Seeing that everyone was attracted by the design drawings on the computer, Chu Hao suddenly felt a sense of humor.

He smiled self-deprecatingly, he sometimes found that the feeling of being a prophet was not very good, and he had not felt such excitement and excitement as Wang Yongzhi for a long time.

Everything is unremarkable, and the heart is like water.

But it is also said that the technologies in front of them, which can make Wang Yongzhi and them excited, are not only backward for Chu Hao, but can even be said to be wrong.

Let's not talk about the engine, let's talk about the fuel required for the engine, China and the former Soviet Union, all of which use dimethylhydrazine-nitrogen tetroxide as engine fuel.

The problem with metadimethylhydrazine-nitrous tetroxide is that the specific impulse is not high, and it is highly toxic, the only advantage is that it is cheap and stable, plus there is no need for an ignition device, which can save some space and weight and increase thrust.

At room temperature, if dimethylhydrazine-nitrogen tetroxide is added, it can be kept in a ready state for launch for more than half a month.

As for the liquid oxygen kerosene, which is commonly used in the West, it is better than dimethylhydrazine-nitrous oxide in both density and specific impulse, but it has one of the biggest problems, that is, the engine life is too low.

Friends who drive cars know the trouble of cleaning up the carbon deposits in the engine, and the rocket engine far exceeds the civilian engine in terms of fuel flow and precision requirements, and the explosion can be blocked in seconds. Carbon deposition coking is a dead knot that all kerosene engines can't get around, and at present, it has been exhausted to ensure that the engine does not have problems within hundreds of seconds of a single operation, and it is too difficult to reuse the technology.

As for the next-generation technology, liquid hydrogen and liquid oxygen are more than 30 percent higher than the specific impulse of dimethylhydrazine-nitrogen tetroxide and liquid oxygen kerosene, which is said to be a good engine fuel.

However, hydrogen is the least dense of known gases, and is 14 times the volume of the same air compared to air, which means that even if liquefied, liquid hydrogen and liquid nitrogen solutions would need to carry more fuel than other options.

In addition, the filling of liquid hydrogen and liquid nitrogen is very dangerous, static electricity is enough to detonate, and the biggest problem is that the stability is not good.

Whether it is metamethylhydrazine-nitrous tetroxide, liquid hydrogen kerosene, liquid hydrogen and liquid nitrogen, they all face a terrible chemical reaction caused by an accident that cannot be launched in time and the temperature rises.

As the temperature rises, the cryogenic liquid will continue to evaporate into gas, which can cause the internal pressure to become excessive and explode.

Metamethylhydrazine-nitrogen tetroxide can be stored for half a month, and only some runaway fuel needs to be filled, while liquid hydrogen and liquid nitrogen must be discharged if it is left for more than 24 hours.

Add to that liquid hydrogen and liquid nitrogen, which requires every ignition to combust, which adds to the complexity of the engine and the addition of a system that can go wrong.

The other most important problem is a very serious paradox, if you want to fly farther, you need more fuel, and if you increase the fuel, you need more weight, and the more weight requires more fuel.

In other words, a large part of the fuel added is actually used to carry itself, which is more wasteful.

Based on the fuel used today, it can be said that the average distance of sending humans to the moon, 380,000 kilometers away, is already the limit.

As for the next target for human exploration, Mars, the closest distance from the Earth is 56 million kilometers, which is 1.5 times the distance between the Moon and the Earth.

Also, the closest distance to Mars only occurs once every fifteen years, so if you miss it, you're sorry.

Maybe you need to run seven times the distance, because the farthest distance between Mars and the Earth is 400 million kilometers, which is 10,000 times the circumference of the Earth, which means that a trip to Mars is equivalent to 10,000 trips around the world.

Even a rover would take more than 500 days to make a round trip to Mars.

It also means that it is impossible to send humans to Mars with these engine fuels.

So in Chu Hao's view, these are not qualified aero engine fuels, not to mention the various black technologies of the Qin and Han Empires, for now, Chu Hao thinks that the more reliable one is nuclear-powered rockets.

Tsiolkovsky, the father of Russian astronautics, predicted: "A one-ton rocket with only a pinch of radium is enough to break all gravitational ties with the solar system." ”

However, if you build a nuclear-powered rocket, not to mention how to miniaturize nuclear power, the core temperature of the engine will soar if you use nuclear power as the power source, and how to avoid the impact of nuclear radiation on various electronic components.

Basically, it can be said that the existing space system has been completely overturned and rebuilt.

Let's not discuss how difficult it is to do this, even if it is too late in time, Chu Hao does not have so much time to toss these, and if he does this, it is really pulling out the seedlings.

It can even be said that Chu Hao is destroying this generation of astronauts, and Chu Hao feels that the spirit of Chinese astronauts is more important than technology.

After a long time, Wang Yongzhi pushed down his glasses, rubbed his somewhat astringent eyes, turned his head to Chu Hao and said, "This is also a liquid hydrogen and liquid nitrogen engine?"

From Wang Yongzhi's appearance at this time, it can still be seen that it is difficult to hide his excitement.

Chu Hao nodded, since he couldn't get the nuclear-powered rocket out, he could only use the liquid hydrogen and liquid nitrogen rocket to make a living.

"Statistically, it's advanced, it should be even more advanced than Delta IV. Wang Yongzhi swallowed, although he already believed in Chu Hao very much, he still felt a little unbelievable at this time.

Delta IV is the tallest launch vehicle in service in the United States, this rocket can deliver up to 28.79 tons of payload into low-Earth orbit. 11 tons of payload were put into geosynchronous orbit, where the communications satellite is located. It has also been reported to be able to send 11 tons of payload to the moon and 8.8 tons of payload to Mars orbit.

And Huaxia not to mention now, that is, in 2016, the developed Chang 5E, its technical level has just reached the United States and the former Soviet Union in the sixties of the last century.

The Chang-5E can send a payload of 25 tons to low-Earth orbit, which is actually similar to the Delta IV from this point of view, but as I said before, aerospace is a miracle industry.

The Chang-5E is composed of two liquid nitrogen and liquid hydrogen engines, but the thrust is insufficient, and four kerosene boosters are bundled on the outside of each liquid hydrogen and liquid nitrogen engine, so that the Chang-5E uses ten space engines.

The Delta IV only uses three RS68A engines, which makes the take-off weight of the Delta IV 150 tons lighter than that of the Chang 5E.

The technology gap is here.

Now Chu Hao suddenly put a most advanced rocket engine in the United States in front of Wang Yongzhi, how could he dare to believe that if it wasn't for the trust in Chu Hao that had been established these times.

That is, he was slapped in the face a lot, and he had already questioned it.

At the very least, you have to beat a drum in your heart.