufactured by Tantai Leshan himself has no harsh metal friction sound. The pedal drives the crankset and drives the flywheel to rotate from slow to fast.

The chains flowed at high speed, driving the propeller blades at the rear of the aircraft to rotate slowly.

The propeller blades generate wind force, pushing the aircraft forward slowly and accelerating.

The pulley under the cockpit rotates across the lawn until it breaks away from the ground.

Amid unbelievable gazes, the aircraft left the ground,

The huge horizontal wings shrouded in the morning light, like the wings of a giant beast, cast shadows.

"It actually, really, flew up."

Students from all over the world subconsciously opened their mouths wide,

Yu Feiyu's eyes narrowed slightly, and his profound spiritual knowledge that did not match his age swept towards the sky, covering the aircraft.

There is no thought power, no talismans, not even the slightest fluctuation of aura.

This aircraft, as Li Ang said, was driven purely by manpower to complete the flight.

"How can it be"

Bian Chenpei's face was livid, and he muttered to himself,

Ordinary people find it difficult to lift heavy objects of their own weight.

But with such an aircraft, can it break away from the bondage of the earth?

"nothing is impossible, "

Ou Zhiyuan looked at the aircraft and said with emotion: "Do you remember the lift formula that you abandoned like a shoe?

Lift is equal to the lift coefficient, multiplied by one-half, multiplied by speed multiplied by itself, multiplied by air density, multiplied by wing area.

Because it is driven by manpower, the speed cannot be very fast. In order to increase the lift,

Just optimize the lift coefficient of the wing and increase the wing area.

The wings of this aircraft have been specially designed, the lift coefficient can reach 3/2, and the lift-to-drag ratio exceeds forty.

And because the material is extremely light, the total weight is only about 50 jin, which is only 150 jin including Risheng.

The load on the average area of ​​the wing is extremely low, even if it flies slowly at an extremely low speed of 30 miles per hour, it will not stall.

Ordinary manpower, substituted into the power, rotational speed, pulling force, and speed formula of the propeller, can fully satisfy the minimum speed that keeps the aircraft flying. "

Accompanied by Ou Zhiyuan's words, Li Ang drove the aircraft twice in the sky, drew a "8"-shaped trajectory, and landed slowly.

"Confucianism is a science that studies the principles of everything in the world."

He pushed open the cockpit door and said, "Air, water, vegetation, land. Everything has its law.

It is true that the speed of this aircraft is far less than that of a fast running, and its load capacity is far less than that of a carriage. As for its defensive performance and maneuverability, it is far behind by Feijian.

But its existence proves one thing - human wisdom is the most precious wealth.

In the past, the privilege of flying in the sky, which was considered to be reserved only for birds and a few monks, can now be possessed by any mortal.

This is the charm of philosophy. "

Li Ang smiled, glanced at Bian Chenpei and other Taihao Mountain disciples with ugly faces, and said: "To prove once again, I didn't use any methods of reading or talisman just now,

I wonder if there are any volunteers who are willing to try to fly this aircraft? "