In the 21st century.

Aircraft parameters generally fall into two types:

Non-computable parameters and computable parameters.

The former is typically represented by aerodynamic data.

Friends who have participated in aircraft design should know this.

Due to the non-computability of some data, aircraft design often involves observations via wind tunnels.

For instance, tracer particles combined with laser sheet light can qualitatively observe flow field shapes, but it is not precise enough for quantitative flow field analysis.

To truly measure flow fields, PIV technology has developed in recent years.

Which involves using a high-speed camera to capture two consecutive images on the same section.

For the same particle.

There is a time interval between the two images, thus the change in recorded position allows for distance computation of displacement.

Knowing the interval of time between the two images, the particle's velocity can be calculated.

If the velocities of all particles on this section are calculated, a real-time velocity vector field is obtained.

By continuously capturing 100 images, the changes in velocity vectors can be seen, and this method collects flow field data.

So, against a modern background.

Designing an aircraft is quite difficult; costs will be very, very high, and most people simply can't afford it.

When a wind tunnel sounds, it means gold by the thousands, this is no joke.

However, the model Xu Yun is working on this time is very simple, so wind tunnel assistance for design isn't necessary, the main focus remains on computable parameters.

Thus, as time passes, the entire project continues steadily.

....

Four months later.

Still at the Artifact Bureau.

At this moment.

Xu Yun, along with Xiaozhao and Old Zhong, follows behind an elderly man in his seventies, walking slowly.

They walked like this for roughly a quarter of an hour.

After passing through a stern security line, a small house suddenly appeared before them.

The elderly man stopped before the house listening to pigs squeal, then turned respectfully towards Xiaozhao and saluted, saying:

"Your Highness, General Zhong, Mr. Wang, here it is."

Xiaozhao glanced around, nodded, and pointed to the door:

"Master Su, open the door."

The man with the surname Su hurriedly replied yes, took out a key from his sleeve, and opened the workspace's door.

He then made a gesture to invite them in:

"Please enter, this old chap goes first to lead the way."

The three of them followed inside.

This workspace covered about a hundred square meters, and a set of equipment was placed at its center.

About half of this equipment was related to distillation, the rest consisted of several glass vessels and numerous bottles and jars.

The size of the glass vessels was somewhat similar to 15-liter buckets from water dispensers; the kind that, with boys around, girls would say they can't lift, but when no boys are present, they'd lift it single-handedly.

At this moment.

Each glass vessel was filled with some transparent solution, appearing slightly viscous, not quite like water.

Floating within were some silver, chrysanthemum-like plants.

Beside the largest glass vessel, Brother Lv was panting as he spun it around.

Xu Yun walked over to the vessel, observing the internal situation carefully through its glass cover.

Then he casually fed Brother Lv a handful of grass and asked the older man:

"Master Su, how long have those Silver Chrysanthemums been immersed?"

The man with the surname Su paused for a moment, calculating the time mentally, and replied:

"About ten hours or so."

Xu Yun thought for a while and nodded:

"Let's let the donkey rest for a bit."

The Su Master he referred to, sharing the same surname as Old Su, was named Su Qi, an experienced master from the Zhejiang East Road Clothing Bureau.

Different from Siegfried.

Su Qi wasn't a craftsman, but he was extremely experienced with dyes.

The assembly module of Xu Yun's aircraft design comprised various segments, most equipment production required the skill of Siegfried-like elite craftsmen.

But certain segments needed professionals like Su Qi.

For instance...

The production of rubber-like materials.

Friends who slightly understand engine structure might know.

Besides steel, various alloys, or ceramics, engines have an essential material:

That is rubber components.

Examples include engine oil pipes, crankshaft oil seals, valve oil seals, O-rings, all requiring various rubber components.

Rubber's origin is Brazil, and according to the normal timeline, it will take hundreds of years more before being brought to Europe by Gaul explorers from America.

And it wasn't until the late 19th century that rubber finally became an industrial material.

Thus, at present in Great Song, it is impossible to find the standard meaning of natural rubber.

Of course.

Besides natural rubber.

There is a synthetic rubber category, but this requires enough material for polymerization reactions.

Even the simplest dimethyl butadiene is beyond the current reach of Great Song's industry.

However, being a physicist, Xu Yun indicates besides standard rubber, there are ways to produce rubber-like materials.

For instance, widely spread in later generations....

Eucommia rubber.

Eucommia is a unique monoculture plant in our country.

Eucommia rubber is a natural high-polymer material, also known as trans-isoprene rubber.

In the 21st century of future generations.

Our homeland is also heavily developing this material, its technical value is very high, and the prospects are quite broad.

However, Eucommia rubber's sensitivity in engine aspects is limited, its extraction process is also complex, even requiring the use of petroleum ether.

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