⭐️ How F1 Teams Find the Optimized Slip Angle

F1 teams use a combination of tools and methods to find the best slip angle for their tires:

1. Simulations:
• Teams use advanced simulations, including Computational Fluid Dynamics (CFD) and tire modeling, to predict the behavior of tires at various slip angles under different loads, speeds, and temperatures.
2. Telemetry Data:
• During practice sessions, teams analyze telemetry data from sensors on the car. These sensors measure tire temperatures, forces, and slip angles in real time.
3. Track Testing:
• Teams experiment with suspension setups, camber, and tire pressures to fine-tune the slip angle during testing and practice sessions.
4. Driver Feedback:
• Drivers provide input on how the tires feel at different slip angles, helping engineers balance theoretical data with real-world behavior.

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⭐️ Slip, or deformation of the tire, is not the same as “sliding”. It’s a controlled phenomenon that occurs because of how tires interact with the road. In engineering terms, tires rely on slip to generate lateral (side-to-side) and longitudinal (front-to-back) forces due to their elastic properties.

When a tire slips slightly, its rubber deforms. This deformation increases the contact patch’s ability to generate friction forces, which are essential for grip. In F1, a small, controlled slip at the optimal angle enables the tire to produce maximum lateral force during cornering or maximum longitudinal force during braking and acceleration.

If there’s too much slip, the tire slides uncontrollably, losing grip and causing a loss of performance. If there’s no slip, the tire doesn’t deform enough to produce the necessary forces.

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⭐️ The Engineering Behind Benefiting from Slip

1. Elastic Deformation of Tires:
• F1 tires are made from specialized rubber compounds designed to deform elastically under load. This deformation creates shear forces within the tire’s contact patch, which generate grip.
• The optimal slip angle ensures that this deformation is maximized without exceeding the tire’s limit, where it would begin to slide.

2. Force Generation at Optimal Slip Angles:
• Tires generate lateral force (for cornering) and longitudinal force (for braking/acceleration) up to a certain point as slip angle increases. This relationship is shown in a lateral force-slip angle curve:
• At small slip angles, forces increase linearly.
• At the optimal slip angle, forces peak.
• Beyond this point, forces drop as the tire starts to lose grip and slide.

3. Controlled Sliding in Contact Patch:
• The tire’s contact patch doesn’t move uniformly. The leading edge of the patch grips the road, while the trailing edge begins to slide slightly. This creates a dynamic equilibrium where the tire generates maximum grip at the optimal slip angle.

4. Interaction with Suspension and Aero:
• F1 engineers tune the suspension geometry (like camber and toe angles) to align with the tire’s slip characteristics. The aerodynamics of the car also add vertical load (downforce), which increases the frictional forces generated by the tire at the optimal slip angle.

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⭐️ Why Does This Help F1 Teams?

1. Maximum Grip:
• By operating at the optimal slip angle, the tire generates the highest possible grip. This means the car can corner faster, accelerate harder, and brake later.

2. Efficiency in Performance:
• The slip angle ensures that the tire’s energy is used efficiently. Instead of sliding uncontrollably (wasting energy), the tire works within its elastic range to deliver controlled forces.

3. Better Use of Downforce:
• The forces generated by the tire at optimal slip complement the car’s aerodynamics. Downforce increases the grip potential, and the optimized slip angle ensures that the tire takes full advantage of it.

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⭐️ Why It’s Not “Losing Time”

Uncontrolled sliding is indeed a loss of time, as it means the tire has exceeded its grip limit. However, controlled slip is where the tire performs at its best. Think of it like this:
• No slip = not enough deformation = not enough grip = slower cornering.
• Controlled slip = maximum deformation = maximum grip = faster lap times.
• Excessive slip (sliding) = loss of control = slower lap times.

F1 engineering focuses on keeping the tire within that sweet spot of optimal slip to achieve maximum performance.

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⭐️ In summary, we understand that the outer tire, with the angle known as the slip angle, travels a shorter radius compared to the normal state (without slip angle). This allows the driver to extract maximum grip from the tire, and in return, it generates the highest possible friction, lateral force, and heat. As a result, the tire wear is higher than in the normal state. The tire temperature rises above the normal level, but in exchange, grip and traction are enhanced. This angle must be found appropriately because exceeding it can lead to excessive sliding and the car becoming uncontrollable.

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✈️ Explained !

💎 Tonight, I want to continue with what we started last night and move forward a bit to cover a simple and easy to understand topic called the Ackerman Steering Angle. It’s an interesting concept, and I’ll explain it in a way that’s clear and straightforward! ✔️

🟡 At first, you might wonder: if we have a slip angle, the inner and outer wheel angles in a turn won’t be the same. As a result, the incoming airflow won’t be symmetrical either. So, does this negatively affect downforce production and airflow control?

💗Answer : Yes, the incoming airflow definitely won’t be symmetrical, and it does have a negative impact on the car’s aerodynamic efficiency. However, this negative effect is quite small and can be ignored. You might ask, “Why ignore it when even milliseconds matter to us?” The answer is that with a slip angle, we can extract more grip and traction from the tires. The benefit of this extra grip is so significant that it outweighs the relatively minor negative aerodynamic impact.

🟡 We mentioned that when slip angle is applied, the two wheels don’t stay parallel while turning. But what is the name of this system?

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🟢Answer : The name of this system is the Ackerman Steering Angle. In fact, we can imagine three different scenarios for how the wheels align relative to each other while turning. Let’s take a closer look at these three cases together :

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☑ 1. Parallel steering angle

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☑️ In this scenario, the two wheels remain parallel to each other while turning. Honestly, I don’t have complete information about this, but I don’t think it has much practical use in today’s era of advanced engineering. It doesn’t really offer any significant advantages or disadvantages. Overall, it’s not very interesting or useful.

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✔️2. Positive Ackerman

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🩷 This type, called the Positive Ackerman Steering Angle, is mostly used in regular, everyday cars that we see around. But why and how is it used?

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✔️The Positive Ackerman Steering Angle is used in regular cars mainly because these vehicles prioritize low tire wear over extreme grip. In city cars, tire lifespan is more important, and we don’t need the kind of high traction required in performance cars. Additionally, this system improves steering at low speeds and in tight corners, making the car easier and smoother to drive.

With this setup, friction is reduced, and grip decreases slightly, but the chance of the tires slipping is very low, which is perfect for everyday driving.

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👍3. Anti-ackerman steering angle ( reverse ackerman ) ( negative ackerman )

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