Fatal's aircraft replica project promoted by the crown prince cannot be said to be fruitless, but it is just not good enough.
The plane's name is Taratawa, which means Lord of the Sky.
At present, it has achieved ten consecutive flights without crashes, but it is obviously still not enough to meet the proposition of "Lord of the Sky".
The problems faced range from big to small, and each one makes one’s head feel as uncomfortable as grout.
The biggest problem is that there is no concept of "aerodynamic force".
In fact, so far, "Pneumatics" in the Phoenix Kingdom is still not a public course, neither at the Black Forest Magic Academy nor the newly opened Obsidian University. The people in Fatel will not understand. This is because aerodynamics itself is a branch of fluid mechanics, but the content is very large and is not suitable as a university tutorial. Fluid mechanics is currently only an elective course in the physics department. Not much content.
The non-disclosure of system knowledge leads to the fact that in the process of imitation, one can only copy the homework without knowing why it is done like this.
The early imitation work completely copied the wooden man, but the wooden man was processed and assembled from two integrated structures grown from the sacred tree. It cannot be copied with logs, so there must be some changes and additional connection points.
The first replica aircraft built under such conditions completed its first test flight, but lost control and crashed during the second test flight for unknown reasons.
After launching a wave of espionage work, he obtained "Aerodynamics" from the Civilian Aircraft Factory.
This book is very rough and does not explain how airplanes operate. It just explains why airplanes can fly and the effects of vortices, turbulence, etc. on moving objects.
No one has studied it, nor would they know that this is what it is like to get started with aerodynamics. After all, aerodynamics is not just in one direction of the aircraft. When the ground movement speed reaches a certain level, aerodynamics must also be considered. The introductory course covers aerodynamics in each direction. In summary, the thickness of the book will not be controlled.
The crown prince also wants to use spies to dig deeper, but the part involving aircraft is also a magic weapon for civilian aircraft factories, and the confidentiality will be higher. Because each factory has different directions, there will be more detailed classifications, and it will be difficult to figure out everything in a while. .
We still have to rely on the imitation team to find out on their own.
Knowledge is unlike other things. If there is no inheritance, you have to learn it yourself, which requires an extraordinary brain. Even a great magician may not be qualified.
In terms of craftsmanship and materials, I can touch it, but the progress is also very slow.
The crown prince is the next monarch in theory, but as long as he doesn't sit in that position for a day, he won't be able to do it accurately, and he was a little anxious when Upfapu promoted the installation of the magic rifle.
From the perspective of an onlooker, the Crown Prince's anxiety has nothing to do with Upfapp himself. It's just that because the proposal to "purchase a magic rifle to replace imitation" was rejected by King VI, he felt that he might not be so stable.
In short, things in the palace were very complicated, and the result was that the crown prince spent money to get two more planes for reverse engineering.
This time it was more reliable, and I specially bought a wooden man replacement model Feathered Serpent 1 produced by Windward Spread Wings (Pangxun Factory).
The reputation of this aircraft is relatively poor. Its controllability, flight attitude stability, carrying capacity, and ground handling workload are all 10 to 20 percentage points behind that of the Wooden Man. However, for imitation teams, this non-integrated aircraft is easier to Understand and imitate.
….
With the next few prototypes, we finally figured out how the first plane crashed.
To put it simply, the connection method between materials was incorrect. The connection points became loose during flight, which caused a series of chain reactions and caused the aircraft to lose control.
The Wooden Man is an integrated aircraft, with only two large parts: the wing and the fuselage. The glide type sold for export is a lower-wing model. The stress on the wing will be evenly distributed to the fuselage. The requirements for the connection form are very low and cannot be used. As a connection reference for normal components.
Specifically, the two major parts of the wooden man are connected through riveted anchor bolts. This type of bolt is long and has limited tolerance to lateral forces. This is entirely due to the combination form of the body and the unique shape of the lower wing. The direction of force does not need to consider the lateral force endured by the link.
However, if the fuselage is composed of more than a dozen parts and the flight direction is normal, most of the connecting parts
Especially those located on the side of the fuselage, they mainly bear lateral force, and this kind of connection standard cannot be found on wooden figures at all. The imitation team instinctively used a structure with wooden mortise and tenon grooves and anchor bolts.
Feathered Serpent 1 actually solves this problem.
The Feathered Serpent 1's fuselage is divided into parts, and the connection is replaced by metal. A circle of metal covers the gap, just like the iron hoop of a wooden barrel, and then a row of large-headed countersunk rivets are drilled on both sides.
The difference is that the average thickness of the side walls of the wooden aircraft's fuselage is only 1.6 centimeters, and in some places it is less than that. Using the wooden mortise and tenon embedding method, even if only half of each side is cut off, the wood itself will become unbearable. In riveting, the connector itself is a rigid obstacle to tearing the wood. The denser the riveting, the lower the wood's force-bearing capacity.
The use of metal plates for connection does not change the thickness of the wood itself, which is equivalent to strengthening it with patches. Coupled with the countersunk riveting form, it can improve the stress state of a single point as much as possible.
Following this idea, the Taratava was improved, and finally there was no more looseness.
I just made a few test flights carrying cargo, but there were other problems.
This time it's a tightrope.
On the outside, the aircraft controls its flight attitude through the rudder surface, while inside it relies on gears, cables, pulleys, reset springs, etc. to control the rudder surface.
The greater the weight, the greater the inertial force, and the stronger the force required to change the posture. This "rule" cannot be avoided just because it is flying, and the stress state of the steel cable will naturally increase accordingly.
The name of the steel rope is very traditional, but its technical content is not traditional at all.
Iron chain production has five processes: cold drawing, shearing, bending, welding and annealing. Steel cables or steel strands only have two layers: cold drawing and winding. The actual requirements for steel are much higher. When it reaches 7x7x "x", there must be an oil-retaining core wire (lubrication) inside, which is a matter of structural mechanics and materials science. crystallization.
Several prototypes bought by the crown prince all used standard 7x7 steel cables, but the difficulty was still too high for the steel industry that had been severely beaten by the floating island process when Fatal was just starting out. Not to mention that the steel cables currently used by the Phoenix Kingdom have an additional "calming steel" attribute compared to before they were transformed into floating islands.
Killed steel has unique advantages in dealing with repeated bending and wear resistance, and steel ropes were also the first categories to benefit from this technology.
….
It is steel that has undergone a deoxidation process. As long as the ingredient list and test indicators remain unchanged, the wear resistance will be several or even dozens of percentage points better than that of boiling steel, and even the thermal conductivity coefficient will be slightly higher. A relatively simple material enhancement approach, used in conjunction with heat treatment, is sufficient to meet most needs, but the upper limit is still limited by the base material.
In terms of development, killed steel is already a relatively high-end technology in the steel industry. Phoenix Steel only developed it after the oxygen blowing conditions became available and the gas protection production process had developed to a certain extent in the past ten years.
The Crown Prince's imitation team spent a lot of labor costs and urgently hand-built some equipment. They only produced a 7x5 steel cable, which was thicker than the one used in the prototype.
Before this, there was an imitation aircraft that used iron chains. Of course, by the time the imitation steel cable came out, it had already passed away.
Under the same material properties, the iron chain lags behind the steel cable in two important indicators of tensile strength and shear resistance. It only takes advantage of the corrosion resistance index due to its relatively small surface area. Therefore, steel chains are generally not considered at sea. So. But what is important now is the transmission of aircraft operation. It is idle to consider the rust problem in a wooden aircraft.
Naturally, the imitation team did not consider the level of tension, shear stress, or corrosion. It was just a desperate search for a substitute when the steel rope replacement was difficult to deliver.
Unfortunately, a recent accident showed that our own 7x5 steel cable is not that easy to use.
"If that doesn't work, let's import some steel cables." Seeing that the prototype had flown ten times without crashing, and the inspections and reinforcements before each takeoff were increasing, the staff couldn't help but give the crown prince advice.
But the Crown Prince has Crown Prince ideas.
What he cares about is not his own industry.
level, but: "It's not your place to say this, and I don't want to know it either."
"...I understand."
fat man in wine glass
