A shield cart is pulled by eighty horses, which is not a small force, and it also reflects the great advantage of the industrial age over the agricultural age.

It's just that the "Broken Leg Maniac" Swordfish has 750 horsepower, the "Air Tractor" Yun-5 has 1000 horsepower, and the "Hellcat" F6F has 2000 horsepower.

Modern families have more than 100 horsepower cars, and the tanks at this time are a bit shabby in comparison.

In fact, now that the internal combustion engine is just emerging, many technologies are still immature, and it is normal for the power not to go up.

The Marco 1 tank, which appeared at the end of World War I, had an engine power of just over 100 horsepower.

The first aircraft equipped by the U.S. Army had a power of only 30 horsepower.

After thinking about it for a while, Zhu Jingyuan said:

"The aircraft used for testing, whether it is size or engine, should be in the middle grade."

According to Zhu Jingyuan's requirements, Li Rui chose a test machine with a wingspan length of 12 meters, a total weight of 420 kilograms, and an engine power of 32 horsepower.

When arranging for the craftsman to pull the plane out, the upright Li Rui couldn't help but remind Zhu Jingyuan:

"Your Highness, the weight of this aircraft is already on the high side, and we need to modify the wings and install rudders, so I suggest that the lighter and smaller engines can be replaced."

However, Zhu Jingyuan didn't care:

"It's okay, I don't think it's a big problem, let's use it first and try it first, if it doesn't work, let's change ......"

Zhu Jingyuan barely remembered the approximate parameters of the Wright brothers' first aircraft.

It weighs 360 kilograms, the engine power is 12 horsepower, and the wingspan is also just over 12 meters.

Although the test machine in front of Zhu Jingyuan is heavier, the engine power has nearly tripled, and the thrust-to-weight ratio is at least twice as high.

The first military aircraft officially equipped by the US Army was at this level.

Moreover, the Wright brothers are amateur inventors who repair bicycles, and their helpers are the top designers and craftsmen in the world empire.

It also directly provides a truly full-fledged airfoil, and the lift is certainly much higher than that of the Wright brothers.

So as long as nothing happens, it will most likely be able to fly.

Hearing that Zhu Jingyuan was so determined, Li Rui could only shake his head helplessly, and led the craftsmen to start modifying.

The structure of the original test aircraft was very simple, and the modification was just as simple, and the materials and tools at the test site were readily available.

Although the original wing is curved, there is also a support structure under the curved structure, and now it is enough to paste the skin.

Four steel pipes were tied longitudinally to the middle frame of the wings, and fastened with locks and wires, which was regarded as a simple airplane fuselage.

Two sets of movable wing plates are made separately with steel pipes, columns, skins, and springs, which are used as rudder surfaces for left and right and up and down swings respectively, and steel wire pulling is used to control the swing.

The rudder surfaces of the two sets of movable wings are fixed on the front and tail of the steel tube fuselage respectively.

Pull the wire to the middle of the two layers of wings, fix it on both sides of the pilot's seat, and use levers, pulleys, handles, and automatic buckles to make two simple rudder adjusters.

All the modifications took less than two hours, and when they were all completed, it was almost 11:50.

There are still ten minutes to get off work and eat.

The enthusiasm of the craftsmen for fixed-wing aircraft is not high, some do not think they can fly, and some have experienced too many failures, and people have become numb.

Now it's almost time for lunch, and the craftsmen are subconsciously wanting to eat.

But now that the prince is watching here, the time has not really reached the end of work, so he can only continue to prepare for the test patiently.

Everyone instinctively thinks that it shouldn't take long to test once, and usually the failure is very fast.

On the contrary, if it succeeds, then the time is not counted, but it should not be so easy to succeed.

Two craftsmen dragged the modified plane to the end of the test site in the middle of the test site.

The craftsman in charge of the task of testing the aircraft looked at the sky, roughly estimated the direction of the wind and the angle of sunlight, then climbed to the middle of the wings of the aircraft and sat down and began to inspect the control equipment.

There were a few craftsmen around who looked a little bored, and looked back in the direction of the cafeteria from time to time.

After the flight tester completed the inspection, he shouted to Li Rui, who was in charge of the on-site command:

"Right-"

After Li Rui heard this, he looked at Zhu Jingyuan beside him and asked whether to start the test, Zhu Jingyuan nodded lightly, indicating that he could start.

Li Rui took a deep breath hard, held a horn with a thin iron roll, and began to shout loudly at the top of his voice:

"Attention everyone, fixed-wing flying machine testing is about to begin, and no one is allowed to approach the test runway-"

"Auxiliary group, get ready to start the engine!"

Li Rui shouted very seriously and formally, but the situation at the scene was actually very casual, and there was no sense of seriousness at all.

Everyone didn't care much about this test, Zhu Jingyuan thought that most of them would succeed, and others felt that most of them were just tossing.

The two craftsmen who were originally watching the canteen, after hearing Li Rui's shout, carried something similar to the lever of starting an old-fashioned tractor, walked to the back of the wing and began to shake.

A few seconds later, accompanied by a burst of black smoke, a piercing sound sounded, and the propellers of the plane also whined.

The craftsman in charge of starting the engine immediately ran away with the crank on his shoulder, and the plane began to slowly slide forward.

At this moment, a crisp bell rang, and everyone subconsciously turned around.

I saw that in the other houses around, a group of people came out one after another, and the meal at the test site finally arrived.

The two craftsmen carrying the crank subconsciously wanted to leave, but after glancing at Zhu Jingyuan's father and son, they forcibly resisted the urge to leave, and waited patiently for the results of the plane test.

The other craftsmen who came out of the surrounding area also found out about the test here, and most of them shook their heads and left, hurrying to the cafeteria to eat.

A mess around.

Many craftsmen who had just come out chatted with each other in twos and threes, did not hear Li Rui's previous words, did not pay attention to the planes on the runway, and walked to the runway unconsciously.

In fact, this runway is not a flight runway with many positive tracks, after all, the planes have not yet succeeded, and they are just a few lines drawn separately on the concrete floor in the middle of the compound of the test site.

There were no definite obstacles on either side of the runway, and the proximity to other test sites around it, coupled with the continuous failures, the surrounding craftsmen had long since taken it seriously.

Li Rui could only hold the loudspeaker and keep shouting:

"Don't go near the runway, don't go near the runway...... Don't ......"

And in this chaos, I don't know who suddenly screamed:

"Ahh

Everyone was stunned:

"What's that?"

"What's going on?"

Then there was a barrage of exclamations.

"Fly! Fly! ”

"it!"

"That thing is flying!"

"The big kite is in the sky!"

"How is this possible, this is really flying!"

"This thing can really fly!"

Zhu Jingyuan immediately turned his face and found that the two big wings had slowly left the ground.

Then, amid the cheers of the film, it continued to climb up at a slight incline.

As the plane got taller and taller, so did the cheers around it and the range grew.

Everyone stopped, looked up at the sky and shouted.

The movement outside was so great that the people in the cafeteria also ran out, and then the chef of the cafeteria also followed, and no one went to eat at all.

Everyone couldn't control it, and cheered loudly together, and the whole test site turned into a noisy ocean.

Humans really flew on their own!

And it's not a little floating, it's really flying in the sky.

Several minutes had passed since the time it left the ground, and the plane was still flying in the sky, and it was flying higher and higher.

Airships and hot air balloons are able to float by reducing their specific gravity so that their overall specific gravity is smaller than that of air.

The specific gravity of the airplane is larger than the air, and like a bird, it uses its wings to cut through the air current, and finally flies on its own.

The principles of the two, as well as the feelings they give people, are completely different.

Li Rui's eyes widened completely, and he couldn't speak as he looked at the flying machine in the air.

And it was – it really worked!

This His Royal Highness Jingyuan is really a genius......