AERODYNAMICS PRINCIPLE

The aerodynamicist two main priorities are to maximise downforce and minimize aerodynamic drag. Downforce helps to improve cornering force allowing the car to corner faster. Aerodynamics drag is the force that opposes the motion of the car through the air. Both downforce and drag are dependent on speed: as the speed of the car increases, both downforce and drag increases disproportionately (if the car's speed doubles, the aerodynamics forces increases fourfold). To give an idea of the level of drag actiong on the car, at maximum speed the cars total drag with a high-downforce set-up will produce over 1G of deceleration the instant the driver lofts off the throttle, before he even touched the brakes. As an illustration of the actual forces involved in F1 aerodynamics, when the car is travelling at maximum speed the peak downforce produced by the cars aerodynamics device (front and rear wings, floor diffuser) is typical over five times the cars weight, or close to 4,000kg in typically in 2021. This downforce allowed the car to generate a lacornering force of over 4G (tour times its own weiaht) crate a latera. The primary tools used for aerodynamic developmens the wind tunnel and Computational Fluid Dynamics (CED analysis software -these two tools Complement each ther and both have useful roles to play. The science of aerodynamics is a complicated subject in its own right, and arguably more advances have been made in aerodynamics over the years than in any other area of F1 car design. The subject is too vast to cover in depth  in this book, and detailed analysis requires a reasonable understanding of complex mathematical calculations, but n essence the aim of the F1 aerodynamicists is to desian a car that provides optimum (not necessarily maximum) downforce in order to improve grip, cornering speeds and acceleration (which can be improved because downfo increase traction), while minimising drag, which can reduce speed in a straight line. Additionally, the aim is to achieve aerodynamic stability, so that levels of downforce do not change dramatically with the pitching, yawing and rolling motions of the car. If the car suffers from aerodynamic instability, handling will be significantly affected, as will the driver's confidence in the car and his ability to push t the limit to achieve maximum performance.

The aerodynamic setup of an F1 car must be tailored to each circuit, working alongside the mechanical setup. The key focus is on aerodynamic efficiency, balancing downforce and drag. Different tracks require distinct setups: for instance, Monza demands low downforce, while Monaco requires high downforce. Tracks like Spa and Montréal need a medium-downforce setup. Since both downforce and drag increase with speed, and most tracks feature a mix of low- and high-speed sections, achieving the optimum aerodynamic performance is crucial for success. The aerodynamic setup for each track requires a **compromise**. Ideally, high downforce helps with **slow-speed corners** for better grip, while low downforce (and less drag) is better for **high-speed corners and straights**. However, aside from the use of the **Drag Reduction System (DRS)**, the car's aerodynamic setup is fixed for the race, so finding the right balance is crucial. This balance can also be influenced by factors like **weather**—in a **wet race**, where mechanical grip is reduced, higher downforce is often needed to regain grip, leading to a setup that favors more downforce on the front and rear wings.

Principle of Wings on Racing Cars

The front and rear wings of a racing car work like an aircraft wing but are mounted upside-down to generate downforce rather than lift. The wing’s aerofoil shape causes air passing underneath to accelerate, lowering pressure and creating a force that pushes the car down for better traction. However, if the airflow separates from the wing's surface, the car experiences drag and can even "stall," losing both downforce and drag, which is dangerous for handling.

To prevent this, wings are often split into two elements with slots to speed up the airflow under the wing, allowing for steeper angles and more downforce without stalling. However, a steeper angle increases the risk of flow separation.

In recent years, F1 cars have been optimized for aerodynamic efficiency in "clean air" (when not following another car). However, in "dirty air" (when following another car closely), cars lose downforce, especially at the front, making overtaking harder. This happens because the car in front creates a wake of low pressure, which affects the following car’s aerodynamics. While this reduces the following car's drag, giving it a "tow," it also significantly reduces downforce, making it difficult to pass.

To improve overtaking, the FIA introduced adjustable front wings in 2009, allowing drivers to modify wing angles to regain downforce when following another car, but this was not very successful and was discontinued. Regulation changes in 2014 and 2022 aimed to reduce the aerodynamic wake effect and increase downforce retention for trailing cars. The 2022 regulations allow cars to retain up to 82% of their downforce when following another car, improving overtaking chances and maintaining competitive racing.

These regulations challenge teams to innovate within restricted aerodynamic rules, pushing engineers to find new ways to optimize performance while reducing the disruptive effects of wake turbulence.

The aerodynamic components of a racing car work together as a system. The front wing affects the performance of the floor, and the rear wing relies on the airflow from the floor to work efficiently. The floor is shaped to manage the wake from the front wing, and the diffuser and rear wing are designed to benefit from the upwash generated by the floor, enhancing their effectiveness. 

With the return of ground-effect aerodynamics in 2022, optimizing how these components interact has become even more critical. Some components, like the diffuser, are more efficient at generating downforce compared to the front and rear wings. While wings increase both downforce and drag, the diffuser uses the venturi effect to produce downforce with minimal drag, making it a more efficient solution.

Front Wing

The front wing plays a key role as it influences the airflow to every other part of the car. While it typically generates about a third of the car’s total downforce, its primary purpose is to ensure overall aerodynamic efficiency, rather than just maximizing downforce.

Throughout a grand prix season, the front wing undergoes constant development using CFD (Computational Fluid Dynamics) and wind-tunnel simulations. It often evolves with small, detailed changes made for almost every race. However, the scope for these changes has become more limited with the 2022 regulation updates.

In recent years, the front wing design has become increasingly complex, incorporating multiple wing elements, turning vanes, and intricate endplate designs. These features are designed to optimize airflow at the front of the car, significantly influencing overall aerodynamic efficiency. The front wing's role is to manage airflow across the car, directing it to the floor, diffuser, and rear wing.

However, to reduce the loss of downforce when following another car in turbulent air, the 2022 regulations simplified the front wing. The new design limits it to a maximum of four elements with simplified endplates, reducing complexity and improving racing dynamics.

The front wing on an F1 car includes an adjustment mechanism :

to fine-tune the downforce it generates. Mechanics can manually adjust the wing's angle during pit stops, specifically adjusting the wing flaps (usually the rear elements) to modify the car's balance. For instance, increasing the flap angle boosts front downforce to reduce understeer, while reducing the flap angle decreases downforce to mitigate oversteer, allowing the car's setup to align with the driver’s preferences or compensate for changes in the rear-wing configuration.

The front wing operates near the ground, creating a ground-effect, which complicates the airflow around it. Additionally, the close proximity of the front wheels affects how air moves around the front-wing components. The design of the front wing influences airflow across the car, impacting the performance of the floor, diffuser, and rear wing. Previously, complex vortices (like the Y-250 vortices) formed at the inner edges of the front-wing elements and were crucial for managing airflow around the car. These vortices were guided by both the front wing and the turning vanes (barge boards), helping control the airflow to the rear of the car, around the wheels, and across the floor.

However, the 2022 regulations simplified the front wing design. The vortices were effectively eliminated because all front-wing elements now extend directly to the nose, and the endplates have been redesigned, including simplified diveplanes to better control airflow to the rear and improve overall aerodynamic performance.

The performance of the front wing is significantly influenced by its proximity to the track. While the static height of the front wing is regulated, its distance from the ground can greatly impact the downforce it generates, affecting the car's overall balance. Maintaining a consistent distance between the wing and the track is crucial for stable handling. This stability, often referred to as a stable aerodynamic platform, relies on both the mechanical setup of the car and the design of its aerodynamic components. A car with a stable platform is easier to set up and results in predictable handling, optimizing performance.

The flexibility of the front wing is another important factor. By using carbon-fiber materials, the wing can be designed to be stiff in certain directions and flexible in others. This flexibility can enhance the wing's effectiveness. This principle was first applied in the early 1990s, particularly on the Williams FW14B in 1992. The car used horizontal footplate extensions under the front suspension to help manipulate the outer edges of the wing, improving its aerodynamic performance under load.

Under aerodynamic load, front wings can flex closer to the track, increasing downforce. As the wing assembly twists rearwards under load, the angle of attack is reduced, which lowers drag—similar to the DRS system but less pronounced. This effect is particularly useful on high-speed sections of a track, like straights, where reducing drag can boost straight-line speed. Using specialized software, teams can fine-tune the carbon-fiber lay-up to achieve the right balance of strength, bending, and torsional stiffness to optimize the wing's performance.

This concept of flexible wings has been widely used in F1 for over 30 years. The regulations allow a certain degree of flexing under load because it is nearly impossible to design a wing that doesn’t bend under the immense aerodynamic forces. To ensure fairness, the FIA has implemented static load tests to regulate how much the wing can flex, ensuring that deflection stays within prescribed limits.

However, in recent years, flexible front wings have sparked controversy. Some teams have found ways to use flexibility to gain a competitive edge, prompting stricter scrutiny and enforcement from the FIA to maintain a level playing field. This is done by innovative ways of maximizing the clever carbon-ply lay-up to control the flexing properties of the wing components under various loads.

Front Wing Construction

The front-wing construction in F1 has undergone significant simplification since 2022, in line with revised regulations. The design now consists of three main carbon-fiber components:

1. Wing Elements: A maximum of four elements, directly connected to the nose at the inner ends and to the endplates at the outer ends. The rearmost elements may be adjustable to fine-tune the aerodynamic load.

2. Endplates: Vertical plates at each end of the wing, which help control airflow by preventing air from spilling over the sides. They also direct turbulent air outwards, away from the car’s floor and diffuser. The 2022 regulations require simpler one-piece endplates compared to the previous designs.

3. Diveplanes: These are sloped surfaces attached to the outer edges of the endplates, designed to enhance airflow control.

The 2022 regulations introduced a more swept-back wing profile with integrated endplates, and the wing sits higher above the ground than in previous seasons. This aims to reduce the wing's downforce contribution and lower the car’s pitch sensitivity (how downforce changes with ride height). Additionally, endplates must now be made with a specific carbon lay-up to prevent them from shattering into dangerous splinters upon damage.

NOSE

The nose of a Formula 1 car serves as a removable extension of the chassis, comprising the front crash structure and the mounting for the front wing. Typically made from a one-piece carbon-fiber molding, it houses the FIA-mandated cameras, with one on each side at prescribed positions.

Nose Design Concepts

Over the past 30 years, two primary nose designs have dominated:

- High Nose: The nose runs almost horizontally from the chassis, with the front wing mounted significantly lower than the nose’s lower edge.

- Low Nose: The nose slopes down towards the front, bringing it closer to the wing assembly.

Nose Regulation Changes

In recent years, regulations have evolved for safety reasons, primarily to reduce the risk of a car being launched into the air during collisions.

1. 2011 Regulations:  High Nose and Low Nose designs dominated, with high noses generally optimizing airflow but often resulting in less attractive stepped profiles.

2. 2012 Regulation: The FIA lowered the permitted nose height to ensure it was below the cockpit sides. Teams had to drop the nose section by 75mm, creating a noticeable step in the nose design. Despite the step, teams kept the front chassis as high as allowed to optimize airflow under the car.

3. 2013 Vanity Panel: To address aesthetic concerns over the stepped noses, a "vanity panel" was allowed to smooth the appearance.

4. 2014: Further changes reduced the maximum height of the front chassis bulkhead and the nose tip, refining nose design for both safety and aerodynamic purposes.

2022 Regulations:

- Extended Nose: Introduced a longer nose as a response to safety investigations following Anthoine Hubert's tragic accident in 2019. The extended nose accommodates a more robust front impact structure.

- The new design requires the nose assembly to pass FIA crash tests and homologation.

- The nose is attached to the chassis with quick-release fittings for easier replacement during pit stops.

Overall, these changes aimed to enhance safety and maintain aerodynamic efficiency while addressing design aesthetics and functionality.

Pit Stops and S-Duct Overview

Pit Stops for Front Wing Damage:

- In the event of damage, which frequently affects the vulnerable front wing, the nose assembly can be quickly replaced during a pit stop.

- The electrical connections for cameras and front tire temperature sensors are designed for easy disconnection at the nose joint, facilitating rapid repairs and adjustments.

S-Duct:

- Introduction: The S-duct emerged in F1 cars about 10 years ago and was integrated into the nose assembly.

- Function: It helps manage airflow around the car, playing a minor but beneficial role in aerodynamic performance.

- Design: Named for its 'S-shaped' routing of air, the S-duct was widely adopted by teams by 2021 for its aerodynamic advantages.

S-Duct and Chassis Overview

S-Duct:

- Purpose: The S-duct is designed to manage airflow around the front of the nose. It channels turbulent air away from sensitive areas like the turning vanes and floor, redirecting it to the top surface of the nose where its impact is less disruptive.

- Operation: Air enters through one or more vents at the front of the nose, travels through the S-duct, and exits through an outlet on the top surface. This system helps mitigate aerodynamic disturbances.

- Regulation Change: As of the 2022 season, new regulations have prohibited the use of S-ducts, so they are no longer featured on current F1 cars.

Chassis:

- Primary Role: The chassis serves as the car’s main structural component and driver’s survival cell.

- Aerodynamic Design: The chassis features a complex V-shaped cross-section when viewed from the front. This design optimizes airflow around the sides of the chassis, enhancing the performance of the front and rear wings, floor, and diffuser.

Turning Vanes (Barge Boards)

- Description: Turning vanes, also known as barge boards, are vertical, often curved plates mounted on either side of the chassis, between the front wheels and sidepod air intakes. They help manage airflow around the car.

- History: First introduced in the early 1990s, they became increasingly complex through the 1990s and early 2000s, with various configurations including elements on sidepods and under the nose.

Functions:

- Airflow Management: Their primary role is to control and direct the turbulent wake created by the front wheels. This helps in improving the airflow to critical areas like the sidepods, floor, and diffuser.

- Secondary Functions: They also aid in scavenging air from the front wing and under-chassis area, redirecting it towards the sidepods and floor.

Regulatory Changes:

- 2009 Regulations**: Simplified the design of turning vanes and restricted their placement.

- Post-2022 Regulations**: Heavily regulate aerodynamic devices, effectively banning turning vanes on the chassis sides. However, turning vanes are still allowed on the front edges of the upswept floor extensions to aid in managing airflow to the underbody tunnels. Small strakes can also be used inside the floor extension’s mouth to assist with airflow management.

Current Usage:

- Design Evolution: In recent years, turning vanes have become more integrated into the car’s aerodynamic package, with refined designs fitting within the new regulatory framework.

Sidepods

Function and Components:

- Cooling: Sidepods house critical cooling systems including:

  - Engine coolant radiators

  - Engine and gearbox oil coolers

  - Hydraulic fluid cooler

  - Turbocharger intercooler

  - ERS and MGU-K coolers

- Electronics and Safety: They also contain electronic control units (ECUs) and side-impact crash structures.

Design and Construction:

- Ducting: Air is channeled through ducting to coolers and ECUs. The ducting, along with brackets and mounting trays, supports the weight of these components.

- Attachment: Sidepods are typically bonded or bolted to the chassis. The design team may adjust bodywork components to meet specific requirements.

Aerodynamic Impact:

- Shape and Contours: Sidepods are sculpted to control airflow around the rear of the car, the wheels, and the diffuser. They contribute to a car’s aerodynamic efficiency by:

  - Narrow Rear End: Featuring a pronounced inward curve when viewed from above, creating a 'coke bottle' shape. This design minimizes drag and optimizes airflow between the rear wheels, enhancing the diffuser's performance and airflow to the rear wing.

- Regulations: Since 2022, regulations dictate the shape and volume constraints of sidepods, limiting design flexibility but ensuring compliance with safety and performance standards.

Floor

Role and Efficiency:

- Aerodynamic Importance: The floor is a critical component for generating downforce efficiently, offering significant downforce with minimal drag. It has become increasingly complex with features like slots, holes, and vanes designed to fine-tune airflow and enhance downforce.

Floor Configuration (Pre-2022):

- Stepped Design: Up until the end of the 2021 season, F1 car floors were designed with a stepped profile due to FIA regulations introduced in 1995 to control downforce levels.

  - Reference Plane and Step Plane:

    - Reference Plane: This is the lowest surface of the car, closest to the track. Without the FIA regulation 'plank' fitted, the floor’s lowest surface is on this plane.

    - Step Plane: This is 50mm above the reference plane. 

    - Regulation Details: The regulations required that the floor between the front and rear-wheel centerlines be on one of these two planes. The central section, lying on the reference plane, was a minimum of 300mm and a maximum of 500mm wide, and symmetrical about the car's centerline. This resulted in a stepped floor design with a low central section and higher outer edges.

Post-2021 Changes:

- Updated Regulations: New regulations from 2022 significantly altered the floor design. These changes were made to further refine aerodynamic performance and reduce the effectiveness of ground-effect aerodynamics, which had become a major factor in car performance.

Floor

Design Evolution:

Pre-2021:

- Stepped Floor: Up until 2021, the F1 car floor featured a stepped design due to FIA regulations introduced in 1995 aimed at controlling downforce. The floor had a low central section (on the reference plane) and higher outer sections (on the step plane), creating a stepped profile.

2021 Regulations:

- Reduced Downforce: The 2021 regulations introduced changes to further reduce downforce. These included:

  - Floor Shape: A triangular section was cut off from each rear outer edge of the floor, altering its shape from rectangular to one with diagonal tapers inward toward the centerline of the car.

  - Solid Floor Requirement: Previous features such as slots and holes in the floor edges were banned, requiring a solid floor for the first time in many years.

Post-2021 Changes:

- 'Tea Tray' Section: The forward section of the floor, known as the 'tea tray,' extends from the sidepod area under the chassis. This area continues to be a focus for aerodynamic development, as flexible floors theoretically offered an aerodynamic advantage, though such flexibility has been regulated to ensure fair competition and safety. 

Floor Configuration from 2022

Introduction of Ground-Effect Tunnels:

- Revised Regulations: The 2022 regulations marked a significant shift by eliminating the stepped floor design and reintroducing underbody tunnels, a feature reminiscent of the 'ground-effect' era from the 1980s.

- Purpose: The main goal of these tunnels is to enhance downforce stability when following another car closely. Unlike wings, the downforce generated by the underbody is less affected by the aerodynamic wake of the car ahead, providing more consistent performance in traffic.

Design and Function:

- Underbody Tunnels: The floor features two underbody tunnels running along the sides of the car. These tunnels are crucial for generating downforce through ground effect. The size and shape of these tunnels are strictly regulated to ensure compliance and performance balance.

- Diffuser: The rear section of each tunnel forms the diffuser. For 2022, the diffuser's exit is approximately 30% narrower compared to the 2021 design but can be up to 80% deeper. This change aims to optimize airflow and downforce generation.

Edge Wings:

- Longitudinal Edge Wings: Positioned on the outer upper edges of the floor, towards the rear of the sidepods, these wings help manage the airflow around the floor's edges. They play a role in directing the airstream away from the edges, which can help to maintain the efficiency of the underbody tunnels and the overall aerodynamic balance of the car.

Ground-Effect Overview

Ground-effect refers to the aerodynamic phenomenon where an object near the ground experiences increased lift and reduced drag due to the pressure changes and disrupted airflow. Originally observed in aircraft, it was applied to F1 cars in the late 1970s with the introduction of underbody venturi tunnels and skirts. This setup created significant downforce by sealing air around the car's floor, enhancing grip.

The Lotus 78’s discovery of this effect led to the dominant Lotus 79, which won both championships in 1978. Although skirts and venturi tunnels were banned by 1983 for safety reasons, the principle of ground-effect remains integral in F1. Modern F1 cars use floor designs and diffusers to harness ground-effect, making the 2022 return to ground-effect more about optimizing existing principles rather than a complete revival of past methods.

Floor and Venturi Effect in F1 Cars

Floor Design (2022 and Beyond):

- From 2022, F1 cars use underbody tunnels to harness ground-effect, a principle revived from the 1980s. The floor no longer features the stepped design of previous seasons and includes two separate venturi tunnels, one on each side of the car.

- These tunnels work like a venturi tube, where airflow is accelerated through a constriction (throat) and then expanded through the diffuser, creating low pressure and high downforce.

Aerodynamic Function:

- The floor’s shape and the configuration of the venturi tunnels optimize airflow, increasing downforce while minimizing drag. 

- The 'tea tray' or 'bib' at the front of the floor has been greatly reduced in size from 2022, lessening its aerodynamic impact.

Regulations:

- FIA deflection tests ensure the floor’s structural integrity by measuring how it deforms under specified loads at various points.

Practical Impact:

- The revised floor design helps improve stability and downforce, making the car less affected by the aerodynamic wake of competitors. The detailed shaping of the underfloor and diffuser enhances performance by efficiently managing airflow.

These updates illustrate F1’s ongoing evolution in optimizing ground-effect to balance downforce and aerodynamic efficiency.

Floor and Venturi Effect in F1 Cars

Venturi Effect:

- The venturi effect in F1 cars is harnessed through underbody tunnels, which create high downforce by accelerating airflow under the car. This is achieved by managing the airflow both upstream and downstream of the floor.

**Floor Design (2022 and Beyond):**

- Since 2022, cars use two separate venturi tunnels on either side of the floor, replacing the previous stepped design. This setup enhances downforce while reducing drag.

Aerodynamic Integration:

- The floor alone generates minimal downforce. It's the combination of the front wing, diffuser, and rear wing that maximizes its effectiveness. The goal is to channel clean air under the car and accelerate it, often achieved by raising the rear ride height (known as 'rake').

Historical Context:

- In the 1970s and 1980s, ground-effect cars used this principle to great effect, and modern designs continue to leverage it to improve aerodynamic performance and stability.

Modern Floor Design in F1

Current Design and Purpose:

- Skirts are banned in F1, but designers aim to mimic their effect by 'sealing' the lower edges of the floor. This approach improves downforce and reduces sensitivity to ride-height changes.

Vortices and Airflow Management:

- Vortices generated along the floor edges help seal the floor, managing airflow between the front and rear wheels. In 2022, teams like McLaren excelled at creating these vortices, mitigating issues like 'porpoising,' which affects car stability.

Integration and Efficiency:

- Effective floor design involves integrating aerodynamic devices to work in harmony, enhancing interaction between the front wing, floor, diffuser, and rear wing. Teams continually refine their designs to optimize airflow and downforce.

Historical Context:

- Teams discovered in 2010 that better interaction between the front wing and floor improved downforce and efficiency, a principle that remains relevant in today's designs.

F1 Floor and Plank

Plank:

- The FIA mandates a skid block, or "plank," on the car's floor. From 2022, it must run from 430mm behind the front wheel to 600mm ahead of the rear wheel, measuring 250mm wide and initially 10mm thick. By the end of the race, its thickness must not fall below 9mm.

- Typically made from Jabroc, a high-density beech-wood product, the plank ensures a minimum ride height and provides a uniform wear rate and material density.

Wheels and Aerodynamics:

- Wheels and tyres significantly affect drag and aerodynamics. Their rotating and deforming characteristics impact airflow around the car.

- Front wheels influence the design of the front wing, turning vanes, and sidepods, while rear wheels affect the diffuser, rear floor, and rear wing. The interplay between wheels and aerodynamic components is crucial for optimizing performance.

F1 Wheel and Axle Innovations

**Standard Wheels (from 2022):**

- As of 2022, F1 wheels are standardized, with a single manufacturer supplying all teams. This change eliminates aerodynamic advantages from custom wheel designs.

- The new 18-inch wheels replace the previous 13-inch size and are paired with lower-profile tyres. This reduces tyre deformation and aerodynamic turbulence due to stiffer sidewalls.

**Fixed Wheel Covers:**

- In 2009, teams used complex fixed wheel covers, or "spinners," which were later banned. The design aimed to improve aerodynamic efficiency by managing airflow around the wheels.

- From 2022, wheel covers are mandatory again. These are fixed to the wheels and rotate with them, reducing aerodynamic wake and preventing teams from using wheels for aerodynamic advantage.

**Blown Front Axle:**

- Introduced in 2013, the blown front axle involved a hollow axle and wheel nut that directed brake-cooling air to the wheel’s outer edge. This helped manage airflow around the front wheels, cleaning up the wake affecting the rear of the car.

- By 2019, the blown axle was banned, as its use was deemed an aerodynamic device outside the rules.

**Front-Wheel Winglets (2022 Season):**

- Introduced in 2022, front-wheel winglets are aerodynamic devices that extend outwards and downwards from the top edge of each front wheel. Their role is to direct the wake from the front wheels away from the rear of the car, improving airflow consistency and reducing rear aerodynamic turbulence.

Brake Ducts:

- Modern brake ducts fully enclose brake components in a carbon-fibre "cake tin," optimizing airflow over the brakes. This design enhances cooling and improves aerodynamic performance by better managing airflow around the wheels and tyres.

- Brake ducts have evolved with complex shapes and added winglets, enhancing airflow management and cooling. Regulations from 2019 restricted front brake duct designs to prevent aerodynamic gains by limiting their size relative to the wheel rim diameter. By 2022, further regulations were introduced to standardize brake duct shapes and openings, reducing their aerodynamic impact.

Suspension Components:

- Modern F1 suspension components are designed to optimize aerodynamic flow and minimize drag. Carbon shrouds are commonly used, particularly at the rear, to streamline lower suspension components and driveshafts, improving airflow around these areas.

- **Design Focus:** Suspension components are designed to optimize aerodynamic flow and minimize drag. Modern F1 cars use carbon shrouds to streamline rear suspension components and driveshafts, improving airflow and reducing drag. In essence, the diffuser is designer to draw the air from under the floor of the car, and the more air that it can draw, and the faster that air can be made to flow, the lower the pressure created, and hence the higher the downforce.

- **Regulatory Constraints:** Since 2022, regulations have tightened around suspension design, particularly in mounting and component placement, limiting the aerodynamic advantages that can be gained from suspension design. Before 2022, and effective diffuser has been able to produce around 30-40 % of the total downforce on the car, but due to new regulations and the FIA aiming to get more overtake actions this has change dramatically in 2024, having a diffuser become much deeper, and there has been an absence of strakes.

- **Aerodynamic Compromises:** Historically, teams, such as Red Bull Racing in 2010, have compromised suspension stiffness for aerodynamic gains, notably with double diffusers, by positioning the lower rear wishbone higher and further forward to maximize diffuser effectiveness.

Diffuser:

- Function: The diffuser accelerates low-pressure air from under the car, allowing it to decelerate and return to ambient pressure, thus generating downforce. It curves upwards to increase the distance between the track and the car’s floor, enhancing airflow management.

- Design: A larger diffuser can draw more air from under the car, increasing downforce. The key is to maximize the diffuser’s height and width at the rear edge to improve airflow and pressure drop, which enhances overall downforce.

**Engine Cover and Upper Bodywork in F1 Cars**

The **engine cover** and upper bodywork of a Formula 1 car play a critical role in both aerodynamics and accessibility. Here's a breakdown of their key aspects:

### **Design and Function:**

- **Size and Coverage:** The engine cover is the largest piece of bodywork, usually covering the airbox, engine, gearbox, and sidepods. Its shape is crucial for aerodynamic performance, helping guide airflow efficiently around the car.

- **Modular Structure:** The upper bodywork typically consists of separate, removable panels to allow quick access to critical components like the engine, gearbox, and suspension. These panels are designed for easy removal during races and maintenance.

### **Aerodynamics:**

- **Tight Fit:** The fit of these panels is essential to maintain aerodynamic efficiency. Even small gaps or misalignments can disrupt airflow and increase drag, so teams aim for highly precise shut lines between the panels.

- **Taping for Performance:** To minimize any aerodynamic disruptions caused by panel gaps, teams often tape over these joints during races. This not only helps with drag reduction but also improves overall performance.

### **Weight and Durability:**

- **Lightweight Construction:** Due to its size and height on the car, the engine cover can affect the car's center of gravity. To minimize this impact, it's constructed to be as light as possible, often using very lightweight carbon-composite materials.

- **Durability vs. Performance:** These covers are not built for long-term durability and are often replaced after each race. This is because the lightweight materials wear out quickly, but also because teams constantly update parts as part of performance upgrades.

### **Fastening and Maintenance:**

- **Fasteners:** The bodywork panels are typically secured with spring-loaded, threaded fasteners. These fasteners are designed to withstand severe vibrations and are quick to operate, making them practical for fast repairs or adjustments during races.

### **Conclusion:**

The engine cover and upper bodywork in F1 cars are crucial for both performance and maintenance. Their design focuses on minimizing weight, ensuring aerodynamic efficiency, and allowing easy access to the car's components, all while being subject to frequent updates as part of the car's development.

Shark Fin in Formula 1 Cars:

The **shark fin** was an aerodynamic innovation introduced by **Red Bull Racing** on the **RB4** at the start of the 2008 season. Here's an overview of the design and its influence:

### **Design Purpose:**

- The **shark fin** significantly increases the surface area of the engine cover, extending it into a vertical, fin-like structure. Its main role is to manage airflow over the rear wing, especially under cornering conditions, to provide improved stability.

- It helps **divert turbulent air** away from the rear wing during yaw (when the car turns) or in **crosswinds**. This aids in **rear-end stability**, particularly under braking or during lateral movement caused by wind.

### **Key Aerodynamic Effects:**

- **Yaw Sensitivity:** The shark fin affects how the car behaves when the direction of the airflow differs from the car's direction, a situation known as yaw. This is important in low-speed corners or windy conditions, where the car has to turn more sharply. The shark fin improves stability in such conditions by **"weathervaning"** the car, helping it turn more predictably.

- **Center of Pressure (C of P):** By influencing the car's aerodynamics, the shark fin helps to move the car’s **center of pressure** closer to the center of the vehicle, balancing the car's handling and reducing yaw sensitivity.

### **Evolution and Regulation Changes:**

- When **F-ducts** were introduced (an airflow device designed to stall the rear wing for better straight-line speed), the shark fin was extended to connect to the rear wing to facilitate its operation. However, the **2011 regulation changes** that banned F-ducts also prohibited full-length shark fins, leading to their disappearance.

- The **2017 season** saw the shark fin’s brief return, thanks to new regulations that lowered the rear wing, increasing the wing’s exposure to turbulent airflow. Teams used shark fins to **clean up the airflow** before it passed over the rear wing, improving aerodynamic efficiency.

- Despite its resurgence, shark fins were again **banned** by regulation updates in **2018**, marking the end of their widespread use.

### **Conclusion:**

The shark fin was a clever aerodynamic solution designed to stabilize the car during yaw and cornering, particularly in challenging crosswind conditions. Although its use was limited by regulation changes, it highlights the continuous development of innovative aerodynamics in F1 to improve car performance and handling under varying conditions.

### **Airbox in Formula 1:**

The **airbox** on a Formula 1 car primarily serves the following functions:

1. **Engine Air Supply:** It provides air to the **internal combustion engine** for combustion, which is essential for generating power.

2. **Cooling Air Supply:** Since the introduction of **hybrid power units**, the airbox also supplies cooling air to various systems within the car's bodywork, such as **ERS (Energy Recovery Systems)** and other critical electronics and components.

### **Airbox Design & Aerodynamics:**

- The airbox has a **significant aerodynamic impact** on the car. The airflow around it must be optimized to avoid turbulence, especially since the introduction of the **Halo** device in 2018, which adds complexity to how air moves around the airbox.

- Many teams, to improve cooling, have **increased the size** of the airbox since the hybrid era. This larger air intake helps channel air to various coolers and radiators inside the car, especially for managing the extra heat produced by hybrid components.

- A common configuration has been the use of **three separate air tracts**, forming an inverted "V" shape, which helps direct airflow to different systems. Not all teams use this configuration; for example, **Alfa Romeo** and **Alpine** have adopted different designs as of the **2021 season**.

**Rear Wing:**

The **rear wing** is one of the most important aerodynamic components on a Formula 1 car, often producing up to **a third of the car’s total downforce**. 

Function:

- A **high-downforce rear wing**, like the one used in Monaco, can generate over a **tonne of downforce** at high speeds. This helps keep the car stable, especially in corners, by pushing the car onto the track surface.

- The rear wing’s function is based on **airfoil principles**—it creates a pressure difference between the top and bottom surfaces of the wing, resulting in downforce that pushes the car toward the track.

Evolution and Design:

- In the 1990s, teams used **multi-element rear wings** on high-downforce tracks to generate even more downforce. However, to curb excessive downforce, the FIA introduced regulations over the years, restricting teams to just **two elements** since 2004.

- The **endplates** of the rear wing are designed to optimize airflow over the wing elements and minimize the formation of **vortices**, which cause drag and reduce efficiency.

- From **2010 to 2016**, regulations required relatively **narrow rear wings** with tall endplates, which kept the rear wing’s top element close to the height of the airbox.

Overall, both the **airbox** and the **rear wing** play crucial roles in an F1 car’s **aerodynamic performance**, impacting **engine cooling** and **downforce generation**. These components are carefully designed to ensure they contribute positively to the car's **balance, stability, and overall efficiency** on the track.

### **Rear Wing Evolution in Formula 1 (2010-2017):**

1. **Pre-2010 Rear Wing:**

   - The **rear wing** of Formula 1 cars up until 2010 was relatively simple in comparison to later designs. It consisted of two primary components:

     - The **upper wing element** (often referred to as the "mainplane").

     - The **lower structural beam wing**, mounted on the endplates. This **beam wing** connected to the gearbox or the rear crash structure.

   - The rear wing was largely **independent**, with some teams using a **single central pylon** or **twin pylons** to mount it close to the car’s centerline.

2. **F-Duct Introduction in 2010:**

   - The **F-duct system** made rear wing design more complex. This system allowed drivers to stall the rear wing by redirecting airflow, reducing drag, and increasing top speed on straights. 

   - To incorporate the F-duct, teams integrated the rear wing more deeply into the overall design of the car, particularly affecting the rear-end aerodynamics.

3. **Post-2010 and F-Duct Ban:**

   - Following the ban on **F-ducts** from the 2011 season, rear wings could no longer have such complex airflow systems. The wings returned to a more simplified form.

   - Another significant change came in **2014**, with the **ban on the beam wing**. This element had previously contributed significantly to the downforce generated at the rear of the car. The removal of the beam wing reduced overall rear downforce, impacting how teams designed rear wings and diffusers to make up for the loss.

4. **2017 Regulation Changes:**

   - In 2017, regulations required **lower and wider rear wings**, marking a shift from the previous narrower designs. This wider configuration helped increase downforce but also influenced drag and airflow around the rear of the car.

   - These changes also contributed to the return of the **shark fin**, which reappeared across the grid to help control airflow around the rear wing and improve stability.

5. **Diffuser Integration:**

   - The **rear wing endplates** were previously designed to extend down to the level of the rear floor, which allowed teams to integrate the rear wing more effectively with the diffuser, increasing its aerodynamic efficiency.

   - The **endplates** themselves acted as additional vertical strakes for the diffuser, improving airflow and boosting downforce.

These changes reflect how Formula 1 regulations constantly shape the development of rear wings, leading teams to innovate in other areas such as diffusers, airboxes, and overall bodywork to balance performance while adhering to evolving rules.

The 2022 regulations brought significant changes to the **rear wing** design in Formula 1, aiming to improve overtaking opportunities by reducing the disruptive aerodynamic wake generated by the cars. This was particularly important because the wake created by the rear wing can cause turbulence, reducing the downforce of the car following behind, making it difficult to overtake.

Key changes in the **2022 rear wing design** included:

- **Larger dimensions**: The rear wing became **wider and deeper**, with a **wider chord** to manage airflow more effectively.

- **Increased height**: The wing was mounted slightly higher off the ground.

- **Beam wing reintroduction**: The **beam wing**, a lower structural element, returned and contributed to both aerodynamic efficiency and structural support.

- **Simpler endplates**: In contrast to the complex, straked, and slotted endplates of earlier seasons, the 2022 design mandated **plain, simpler endplates** without holes or slots to reduce the formation of aerodynamic vortices.

The purpose of these changes was to push the wake higher and further behind the car, reducing its impact on following vehicles and allowing more **clean air** to flow behind. This helps improve the ability of the car behind to maintain downforce and engage in close racing, thereby enhancing the chances of overtaking. The **DRS (Drag Reduction System)** was also enhanced by increasing the size of the DRS gap between the wing elements, making it more effective during overtakes.

Overall, the 2022 regulations marked a significant shift in the aerodynamic philosophy of Formula 1, moving towards designs that facilitate closer racing and improve competition.

In the 2022 Formula 1 season, several updates were made to the design and safety features of the **rear wing**, reflecting the shift towards improved racing dynamics and safety.

Design Changes:

1. Endplates: 

   - The endplates must now blend smoothly into the wing elements at their upper edges, similar to the front wing design.

   - These endplates are simpler and free from aerodynamic slots or holes, a departure from the highly complex designs used in previous years. The simplification helps to reduce turbulence and unwanted vortices, aiming to create cleaner airflow and reduce drag.

2. Wing Elements: 

   - The rear wing continues to feature wide, deep elements that allow for higher airflow and create significant downforce. This shape also pushes airflow higher and farther back, minimizing the impact on cars following closely behind.

3. Central Support and DRS Mechanism: 

   - Many 2022 cars, like the Red Bull RB18, feature a central support strut with a visible DRS actuation mechanism at the top. Other cars, like the Ferrari F1-75, use a **double central support strut** for additional structural stability.

4. Wing Shape: 

   - The angle and configuration of the rear wing can vary between high-downforce and low-downforce tracks. For instance, the Red Bull RB18 employed a steeply angled upper element for high-downforce circuits, emphasizing aerodynamic grip.

Safety Enhancements:

- Rear Wing Tethers: 

   - As part of the increased focus on safety, the 2022 regulations introduced **rear wing tethers**, similar to the **wheel tethers** used since 1998. These tethers are designed to prevent the rear wing from detaching in the event of an impact.

   - Teams can use either of two configurations:

     1. Dual tethers: Each tether is connected to the outer ends of the wing and then to the gearbox casing.

     2. Single tether: The two outer tethers merge into one and connect to the gearbox casing.

These updates enhance both the aerodynamic performance and safety of Formula 1 cars, allowing closer racing with reduced aerodynamic disturbances while ensuring the structural integrity of the rear wing in crashes.

Innovative Idea: HAAS

Spoon rear wings are a unique design feature in Formula 1 that enhances aerodynamic performance by varying the downforce generated across the width of the wing.

Key Characteristics:

- Concave Shape: The wing adopts a spoon-like concave shape when viewed from the front of the car. This design causes the center of the wing to generate more downforce compared to the outer edges.

- **Downforce Distribution**: The **central section** of the wing is both **wider** and has a **higher angle of attack**, which allows it to produce higher downforce. In contrast, the **outer sections** (near the endplates) generate less downforce and, as a result, less **drag**. 

- **Drag Management**: The shape of the wing reduces the drag produced at the outboard edges, which is where **vortices** naturally form. In the past, these vortices were managed with **slots** in the wing endplates, but the spoon design simplifies this by minimizing drag at the source—on the outer edges.

### Purpose and Usage:

- **Optimal Balance**: The spoon wing provides a **balance between high downforce and reduced drag**, which is essential on tracks with a combination of **fast straights** and **slow corners**. By maintaining high downforce in the center while minimizing drag at the edges, this wing gives teams an advantage at circuits like **Spa** and **Baku**.

- **Compromise Design**: These wings are a **compromise** solution, as they enable higher downforce in specific sections without the penalty of increased drag across the entire wing. This makes them ideal for **high-speed tracks** that still require some level of aerodynamic grip in slower corners.

In summary, the spoon rear wing is an effective tool for maximizing aerodynamic efficiency, providing downforce where it's needed while reducing drag in areas where it can be detrimental to speed.

The +Drag Reduction System (DRS) plays a critical role in modern Formula 1 racing, especially in enhancing overtaking opportunities. Here’s a detailed look at how it functions and some innovations related to it:

Operation of DRS:

- Activation Zones: DRS can only be used within designated **DRS Zones** on the track. When a car enters one of these zones, the system is unlocked, but it only activates if the car is within **one second** of the car in front.

- Activation Point: The car must pass a **DRS activation point**, which triggers an indicator light on the cockpit display to alert the driver that DRS is available.

- Usage Restrictions: During a race, DRS is available only after **two laps** have been completed following the race start or a safety car period. The system's usage can also be suspended by the Race Director due to adverse weather conditions or safety concerns.

Historical Changes and Regulations:

- Practice and Qualifying: In the 2011 and 2012 seasons, DRS was unrestricted during practice and qualifying, not confined to specific zones. However, from 2013 onwards, the use of DRS zones was applied throughout the entire weekend, including practice and qualifying sessions.

- System Locking: Once activated during a race, the DRS system remains locked for the remainder of that lap, automatically deactivating when the driver applies the brakes.

Double DRS Systems:

To maximize the effectiveness of DRS, some teams have developed innovative systems known as **"double DRS"**:

- Mercedes’ Innovation: Mercedes was the pioneer of the double DRS system, introduced on its 2012 W03 car. This system aimed to extend the benefits of DRS to the front wing, in addition to improving the rear wing’s performance.

- Functionality: The double DRS system effectively increases the drag reduction on both the front and rear wings. This not only enhances straight-line speed but also optimizes aerodynamic efficiency during overtaking maneuvers.

Technical Aspects:

- Hydraulic Actuator: The DRS system operates through a hydraulic actuator mounted on the rear wing assembly. When activated by the driver via a button on the steering wheel, this actuator moves the wing's upper element to widen the gap and reduce drag.

- Impact on Performance: By reducing drag, DRS allows the car to accelerate faster and reach higher top speeds. This can result in an increase of approximately 800rpm or more at the end of a straight, influencing engine performance and overall speed.

- Deactivation: Once the driver hits the brakes or leaves the designated DRS zone, the system deactivates, and the wing element returns to its normal position to restore downforce.

Regulatory Evolution:

The regulations surrounding DRS have evolved to balance its effectiveness with fair competition. Innovations like double DRS systems and other aerodynamic enhancements are subject to scrutiny to ensure they comply with the FIA's rules and maintain the integrity of the sport.

Practical Example:

- Red Bull RB16B: At the 2021 Qatar Grand Prix, the Red Bull RB16B’s DRS hydraulic actuator was visible, showcasing the technology behind the system's operation.

These advancements in DRS and the continuous evolution of F1 regulations highlight the sport's focus on enhancing both performance and competitive fairness.

In the 2011 season, Mercedes experimented with a variation of the F-duct system. They used an air intake in the nose, which was supposed to cool the cockpit, to channel air through ducts in the front wing to vents at the rear edge of the wing. This airflow helped reduce drag by disrupting the flow over the front wing, similar to how the F-duct worked on the rear wing. The system was passive, meaning it only worked at high speeds, particularly on straights. However, it was banned for the 2012 season, as new regulations restricted nose holes to cooling the driver.

In 2012, Mercedes adapted the concept, no longer using the nose intake. Instead, they connected the ducts in the front wing to additional ducts in the chassis that led to the rear wing. When the DRS (Drag Reduction System) was activated, it uncovered holes in the rear wing, allowing air to flow through to the front wing, stalling it at the same time as the rear wing, further reducing drag.

Other teams, like Red Bull Racing, developed similar "double DRS" systems. Red Bull's version directed air to the rear wing’s lower beam element instead of the front wing, disrupting airflow to the diffuser and enhancing the DRS effect. However, these systems were banned for the 2013 season.

Small "monkey seat" wings started appearing on F1 cars in the early 2000s, but they became more common after 2014 when hybrid engines were introduced, and the "beam wing" was banned. Positioned above the crash structure and behind the exhaust, these devices helped increase rear downforce by using exhaust gases to improve the efficiency of the diffuser and rear wing. Teams extensively developed the monkey seat designs, with some variations being track-specific.

For the 2018 season, regulations were changed to require that any bodywork, including "monkey seats," must end at least 20mm in front of the exhaust tailpipe. This rule effectively eliminated the aerodynamic advantage of the monkey seat. Although teams could no longer use monkey seats, they instead turned to T-wings and other solutions to continue making modest aerodynamic gains.

T-wings first appeared on F1 cars in 2017, with the return of shark fins. Designers took advantage of a loophole in the regulations that allowed a narrow-chord wing to be mounted in a specific area at the rear of the car. Typically positioned on top of the shark fins, these T-wings sat above the rear wing and helped direct airflow to it. Due to the regulation changes, the rear wing had been mounted lower, and the T-wings improved airflow to it, providing a small boost in downforce with minimal drag. 

In addition to T-wings, some teams like Ferrari and Renault experimented with small, upswept fins on the upper rear edge of the crash structure. While not as effective as monkey seats, these devices helped manage airflow at the rear of the car.

However, with the regulation changes in 2022, the use of these rear-mounted aerodynamic appendages was effectively banned.

As mentioned in Chapter 2, the FIA tightly regulates the side-impact structures on F1 cars. While teams are allowed to manufacture these structures, they must follow a standard design and specific positioning requirements. Before 2017, teams universally extended the sidepods forward to cover these structures, making them invisible beneath the bodywork.

In 2017, Ferrari introduced a new design with their SF70H, where the sidepods were positioned behind the side-impact structures. This resulted in shorter sidepods, with the impact structures covered by sculpted fairings ahead of the sidepods. These fairings were not only protective but also provided aerodynamic benefits. By moving the sidepods rearwards, Ferrari improved the airflow into the sidepods, reducing disruption from the front tires’ wake. This also opened up space for aerodynamic devices to control airflow towards the rear of the car, benefiting the floor, diffuser, and rear wing.

By the 2018 season, several teams adopted Ferrari's design, leading to an explosion of development in this area. A variety of winglets and turning vanes began to appear on the fairings and sides of the chassis between the floor and side-impact structures. This trend continued through the 2021 season, with teams exploring different configurations for maximum aerodynamic gain. However, the new regulations introduced in 2022 closed off this area of development.

Even mandatory components like rear-view mirrors, cameras, and aerials are designed with aerodynamics in mind, though regulations are in place to minimize their use for aerodynamic advantage.

The cockpit wind deflector, or windscreen, is positioned at the front edge of the cockpit to protect the driver and also provides a small aerodynamic benefit. Without it, the driver’s helmet would be exposed to strong buffeting forces from the high-speed airflow, which could even lift the helmet—a serious safety risk. 

The wind deflector directs the high-speed air upwards, over the driver's head, toward the airbox and rear wing, reducing the turbulence around the cockpit. In recent years, teams like Mercedes have used serrated wind deflectors. This design helps further minimize buffeting by creating a smoother transition between the high-speed airflow above the driver's head and the slower air moving around the cockpit.

Aerodynamic Cooling

F1 cars generate immense heat from the engine, exhaust, transmission, brakes, and tires. In the hybrid era, this includes additional heat from the turbocharger and energy recovery system components. To ensure performance and reliability, effective cooling management is crucial.

Various radiators are positioned beneath the car's bodywork to cool different systems, requiring both a steady supply of cool air and efficient extraction of hot air. Managing airflow around and through the radiators, and over the hot components themselves, is key to effective aerodynamic cooling. By optimizing airflow, the size and weight of the radiators can be minimized, offering performance gains.

The challenge for aerodynamicists is to balance cooling with the car’s overall aerodynamic performance. This involves carefully positioning and sizing air intakes and outlet louvres to manage airflow efficiently. Additionally, cooling needs vary based on ambient and track temperatures, so teams must be able to adjust the cooling package for different conditions.

Throughout the season, the configuration, size, and placement of intakes, vents, and louvres evolve in response to these cooling requirements. Features like cooling "gills," seen on cars such as the 2022 Ferrari F1-75, reflect this ongoing development.

VOCAB

• Gurney flabs: is an example of vertical strakes under the rear and are small, rigid, adjustable trim tabs

• Raked: Cars have the front ride height noticeably lower than the rear (Red Bull F1 favorite attack adjustment)

• Diveplanes: Term comes form the use of a similar device on submarines to control the angle of 'dive' in the water

• Flow-Viz: Paint that is used to visualize the aerodynamicist of real-world of the car running on a track