With the rapid rotation of the propeller, the drone slowly rises from the grass and flies until it is about ten meters in the air, where it stops.

Li Yu held the remote control in his hand, gently pushed the joystick, and tested whether the lifting and horizontal displacement functions of the aircraft were normal.

The signal transmission function between the drone and the remote control does not rely on the Internet, but is realized through its own antenna, and the effective transmission distance will be greatly shortened due to a large number of electromagnetic interference and environmental occlusion in the city.

Taking the DJI Mini 3 Pro in Li Yu's hand as an example, the flight range officially given by the strong interference under the FCC standard is about 1.5 to 3 kilometers.

In the suburbs and by the sea, the distance is raised to 7 to 12 km.

As for Greenfield, there is no wifi, Bluetooth, or other signals to compete with drones for bandwidth, which is the perfect flying environment.

Of course, the shortcomings are not without the lack of GPS assistance, it is difficult for the drone to achieve accurate hovering, and functions such as planning routes cannot be used, which greatly increases the risk of bombing.

However, Li Yu didn't have a choice now, he turned off the obstacle avoidance function of the drone, operated the drone to rise another hundred meters, to ensure that it would not be easily discovered by the people below, and then controlled it to fly towards the castle.

At night, the pleasant evening breeze blowing from time to time makes the drone shake and drift in the air, and at such times, Li Yu also has to correct the direction of movement of the drone by hitting the rod.

Fortunately, even if the vision system is difficult to locate due to the dark environment around it, and the GPS is lost, the aircraft will still provide a basic attitude mode to help stabilize the body and greatly reduce the risk of a crash.

In the end, Li Yu controlled the drone and crossed the high wall of Teacup Fort without danger, without alarming the army outside the city, and the people in the castle did not know anything about the arrival of this uninvited guest.

Even if someone unintentionally raised their head, they would probably only think that it was just a strange bird passing by from high in the sky.

Li Yu looked at the guards on the city wall in turn through the real-time images transmitted by the camera.

Miss Rabbit was also by his side, in charge of identifying Alfred from it.

As Li Yu adjusted the zoom camera equipped on the drone, the faces were zoomed in and enlarged, and Ireya on the side exclaimed again and again.

But Miss Rabbit is already a little numb at this point.

Li Yu first helped her awaken the sleeping ancient spirit in the necklace tonight, and then summoned the metal divine bird to fly to the sky, and with the help of the eye of the divine bird, she could see everything around her.

The girl was in shock almost all the time, even if Li Yu suddenly shouted "My old grandson is gone" at this moment, and then stepped on the auspicious clouds, turning out 108,000 miles with one heel, it is estimated that Miss Rabbit will not be too surprised.

At most, he is chanting below, Great Sage, quickly collect the supernatural powers!

The half of the face not far away was not much better than her, and when the drone took off, Jude's whole person seemed to be out of his body with him.

He stood still, staring at the little black dot in the air, motionless.

It was like seeing a human cub working on an excavator for the first time, and he couldn't take his eyes off it, and he couldn't stop muttering, "There must be a soul in there!" Yes, there must be a soul!! Nonsense like that.

Li Yu controlled the drone to circle over the castle, but he could not find any trace of the old knight.

Ilea volunteered to lead the way into the stone castle, but Li Yu gave up the idea after thinking about it.

After entering the stone fort, due to the barrier of those heavy stone walls, the signal will definitely deteriorate, the risk of blowing up the plane will also increase, and in the cramped and small space, it is difficult for the drone to avoid if it encounters any accidents.

So in the end, Li Yu chose to push the joystick and order the drone to descend in front of a soldier.

When it was almost twenty meters high, the noise of the four pairs of propellers woke up the soldier who was napping.

He rubbed his eyes, looked in the direction the voice came from, and then froze.

In order to let him better see the appearance of the aircraft, Li Yu controlled the drone to drop some heights.

As a result, the guy screamed, threw the spear and shield in his hand to the ground, and decisively left work early, and he didn't know where to run.

Li Yu had no choice but to let the flying machine find another soldier on the city wall.

The man was much bolder, and he drew his weapon and waved it continuously, as if trying to scare away the little thing in the sky that had no wings but could fly.

Li Yu was also forced to admire his combat skills for a while.

Fortunately, when he realized that his attack range was probably not enough to reach the drone, he finally made the right choice, and while being on guard, he called a companion to inform the people in the stone castle.

Just when Li Yu had just relaxed his vigilance, an arrow flew out of nowhere and went straight to the drone in the air!

Caught off guard, Li Yu didn't have time to make any operations at all, and in the end it was a gust of evening wind that happened to blow to save him, and the drone was drifted out of a short distance by this gust of evening wind.

But he inadvertently avoided this fatal arrow.

Li Yu did not hesitate, immediately raised the height of the drone, and continued to move irregularly in the air, so the next few arrows failed to pose any threat to the drone.

After a little more waiting, an old man who looked to be about fifty or sixty years old in armor came out of the castle and climbed the stone wall.

He narrowed his eyes and took a closer look at the thing in the sky.

And Li Yu is also observing him through the drone's camera.

The man was tall, athletic, with resolute eyes, wrinkled but not aged face, his silver hair was meticulously groomed, and the armor on his body was clean.

But unlike the ornate looks that many of the great nobles used to flatter their heroic posture, the armor was clearly a certain age, and if you looked closely, many of them were pitted, faithfully recording the fierce battles of the previous battles for its owner, and the rabbit coat of arms on his right arm showed the family he was loyal to.

He also held a yew longbow in his hand, nearly two meters long.

Receiving a war arrow from the hand of the squire beside him, the old knight bent his bow and arrow, and the narrow dagger-shaped arrow glowed with cold light in the night.

In the end, however, he did not shoot the arrow.

After lowering his longbow again, he also gestured to the archers around him, asking them to lay down their weapons as well.

The men looked at each other and eventually did as they were told.

Li Yu also turned to look at Ilea, and the girl nodded at him, "That person is Alfred, my guardian knight." ”

When Li Yu heard this, he took control of the DJI Mini 3 Pro and carried the ruby hanging below and Ilea's handwritten letter to fall down.