The Su God of the Reopening of the Sports Arena

Chapter 2249: Su Shen has begun! Let all the masters' starts become scumbags

Chapter 2249: Su Shen has begun! Let all the masters' starts... become scumbags

Su Shen's shot.

Everything is fully prepared.

He knows very well that in the field of track and field sprinting, subtle optimization of starting technique can often be the key factor in determining victory or defeat.

Especially for people like me who have great potential.

Want to defeat opponents of the same level.

That's what is needed.

Because your opponent is at the same level as you, you cannot use your average strength to crush him.

You need to capitalize on your strengths.

There is no doubt that Bolt is such an opponent.

He indeed only had one opponent in this match.

I'm sure Bolt himself is well aware of this.

Both of them have clear minds.

When Su Bingtian started running, he bent his arms to 137.5 degrees.

With the elbow as the vertex, the angle formed by the upper arm and forearm, and the length ratio of the upper arm to the forearm are just close to the golden ratio value.

This angle allows the elbows to fit naturally into the sides of the torso, creating a compact body shape.

From the perspective of human bone and muscle structure, a 137.5° arm flexion angle can activate the coordinated force of the upper limb muscles.

At this time, the main flexor and extensor muscles such as the biceps and triceps are in the optimal tension state, which not only avoids muscle tension and fatigue caused by excessive bending, but also avoids the inefficiency of force when the arms are straightened.

At the same time, the relative positions of joints such as the scapula and clavicle are also optimized due to this angle, reducing redundant movements during upper limb movement and making energy transfer more direct and efficient.

but.

These are all basic.

This is what Su Shen is going to show now.

But it's not just this.

This is just normal.

The question is...

Lausanne.

Is this the case with him?
No.

He is not in a normal situation.

Because this year's Lausanne will be the highlight of all Diamond Leagues and even all major competitions.

The best shot with wind speed.

Full Wind 2.0.

Plus a small plateau.

Here you can maximize all attributes within the legal range.

Indeed, under favorable wind conditions, by dynamically adjusting the golden ratio angle of approximately 137.5°, a balance between efficient use of natural wind power and technical stability can be achieved.

But the problem is that the wind speed is not strong or there is no wind.

But what if the wind speed is very high?

Of course, you can continue to make fine adjustments.

Maximize the golden ratio angle effect.

This is what athletes should do. After mastering a set of technical systems or theories, they should not apply them mechanically, but adapt them according to their own physiological conditions and the external conditions of the competition.

Make constant adjustments.

This is true control.

And Su Shen has this ability.

The first is the mechanical decomposition and utilization of wind force.

According to the principles of aerodynamics, the force generated by a tailwind can be decomposed into thrust and lift.

The thrust is directed behind the body, providing the athlete with additional forward momentum.

The lift force is perpendicular to the body surface and may cause the center of gravity to be unstable.

Adjust your arm angle in a tailwind environment - essentially by optimizing your body posture.

Maximize thrust utilization efficiency and reduce lift impact.

So what is the adjustment angle?
The answer given by Su Shen here is——

140.7 degrees.

Because when the arm bend angle increases slightly from 137.5° to around 140°…the curvature formed by the outer side of the arm and the torso increases, creating a “diversion effect” similar to that of an airplane wing.

According to Bernoulli's principle, the difference in air flow speed on the body surface will produce a pressure difference, causing the tailwind to flow more smoothly along both sides of the body, thereby enhancing the thrust conversion efficiency.

Su Shen’s experimental data shows that reasonable adjustment of the crank arm angle can increase the utilization rate of downwind thrust by 15%-20%.

Although it is a theoretical effect, the theoretical effect is enough.

The remaining.

That's the part that people have to do.

After the thrust strengthening mechanism is completed.

The next step is lift suppression strategy.

Too strong a tailwind may create an upward lift, causing your body to feel "floating" at the moment of starting.

This is something that must be considered.

Su Shen’s idea is to increase the arm bending angle so that the arms and torso form a more compact overall structure.

Reduces airflow buildup under the body.

Reduce lift generation.

At the same time, fine-tune the forward tilt angle of the torso.

Increased from the conventional 50° to 55°, the gravity component is used to offset part of the lift and maintain body stability.

After going out, optimize the swing arm trajectory.

Because the swing frequency is accelerated when the wind is blowing, the relative wind speed of the arm swing increases. At this time, increasing the crank angle can reduce the lateral displacement of the swing arm and reduce the eddy current and turbulence caused by the rapid swing of the arm.

According to boundary layer theory, the smooth curved surface of the arm can delay airflow separation and reduce air resistance by about 8%-12%.

At the same time, the 140° arm angle can also make the shoulders, arms and torso form a smoother curve.

Further reduce the frontal area.

At this angle, the frontal projection area of the body can be reduced by 7%-9%.

Effectively reduce the negative impact of air resistance on acceleration.

This is called body streamlining adaptation.

When starting a race with the wind behind you, the adjustment of the arm flexion angle needs to be coordinated with the lower limb pushing off the ground, so that the wind force and your own strength can be organically combined. This is what you should do.

of course.

If you're not careful, you'll mess it up.

It depends on your choice.

Su Shen’s choice is of course——

Face the difficulties head on.

Leverage principle adjustment.

The slightly increased arm bending angle increases the lever arm of the arm swing. According to the lever formula T = Fxd (T is torque, F is force, and d is lever arm), when the muscle strength remains unchanged, the torque generated by the arm swing increases, which can drive the torso forward more forcefully.

After this adjustment.

When the arms are bent at 140°, the torque output of the upper limbs to the trunk can be increased by 10%-12%.

The tailwind helps the body accelerate faster, and the timing synchronization of arm bending and swinging and lower limb pushing off the ground is particularly critical.

Through neuromuscular control, Su Shen can control the synchronization error between arm swing rhythm and ground pushing frequency within 50 milliseconds.

Make sure that every arm swing can enhance the lower limbs' pushing off the ground, forming a closed-loop acceleration mechanism of "arm swing-lean forward-pushing off the ground".

As for tailwind, it may cause the center of gravity to move forward too quickly, causing the body to lose balance. The adjustment of the golden section arm angle maintains stability through the following methods:

Increasing the arm bending angle will move the center of gravity backward when the arms are swung back, offsetting part of the tendency of the center of gravity to lean forward caused by the tailwind.

At the same time, lower the height of the body's center of gravity by about 3-5 cm, increase the stability of the support surface, and reduce the interference of wind on body posture.

During the arm flexion adjustment process, the core muscles, rectus abdominis, and erector spinae muscles need to work together.

Used to maintain the natural curve of the spine.

Avoid loss of force transmission caused by excessive forward lean.

Effective activation of the core muscles provides stability to the body.

And of course there are pre-programmed sport modes.

That is, before the game, the brain builds a specific action template based on wind speed data.

When the arm flexion angle is adjusted to 140°, the nervous system will preferentially activate the biceps, deltoids and other related muscle groups, shortening the reaction time from command issuance to muscle contraction by about 10-15 milliseconds.

Cooperate with the muscle spindles and tendon organs near the elbow to continuously monitor changes in arm flexion angle and provide real-time feedback of limb position information to the central nervous system.

When the wind speed changes suddenly, nerve signals can adjust the intensity of muscle contraction within 100 milliseconds to ensure movement stability.

In this way, the arm bending angle can be increased, and the inertia force of the arm swing will increase. With the help of the tailwind, the muscles only need to consume less energy to maintain rapid arm swing.

The 140-degree arm bend makes the contraction strength of the biceps, triceps and other muscle groups more uniform, avoiding fatigue of a single muscle group due to excessive exertion.

This angle reduces the rate of lactic acid accumulation in the muscles.

The adjusted bent-arm posture improves blood circulation in the upper limbs, accelerates the excretion of metabolic waste, and delays muscle fatigue.

Optimized posture can improve the efficiency of muscle oxygen supply.

Have a look.

Just a simple adjustment.

That’s a lot of preparation required.

If you don’t understand this knowledge system.

Then even if you try you will fail.

What's more, even if you know how many people dare to try it directly in the competition.

Only if you are sure that this is absolutely correct, you will dare to do it without hesitation like Su Shen.

……

"It seems like there's something wrong with Xiao Tian's arm extension?"

Yuan Guoqiang felt something was wrong and felt a little nervous.

Forget about the audience in this show.

They also have high expectations for Su Shen.

The higher the expectations, the more nervous you will be. "It's okay, Yuan."

Randy said, "This is his on-the-spot adjustment. He is now at a level where he can adjust any theoretical technique in real time."

"If he does."

"That means he now thinks this is the right thing to do."

"We can rest assured."

"What is the specific reason?"

After hearing what Randy said, Yuan Guoqiang felt a little relieved.

But I couldn't help but ask one more question.

But this time, Randy didn't give an answer.

"Hmm? Mr. Randy, did you hear what I just said?"

"I heard it. But I...can't answer it."

Ah? ? ?
Yuan Guoqiang was stunned.

Then I heard what Randy said next.

“Because I still don’t quite understand it.”

“I’m still learning.”

Yuan Guoqiang:......

Then you speak so seriously.

Isn't this something you don't understand?
Do this.

My mood, which had just calmed down, is now turbulent again.

Only Su Shen himself.

I understand in my heart.

Made by myself.

absolute.

no problem.

Let me show you the power of future science and future knowledge.

Bang——————————

first step.

Thrust enhancement mechanism and horizontal force!
When air flows over the body surface, the change in the body's curved surface causes a significant difference in airflow velocity between the outside and inside of the body.

The air flow outside the body increases in speed and decreases in pressure.

The flow velocity inside is relatively slow and the pressure is higher.

This pressure difference causes the tailwind to flow more smoothly along the sides of the body, reducing air turbulence and energy loss.

This is because when the arm flexion angle increases, the curvature of the compound surface formed by the outer side of the arm and the torso increases.

The radius of curvature decreases from R1 to R2, R2

The reinforcement path of the Bernoulli effect!

When the arm swings back to 140°, the outer side of the upper arm and the side of the trunk form a tapered flow channel (similar to the structure of a Venturi tube). According to the continuity equation, when the airflow passes through a narrow area, the flow velocity is forced to increase (from v to v, v>v). According to the Bernoulli equation, the increase in flow velocity causes the static pressure outside the body, pexternal, to decrease significantly, forming an outer low-pressure area.

The windward surface of the front trunk is shielded by the bent arms to form a relatively gentle airflow attachment surface. The airflow velocity is maintained at a low speed (v≈v), and the static pressure p remains stable, forming an inner high-pressure area.

Plus the lateral pressure gradient drive.

The static pressure difference between the inside and outside is directly converted into a lateral thrust component, and the horizontal projection of this force along the longitudinal axis of the body is the enhanced horizontal component.

The second step.

At the normal arm bending angle of 137.5°, the airflow separates about 5 cm behind the elbow, forming a vortex area.

Drag coefficient Cd≈0.85.

After increasing to 140°, the curvature of the curved surface smoothly transitions, extending the airflow attachment length to 12 cm behind the elbow.

The separation point was moved back 7 cm.

The eddy current area is reduced by 40%.

The drag coefficient drops to Cd≈0.68.

Maybe someone asked...

So what is the use of reducing the drag coefficient?

This is running, not skating.

In fact.

According to the theory of physics, running is like skating.

As long as you are on earth.

Then it is a question of the drag coefficient.

Not the rest of the problem.

The mechanical significance of reduced resistance is that the reduced pressure resistance is equivalent to releasing additional horizontal force for propulsion.

Increase the net propulsion force.

Calculated based on a wind speed of 2m/s and a frontal area of the body of 0.4㎡.

That's it.

In this way, you can deduce that, assuming the tailwind force is F, the angle between it and the longitudinal axis of the body is α, α=90°-θ, where θ is the angle of the bent arm.

When θ increases from 137.5° to 140°:
It seems that the horizontal force coefficient decreases, but in fact the F value increases sharply due to the reconstruction of the airflow.

The wind speed plus the body acceleration increases the relative wind speed from v_wind to v_wind+v_body, F∝v.

The combined effect results in a net increase of 15-20% in F.

Thus.

You just need to do a good job of dynamic angle of attack matching mechanism.

Then you can proceed...perfectly.

That is - when the crank angle increases by 140°.

The angle between the horizontal axis of the shoulder and the downwind direction decreases from β=42.5° to β=40°, forming the optimal angle of attack on the front side of the body.

Su Shen's experiment shows that under ideal conditions, the thrust coefficient C_T reaches a peak value of 40 when β=0.92°.

Thrust per unit area at this time.

19% higher than conventional angles.

This is the third step.

It can also come out more logically.

third step.

boom.

The superposition effect of inertia force!

The angular velocity ω of the swing arm increases from ω=12rad/s to ω=13.2rad/s.

The linear velocity v_t=ω·r at the end of the arm increases from 4.8m/s to 5.28m/s, generating an inertial force.

It forms a vector superposition with the horizontal component of the wind, so that the total propulsion force ftotal=fx+fi, an increase of more than 30%.

If there is a device, it can be discovered.

This moment.

Electromyography testing showed that the triceps discharge intensity increased by 25% at the same time.

In other words, the utilization rate of the downwind thrust at this angle.

Much higher.

Horizontal force increment (N).

Higher too.

Vertical force balance margin (N).

Also stronger.

That’s the significance of this adjustment.

The three-dimensional mechanical nature of thrust enhancement.

In other words, the seemingly simple adjustment of the crank angle is not a simple increase in the angle, but through——

Fluid control: Utilize surface morphology reconstruction to maximize the Bernoulli effect of “low-pressure drainage-high-pressure propulsion”.

Vector optimization: Through the trigonometric function characteristics of the angle θ, the potential of the horizontal force component is released while controlling the lift.

Biological synergy: The inertial force of the swing arm and the horizontal component of the wind form a mechanical coupling, realizing the nonlinear amplification of "environmental force-human force".

and many more.

The core of this technological breakthrough is to transform "passive drag control" in aerodynamics into "active thrust generation".

Through the dynamic matching of multiple physical fields, the utilization efficiency of the horizontal component of the downwind force has exceeded the traditional theoretical limits.

Since we have broken through the limits.

what else.

Why can't it be faster.

Can't be stronger.

It can't be more fierce.

The moment of going out.

The outcome has already been determined.

Three steps in a row.

Three golden steps.

crush.

Everyone.

No matter you are gifted.