The base frame is selected, and the next step is the selection of the bone material.

"Do you want to choose 'calcium'?"

The material of calcium is relatively light, and the straight-shelled nautilus, which is used as a design template, also uses calcium as the main ingredient.

If you choose calcium directly, you will have to deal with a lot less things at once.

The skeletal system is not something that can be achieved overnight, and it needs to take into account the density, chemical activity, and difficulty of obtaining the new material.

After pondering for a while, Hogu dispelled the thought.

"No, calcium can't meet my expected requirements, calcium as a bone hardness is too low, to ensure protection, you need to thicken the carapace, but in this way, not to mention the space occupied, 'lighter material' does not make any sense."

The Mohs hardness of calcium is 1.75, and the Mohs hardness of skin is 1.5, so a comparison can intuitively see how soft calcium is.

Why did the original earth creatures choose calcium as their bones?

There are many reasons for this, but Hogu's main preferred explanation is the ease of obtaining the material, which caused the earth's creatures to finally choose calcium as the bone material.

In the early global environment, calcium carbonate existed in large quantities, such as calcite and limestone, and calcium carbonate was easily separated from calcium in terms of preparation.

However, what Hogu wants is performance, what he wants is a material that is strong and light enough, it can rely on cells to achieve molecular level material processing, and he dare not say anything else, but in terms of preparing elements, it can already throw off those chemical plants on the earth several streets, and it does not need to worry about the problem of material acquisition.

This can be seen from the essence of various types of elements in Huogu's reserves.

"But if it's iron, will it be too heavy?"

Hogu's mind conjured up an image of a newly designed cluster of cells resembling a straight-shelled nautilus wandering in the sea, then getting closer and closer to the bottom of the sea, and finally moving in the sea against the seabed.

"No, no, no! What was I thinking, this is not going to work! ”

"It needs to be a very light material, it has to be light enough ......"

"In other words, the density must be small, and if the density is large, the mass in the unit space will naturally be large."

This time it is indeed beyond the scope of Huogu's knowledge, its old profession is archaeological excavation, and the knowledge field it is proficient in is geology and biology, and it only stays at the high school level for mathematics, physics and chemistry.

This is still ideal, Huo Gu was already an old man in his late sixties before he became what he is today, and it has been decades since he was in high school, and it is hard to say how much he remembers.

Suddenly, Hogu remembered his time at the International Space Center, where an old friend who worked there once boasted to it about a metal - titanium.

"Titanium, that guy from Old Tang blew this metal into the sky in front of me, and what did he say about the earth's first-generation space battleship, and it must have used this kind of metal......"

"Cut, I'm not afraid of the wind flashing my tongue when I say this kind of thing, I don't even have a space elevator yet, the International Space Station is just a grain of rice, and a space battleship, obviously I haven't even touched the edge, I know that I brag in front of a layman like me, and I have to go to manned space flight to toss a Mars ......"

Thinking of this, Huo Gudu was resentful, it was precisely because he was old that an old bone could not withstand the reaction force of the rocket boost, so he was reduced to the International Space Center and participated in remote command work.

Now that you've all envisioned space battleships, let's hurry up and build a space elevator! I really want to participate in the exploration of Mars in person! - If there had been a space elevator back then, Hoguna's aging body would no longer be an obstacle to his journey to Mars.

After venting, Hogu also returned to his original composure and looked at the metal 'titanium'.

"As an aerospace metal, it should be undoubtedly resistant to high temperatures and pressures......"

"There is also quality, because it is still rocket transportation, so the material is developed in the direction of 'light' as much as possible, which is exactly in line with my current needs."

"Well, let's decide 'titanium'."

However, Huo Gu did not know much about this metal, after all, he was a layman who could only do archaeological excavation work, whether it was in the field of industry or aerospace materials.

But it doesn't matter, if you don't understand, you can learn, there are real things, or you can experiment how you want, it's just that it will take some time to explore.

With the bone material selected, Hogu began to get information about Titanium.

The first question is whether this metal can stably exist on the planet where Hogu is now.

This is very important, even if the properties of titanium are good in all aspects, but in an environment that can easily make it react, it is in vain, and there is nothing to be done to provide a protective shell.

Hogu's method is very simple and crude, squeezing a small amount of titanium from the cavity into the ocean, and then looking at it with the naked eye on the rhizome system.

Titanium in the ocean is entangled in a single tendril, and while preventing it from being washed away by currents, it also takes on the task of sensing temperature changes, and any chemical reaction will be accompanied by physical changes in endothermic or exothermic.

After making sure that there were no changes, Hogu took back the titanium and created a cavity on a section of the taproot on the seafloor that was specially designed for experimentation.

The recovered titanium was put into that cavity, and Hogu followed the periodic table, one by one, from hydrogen, helium, lithium, and boron...... In this way, the elements are transported into the experimental cavity, and after confirming that there is no reaction, the elements are withdrawn, new elements are injected, and so on.

After the aqueous environment is over, try to repeat the experiment using the air environment to see how it changes in the air environment...... Then there is a pure gas experiment of various gases to see how titanium changes in this environment...... Then there is the change in the waters of strong acids or alkalis......

To use titanium, it is necessary to have a comprehensive understanding of titanium, these tests are indispensable or sloppy, and must be carried out carefully and effectively in order to obtain accurate data.

Of course, other aspects of the matter are not left behind, and step-by-step experimentation is a tedious and very time-consuming thing, so Hogu chose to solve other problems in parallel with the new design.

The next step is to design and make the best use of every inch of space inside the cone housing.

Hogu has not forgotten the original design criteria - to design individuals that can survive the super wave!