Personal flying machines sound very high, in fact, with the current technology to make it is not as difficult as imagined, everything is ready-made, in fact, there have been foreign cattle people to make an extremely small and practical personal aircraft, on the Internet has been popular for several years.

It's just that the price is too high, the difficulty of driving is too great, there are great safety hazards and the flight time is too short, and many other problems, so although the person's aircraft is not popular, it has never been able to be mass-produced and popularized.

There are also quotations for sale on the Internet, but it takes nearly 2 million to buy the finished product, so Zhang Tiancheng can only retreat and prepare his own copycat, of course, the things that come out must be much worse than the flying machine invented by foreign cattle.

It is very simple and crude, completely canceling the balance auxiliary flight system, the whole aircraft only has the simplest throttle to control the size of thrust output, and everything else completely relies on the body's strong balance ability to actively adjust the control.

Because the personal aircraft needs to be put into the space backpack, and is ready to fly into the space backpack directly after flying into the air to facilitate gliding flight, so there are several basic restrictions on the DIY aircraft, the first is the size, the length, width and height must have a size control within 40 cm in order to smoothly put into the storage space.

There is also a fuel tank that can not be invented by foreign friends to make a backpack and the aircraft separated, must be integrated together, in addition to the shoes fixed on the aircraft must also be replaced with a style similar to slippers, so that it is convenient to take off and take back the aircraft at any time, of course, these conditions have actually been negotiated when looking for the merchant to customize the shell, there is no problem.

Everything was ready-made, and it was quite easy to install, but it took less than three hours to assemble the personal aircraft by installing four small turbojets into a fixed position, and then connecting the oil pipes and very simple control lines.

The size of the aircraft: 50 cm long left and right, 39 cm wide at the front and back, and 48 cm high at the top and bottom.

Due to the size of the aircraft, the fuel tank is relatively small, and can only hold 10 liters of fuel at most, while a turbojet with 30 kg of thrust needs to consume 0.98 liters of fuel in one minute at full power output. If all four turbojets are at full load, 10 liters of fuel can only last a little more than two and a half minutes of flight time, and even if they don't usually use full power output, it seems that they can only fly for three or five minutes.

Such a little flight time is indeed far from enough, but it is completely enough for Zhang Tiancheng, and the main purpose of making this aircraft is not to use it directly to fly and rush, but to use this aircraft to push himself into the air, and then use the dragon cloak to glide at high speed to achieve the purpose of rapid maneuvering.

I went to the roof of the building to fix the aircraft and tried to ignite, which went very smoothly, but I didn't dare to further the throttle to continue to try the strong thrust.

It's really too big for this thing, if it's really full power output, the movement will be enough for people within a few kilometers to hear, and the temperature of the tail flame is as high as six or seven hundred degrees, so there is no suitable site to really dare to test indiscriminately.

However, since the ignition was successful, it means that the oil circuit and line link are fine, the total thrust of the four turbojet engines is 120 kg, and the weight of the aircraft after filling up the fuel is only 19 kg, so the theoretical load capacity is 101 kg.

Of course, if you add the blessing of the dragon cloak, the load capacity can reach about 124 kg, and with the improvement of the fit of the cloak, this data can continue to increase a lot, and after the next mission starts, the maximum payload of more than 130 kg is not a problem at all.

The maximum thrust minus the 23% reduction effect of the cloak on body weight can achieve the maximum ascent acceleration of more than 0.7G after some calculations, and if there is no fault with the full power output for more than two minutes, it can even push itself to a height of five or six thousand meters. Of course, this is only theoretical data, and the specific height of how high it can fly has to be tested to know, and for the sake of safety, the current flight altitude is best controlled within 120 meters.

Take the aircraft back to the room, the thing is done, but where to test the practice is indeed a very serious question, the turbojet engine is too much after the start-up, and it is basically impossible to test quietly, even if it is to go to the deep mountains, and it is not safe, maybe you will accidentally set the mountains and forests on fire.

And should the test flight of this kind of personal aircraft go to the relevant departments for filing? What is the reporting process? Wouldn't it be too noticeable to suddenly make something so dangerous and exciting?

Suddenly found that although something was made, it was still a very troublesome thing to experiment and practice, but I didn't know if there would be a problem with this thing if I didn't experiment, and I couldn't find the problem in time, so I was busy in vain.

"Maybe it's better to go to a sparsely populated place to do experiments, and it's a good choice to go to the Inner Mongolia prairie or the Gobi Desert in Xinjiang......

"By the way, it is more practical to go to Tibet, not only to test the aircraft, but also to adapt to altitude sickness by the way, and further improve the survivability in various environments."

After thinking about it carefully, he quickly decided on the location of the test vehicle, and then sorted out the space backpack and put away the personal aircraft, only then did he remember that he hadn't even eaten dinner, but it was a little strange that he didn't feel extremely serious hunger, and even felt that the energy gathered in his chest was slowly transmitting to the stomach, and it seemed that the mysterious energy could be consumed as food.

Maybe the current self will not be starved to death before those energies are consumed, if this is the case, then as long as he goes to a world full of spiritual energy, can he already survive directly by absorbing the spiritual energy of heaven and earth? In other words, what he cultivated was not the internal strength of the martial arts world at all, but something similar to the true yuan power of a cultivator. Although the new discovery is amazing, in order to avoid wasting energy, I still boiled two packets of instant noodles and added several eggs to make do with dinner.

Suddenly, the phone rang, but it was Qianqian, who she hadn't seen for a long time, calling, at least for Zhang Tiancheng, who hadn't seen her for a long time, at least for more than a year.

"Big girl, what are you doing!"

"Brother Zhang didn't have a supper together when he was free!"

“…… You're not going to be pestered again, are you? ”

"How is that possible...... It's a very, very small thing to ask you to help with, and it's a gesture for you! ”

"What the hell is going on?"

"You'll know when you arrive, don't worry about eating supper without you having to pay the bill!"

"Sister, my brother is such a stingy person, where?"

"Linjiang Road No. XX food stall!"

"Oh, I'll be here in twenty minutes!" Saying that, he put down the phone, just looked at a big bowl of noodles, and in line with the principle of not wasting it, he still ate it at a very fast speed, and then drove out of the car.