Formula One Car - Formula Car Racing

A Formula One car is a single-seat, open cockpit, open-wheel racing car with substantial front and rear wings, and an engine positioned behind the driver, intended to be used in competition at Formula One racing events. The regulations governing the cars are unique to the championship. The Formula One regulations specify that cars must be constructed by the racing teams themselves, though the design and manufacture can be outsourced.

Construction

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Chassis design

The modern-day Formula One cars are constructed from composites of carbon fibre and similar ultra-lightweight materials. The minimum weight permissible is 702 kg (1,548 lb) including the driver but not fuel. Cars are weighed with dry-weather tyres fitted. Prior to the 2014 F1 season, cars often weighed in under this limit so teams added ballast in order to add weight to the car. The advantage of using ballast is that it can be placed anywhere in the car to provide ideal weight distribution. This can help lower the car's centre of gravity to improve stability and also allows the team to fine-tune the weight distribution of the car to suit individual circuits.

Engines

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The 2006 Formula One season saw the Fédération Internationale de l'Automobile (FIA) introduce a then-new engine formula, which mandated cars to be powered by 2.4-litre naturally aspirated engines in the V8 engine configuration, with no more than four valves per cylinder. Further technical restrictions, such as a ban on variable intake trumpets, have also been introduced with the new 2.4 L V8 formula to prevent the teams from achieving higher RPM and horsepower too quickly. The 2009 season limited engines to 18,000 rpm in order to improve engine reliability and cut costs.

For a decade, F1 cars had run with 3.0-litre naturally aspirated engines with all teams settling on a V10 layout by the end of the period; however, development had led to these engines producing between 980 and 1,000 hp (730 and 750 kW), and the cars reaching top speeds of 375 km/h (233 mph) (Jacques Villeneuve with Sauber-Ferrari) on the Monza circuit. Teams started to use exotic alloys in the late 1990s, leading to the FIA banning the use of exotic materials in engine construction, with only aluminium, titanium and iron alloys being allowed for the pistons, cylinders, connecting rods and crankshafts. The FIA has continually enforced material and design restrictions to limit power. Even with the restrictions, the V10s in the 2005 season were reputed to develop 980 hp (730 kW), power levels not seen since the ban on turbo-charged engines in 1989.

The lesser funded teams (the former Minardi team spends less than 50 million, while Ferrari spent hundreds of millions of euros a year developing their car) had the option of keeping the current V10 for another season, but with a rev limiter to keep them competitive with the most powerful V8 engines. The only team to take this option was the Toro Rosso team, which was the reformed and regrouped Minardi.

The engines consume around 450 l (15.9 ft³) of air per second. Race fuel consumption rate is normally around 75 l/100 km travelled (3.1 US mpg, 3.8 imp mpg, 1.3 km/l).

All cars have the engine located between the driver and the rear axle. The engines are a stressed member in most cars, meaning that the engine is part of the structural support framework, being bolted to the cockpit at the front end, and transmission and rear suspension at the back end.

In the 2004 championship, engines were required to last a full race weekend. For the 2005 championship, they were required to last two full race weekends and if a team changes an engine between the two races, they incur a penalty of 10 grid positions. In 2007, this rule was altered slightly and an engine only had to last for Saturday and Sunday running. This was to promote Friday running. In the 2008 season, engines were required to last two full race weekends; the same regulation as the 2006 season. However, for the 2009 season, each driver is allowed to use a maximum of 8 engines over the season, meaning that a couple of engines have to last three race weekends. This method of limiting engine costs also increases the importance of tactics, since the teams have to choose which races to have a new or an already-used engine.

As of the 2014 season, all F1 cars have been equipped with turbocharged 1.6-litre V6 engines. Turbochargers had previously been banned since 1988. This change may give an improvement of up to 29% fuel efficiency. One of the many reasons that Mercedes dominated the season early, was due to the placement of the turbocharger's compressor at one side of the engine, and the turbine at the other; both were then linked by a shaft travelling through the vee of the engine. The benefit is that air is not traveling through as much pipework, in turn reducing turbo lag and increases efficiency of the car. In addition, it means that the air moving through the compressor is much cooler as it is further away from the hot turbine section.

Transmission

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Formula One cars use semi-automatic sequential gearboxes, with regulations stating that 8 forward gears (increased from 7 from the 2014 season onwards) and 1 reverse gear must be used, with rear-wheel drive. The gearbox is constructed of carbon titanium, as heat dissipation is a critical issue, and is bolted onto the back of the engine. Full automatic gearboxes, and systems such as launch control and traction control, are illegal, to keep driver skill important in controlling the car. The driver initiates gear changes using paddles mounted on the back of the steering wheel and electro-hydraulics perform the actual change as well as throttle control. Clutch control is also performed electro-hydraulically, except to and from a standstill, when the driver operates the clutch using a lever mounted on the back of the steering wheel.

A modern F1 clutch is a multi-plate carbon design with a diameter of less than 100 mm (3.9 in), weighing less than 1 kg (2.2 lb) and handling around 720 hp (540 kW). As of the 2009 race season, all teams are using seamless shift transmissions, which allow almost instantaneous changing of gears with minimum loss of drive. Shift times for Formula One cars are in the region of 0.05 seconds. In order to keep costs low in Formula One, gearboxes must last five consecutive events and since 2015, gearbox ratios will be fixed for each season (for 2014 they could be changed only once). Changing a gearbox before the allowed time will cause a penalty of five places drop on the starting grid for the first event that the new gearbox is used.

Aerodynamics

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Aerodynamics have become key to success in the sport and teams spend tens of millions of dollars on research and development in the field each year.

The aerodynamic designer has two primary concerns: the creation of downforce, to help push the car's tyres onto the track and improve cornering forces; and minimising the drag that gets caused by turbulence and acts to slow the car down.

Several teams started to experiment with the now familiar wings in the late 1960s. Race car wings operate on the same principle as aircraft wings, but are configured to cause a downward force rather than an upward one. A modern Formula One car is capable of developing 6 g lateral cornering force (six times its own weight) thanks to aerodynamic downforce. The aerodynamic downforce allowing this is typically greater than the weight of the car. That means that, theoretically, at high speeds they could drive on the upside down surface of a suitable structure; e.g. on the ceiling.

Early experiments with movable wings and high mountings led to some spectacular accidents, and for the 1970 season regulations were introduced to limit the size and location of wings. Having evolved over time, similar rules are still used today.

In the late 1960s, Jim Hall of Chaparral first introduced "ground effect" downforce to auto racing. In the mid 1970s, Lotus engineers found out that the entire car could be made to act like a giant wing by the creation of an airfoil surface on its underside which would cause air moving relative to the car to push it to the road. Applying another idea of Jim Hall's from his Chaparral 2J sports racer, Gordon Murray designed the Brabham BT46B, which used a separately-powered fan system to extract air from the skirted area under the car, creating enormous downforce. After technical challenges from other teams, it was withdrawn after a single race. Rule changes then followed to limit the benefits of 'ground effects' - firstly a ban on the skirts used to contain the low pressure area, later a requirement for a 'stepped floor'.

Despite the full-sized wind tunnels and vast computing power used by the aerodynamic departments of most teams, the fundamental principles of Formula One aerodynamics still apply: to create the maximum amount of downforce for the minimal amount of drag. The primary wings mounted front and rear are fitted with different profiles depending on the downforce requirements of a particular track. Tight, slow circuits like Monaco require very aggressive wing profiles - you will see that cars run two separate 'blades' of 'elements' on the rear wings (two is the maximum permitted). In contrast, high-speed circuits like Monza see the cars stripped of as much wing as possible, to reduce drag and increase speed on the long straights.

Every single surface of a modern Formula One car, from the shape of the suspension links to that of the driver's helmet - has its aerodynamic effects considered. Disrupted air, where the flow 'separates' from the body, creates turbulence which creates drag - which slows the car down. Look at a recent car and you will see that almost as much effort has been spent reducing drag as increasing downforce - from the vertical end-plates fitted to wings to prevent vortices forming to the diffuser plates mounted low at the back, which help to re-equalise pressure of the faster-flowing air that has passed under the car and would otherwise create a low-pressure 'balloon' dragging at the back. Despite this, designers can't make their cars too 'slippery', as a good supply of airflow has to be ensured to help dissipate the vast amounts of heat produced by the engine and brakes.

In recent years, most Formula One teams have tried to emulate Ferrari's 'narrow waist' design, where the rear of the car is made as narrow and low as possible. This reduces drag and maximises the amount of air available to the rear wing. The 'barge boards' fitted to the sides of cars also helped to shape the flow of the air and minimise the amount of turbulence.

Revised regulations introduced in 2005 forced the aerodynamicists to be even more ingenious. In a bid to cut speeds, the FIA robbed the cars of a chunk of downforce by raising the front wing, bringing the rear wing forward and modifying the rear diffuser profile. The designers quickly clawed back much of the loss, with a variety of intricate and novel solutions such as the 'horn' winglets first seen on the McLaren MP4-20. Most of those innovations were effectively outlawed under even more stringent aero regulations imposed by the FIA for 2009. The changes were designed to promote overtaking by making it easier for a car to closely follow another. The new rules took the cars into another new era, with lower and wider front wings, taller and narrower rear wings, and generally much 'cleaner' bodywork. Perhaps the most interesting change, however, was the introduction of 'moveable aerodynamics', with the driver able to make limited adjustments to the front wing from the cockpit during a race.

That was usurped for 2011 by the new DRS (Drag Reduction System) rear wing system. This too allows drivers to make adjustments, but the system's availability is electronically governed - originally it could be used at any time in practice and qualifying (unless a driver is on wet-weather tyres), but during the race could only be activated when a driver is less than one second behind another car at pre-determined points on the track. (From 2013 DRS is available only at the pre-determined points during all sessions). The system is then deactivated once the driver brakes. The system "stalls" the rear wing by opening a flap, which leaves a 50mm horizontal gap in the wing, thus massively reducing drag and allowing higher top speeds, but also reducing downforce so it is normally used on longer straight track sections or sections which do not require high downforce. The system was introduced to promote more overtaking and is often the reason for overtaking on straights or at the end of straights where overtaking is encouraged in the following corner(s). However, the reception of the DRS system has differed among drivers, fans and specialists. Former Formula 1 driver Robert Kubica has been quoted of saying he "has not seen any overtaking moves in Formula 1 for two years", suggesting that the DRS is an unnatural way to pass cars on track but it does not actually require driver skill to successfully overtake a competitor, therefore it would not be overtaking.

The use of aerodynamics to increase the cars' grip was pioneered in Formula One in the late 1960s by Lotus, Ferrari and Brabham.

Wings

Early designs linked wings directly to the suspension, but several accidents led to rules stating that wings must be fixed rigidly to the chassis. The cars' aerodynamics are designed to provide maximum downforce with a minimum of drag; every part of the bodywork is designed with this aim in mind. Like most open-wheel cars they feature large front and rear aerofoils, but they are far more developed than American open-wheel racers, which depend more on suspension tuning; for instance, the nose is raised above the centre of the front aerofoil, allowing its entire width to provide downforce. The front and rear wings are highly sculpted and extremely fine 'tuned', along with the rest of the body such as the turning vanes beneath the nose, bargeboards, sidepods, underbody, and the rear diffuser. They also feature aerodynamic appendages that direct the airflow. Such an extreme level of aerodynamic development means that an F1 car produces much more downforce than any other open-wheel formula; Indycars, for example, produce downforce equal to their weight (that is, a downforce:weight ratio of 1:1) at 190 km/h (118 mph), while an F1 car achieves the same at 125 to 130 km/h (78 to 81 mph), and at 190 km/h (118 mph) the ratio is roughly 2:1.

The bargeboards in particular are designed, shaped, configured, adjusted and positioned not to create downforce directly, as with a conventional wing or underbody venturi, but to create vortices from the air spillage at their edges. The use of vortices is a significant feature of the latest breeds of F1 cars. Since a vortex is a rotating fluid that creates a low pressure zone at its centre, creating vortices lowers the overall local pressure of the air. Since low pressure is what is desired under the car, as it allows normal atmospheric pressure to press the car down from the top, by creating vortices downforce can be augmented while still staying within the rules prohibiting ground effects.

The F1 cars for the 2009 season came under much questioning due to the design of the rear diffusers of the Williams, Toyota and the Brawn GP cars raced by Jenson Button and Rubens Barrichello, dubbed double diffusers. Appeals from many of the teams were heard by the FIA, which met in Paris, before the 2009 Chinese Grand Prix and the use of such diffusers was declared as legal. Brawn GP boss Ross Brawn claimed the double diffuser design as "an innovative approach of an existing idea". These were subsequently banned for the 2011 season. Another controversy of the 2010 and '11 seasons was the front wing of the Red Bull cars. Several teams protested claiming the wing was breaking regulations. Footage from high speed sections of circuits showed the Red Bull front wing bending on the outsides subsequently creating greater downforce. Test were held on the Red Bull front wing however the FIA could find no way that the wing was breaking any regulation.

Since the start of the 2011 season, cars have been allowed to run with an adjustable rear wing, more commonly known as DRS (drag reduction system), a system to combat the problem of turbulent air when overtaking. On the straights of a track, drivers can deploy DRS, which opens the rear wing, reduces the drag of the car, allowing it to move faster. As soon as the driver touches the brake, the rear wing shuts again. In free practice and qualifying, a driver may use it whenever he wishes to, but in the race, it can only be used if the driver is 1 second, or less, behind another driver at the DRS detection zone on the race track, at which point it can be activated in the activation zone until the driver brakes.

Ground effect

F1 regulations heavily limit the use of ground effect aerodynamics which are a highly efficient means of creating downforce with a small drag penalty. The underside of the vehicle, the undertray, must be flat between the axles. A 10 mm thick wooden plank or skid block runs down the middle of the car to prevent the cars from running low enough to contact the track surface; this skid block is measured before and after a race. Should the plank be less than 9 mm thick after the race, the car is disqualified.

A substantial amount of downforce is provided by using a rear diffuser which rises from the undertray at the rear axle to the actual rear of the bodywork. The limitations on ground effects, limited size of the wings (requiring use at high angles of attack to create sufficient downforce), and vortices created by open wheels lead to a high aerodynamic drag coefficient (about 1 according to Minardi's technical director Gabriele Tredozi; compare with the average modern saloon car, which has a C_d value between 0.25 and 0.35), so that, despite the enormous power output of the engines, the top speed of these cars is less than that of World War II vintage Mercedes-Benz and Auto Union Silver Arrows racers. However, this drag is more than compensated for by the ability to corner at extremely high speed. The aerodynamics are adjusted for each track; with a low drag configuration for tracks where high speed is more important like Autodromo Nazionale Monza, and a high traction configuration for tracks where cornering is more important, like the Circuit de Monaco.

Regulations

With the 2009 regulations, the FIA rid F1 cars of small winglets and other parts of the car (minus the front and rear wing) used to manipulate the airflow of the car in order to decrease drag and increase downforce. As it is now, the front wing is shaped specifically to push air towards all the winglets and bargeboards so that the airflow is smooth. Should these be removed, various parts of the car will cause great drag when the front wing is unable to shape the air past the body of the car. The regulations which came into effect in 2009 have reduced the width of the rear wing by 25 cm, and standardised the centre section of the front wing to prevent teams developing the front wing.

Steering wheel

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The driver has the ability to fine-tune many elements of the race car from within the machine using the steering wheel. The wheel can be used to change gears, apply rev. limiter, adjust fuel/air mix, change brake pressure, and call the radio. Data such as engine rpm, lap times, speed, and gear are displayed on an LCD screen. The wheel hub will also incorporate gear change paddles and a row of LED shift lights. The wheel alone can cost about $50,000, and with carbon fibre construction, weighs in at 1.3 kilograms. In the 2014 season, certain teams such as Mercedes have chosen to use larger LCDs on their wheels which allow the driver to see additional information such as fuel flow and torque delivery. They are also more customisable owing to the possibility of using much different software.

Fuel

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The fuel used in F1 cars is fairly similar to ordinary petrol, albeit with a far more tightly controlled mix. Formula One fuel can only contain compounds that are found in commercial gasoline, in contrast to alcohol-based fuels used in American open-wheel racing. Blends are tuned for maximum performance in given weather conditions or different circuits. During the period when teams were limited to a specific volume of fuel during a race, exotic high-density fuel blends were used which were actually denser than water, since the energy content of a fuel depends on its mass density.

To make sure that the teams and fuel suppliers are not violating the fuel regulations, the FIA requires Elf, Shell, Mobil, Petronas and the other fuel teams to submit a sample of the fuel they are providing for a race. At any time, FIA inspectors can request a sample from the fueling rig to compare the "fingerprint" of what is in the car during the race with what was submitted. The teams usually abide by this rule, but in 1997, Mika Häkkinen was stripped of his third-place finish at Spa-Francorchamps in Belgium after the FIA determined that his fuel was not the correct formula, as well as in 1976, both McLaren and Penske cars were forced to the rear of the Italian Grand Prix after octane number of the mixture was found to be too high.

Tyres

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The 2009 season saw the re-introduction of slick tyres replacing the grooved tyres used from 1998 to 2008.

Tyres can be no wider than 355 and 380 mm (14.0 and 15.0 in) at the rear, front tyre width reduced from 270 mm to 245 mm for the 2010 season. Unlike the fuel, the tyres bear only a superficial resemblance to a normal road tyre. Whereas a roadcar tyre has a useful life of up to 80,000 km (50,000 mi), a Formula One tyre does not even last the whole race distance (a little over 300 km (190 mi)); they are usually changed two or three times per race, depending on the track. This is the result of a drive to maximise the road-holding ability, leading to the use of very soft compounds (to ensure that the tyre surface conforms to the road surface as closely as possible).

Since the start of the 2007 season, F1 had a sole tyre supplier. From 2007 to 2010, this was Bridgestone, but 2011 saw the reintroduction of Pirelli into the sport, following the departure of Bridgestone. Seven compounds of F1 tyre exist; 5 are dry weather compounds (hard, medium, soft, super-soft and ultra soft) while 2 are wet compounds (intermediates for damp surfaces with no standing water and full wets for surfaces with standing water). Two of the dry weather compounds (generally a harder and softer compound) are brought to each race, plus both wet weather compounds. The harder tyre is more durable but gives less grip, and the softer tyre the opposite. In 2009, the slick tyres returned as a part of revisions to the rules for the 2009 season; slicks have no grooves and give up to 18% more contact with the track. In the Bridgestone years, a green band on the sidewall of the softer compound was painted to allow spectators to distinguish which tyre a driver is on. With Pirelli tyres, the colour of the text and the ring on the sidewall varies with the compounds. Generally, the two dry compounds brought to the track are separated by at least one specification. This was implemented by the FIA to create more noticeable difference between the compounds and hopefully add more excitement to the race when two drivers are on different strategies. The exceptions are the Monaco GP, Singapore Grand Prix and the Hungaroring, where soft and super-soft tyres are brought, because they are notably slow and twisty and require a lot of grip.

Brakes

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Disc brakes consist of a rotor and caliper at each wheel. Carbon composite rotors (introduced by the Brabham team in 1976) are used instead of steel or cast iron because of their superior frictional, thermal, and anti-warping properties, as well as significant weight savings. These brakes are designed and manufactured to work in extreme temperatures, up to 1,000 degrees Celsius (1800 °F). The driver can control brake force distribution fore and aft to compensate for changes in track conditions or fuel load. Regulations specify this control must be mechanical, not electronic, thus it is typically operated by a lever inside the cockpit as opposed to a control on the steering wheel.

An average F1 car can decelerate from 100 to 0 km/h (62 to 0 mph) in about 15 meters (48 ft), compared with a 2009 BMW M3, which needs 31 meters (102 ft). When braking from higher speeds, aerodynamic downforce enables tremendous deceleration: 4.5 g to 5.0 g (44 to 49 m/s²), and up to 5.5 g (54 m/s²) at the high-speed circuits such as the Circuit Gilles Villeneuve (Canadian GP) and the Autodromo Nazionale Monza (Italian GP). This contrasts with 1.0 g to 1.5 g (10 to 15 m/s²) for the best sports cars (the Bugatti Veyron is claimed to be able to brake at 1.3 g). An F1 car can brake from 200 km/h (124 mph) to a complete stop in just 2.9 seconds, using only 65 metres (213 ft).

Performance

Every F1 car on the grid is capable of going from 0 to 160 km/h (100 mph) and back to 0 in less than five seconds. During a demonstration at the Silverstone circuit in Britain, an F1 McLaren-Mercedes car driven by David Coulthard gave a pair of Mercedes-Benz street cars a head start of seventy seconds, and was able to beat the cars to the finish line from a standing start, a distance of only 3.2 miles (5.2 km).

As well as being fast in a straight line, F1 cars have outstanding cornering ability. Grand Prix cars can negotiate corners at significantly higher speeds than other racing cars because of the intense levels of grip and downforce. Cornering speed is so high that Formula One drivers have strength training routines just for the neck muscles. Former F1 driver Juan Pablo Montoya claimed to be able to perform 300 repetitions of 50 lb (23 kg) with his neck.

The combination of light weight (642 kg in race trim for 2013), power (900 bhp with the 3.0 L V10, 780 bhp (582 kW) with the 2007 regulation 2.4 L V8, 950+ bhp with 2016 1.6 L V6 turbo), aerodynamics, and ultra-high-performance tyres is what gives the F1 car its high performance figures. The principal consideration for F1 designers is acceleration, and not simply top speed. Three types of acceleration can be considered to assess a car's performance:

• Longitudinal acceleration (speeding up)
• Longitudinal deceleration (braking)
• Lateral acceleration (turning)

All three accelerations should be maximised. The way these three accelerations are obtained and their values are:

Acceleration

The 2016 F1 cars have a power-to-weight ratio of 1,400 hp/t (1.05 kW/kg). Theoretically this would allow the car to reach 100 km/h (62 mph) in less than 1 second. However the massive power cannot be converted to motion at low speeds due to traction loss and the usual figure is 2.5 seconds to reach 100 km/h (62 mph). After about 130 km/h (80 mph) traction loss is minimal due to the combined effect of the car moving faster and the downforce, hence continuing to accelerate the car at a very high rate. The figures are (for the 2016 Mercedes W07):

• 0 to 100 km/h (62 mph): 2.4 seconds
• 0 to 200 km/h (124 mph): 4.4 seconds
• 0 to 300 km/h (186 mph): 8.4 seconds

The acceleration figure is usually 1.45 g (14.2 m/s²) up to 200 km/h (124 mph), which means the driver is pushed by the seat with a force whose acceleration is 1.45 times that of Earth's gravity.

There are also boost systems known as kinetic energy recovery systems (KERS). These devices recover the kinetic energy created by the car's braking process. They store that energy and convert it into power that can be called upon to boost acceleration. KERS typically adds 80 hp (60 kW) and weighs 35 kg (77 lb). There are principally two types of systems: electrical and mechanical flywheel. Electrical systems use a motor-generator incorporated in the car's transmission which converts mechanical energy into electrical energy and vice versa. Once the energy has been harnessed, it is stored in a battery and released at will. Mechanical systems capture braking energy and use it to turn a small flywheel which can spin at up to 80,000 rpm. When extra power is required, the flywheel is connected to the car's rear wheels. In contrast to an electrical KERS, the mechanical energy does not change state and is therefore more efficient. There is one other option available, hydraulic KERS, where braking energy is used to accumulate hydraulic pressure which is then sent to the wheels when required.

Deceleration

The carbon brakes in combination with tyre technology and the car's aerodynamics produce truly remarkable braking forces. The deceleration force under braking is usually 4 g (39 m/s²), and can be as high as 5â€"6 g when braking from extreme speeds, for instance at the Gilles Villeneuve circuit or at Indianapolis. In 2007, Martin Brundle, a former Grand Prix driver, tested the Williams Toyota FW29 Formula 1 car, and stated that under heavy braking he felt like his lungs were hitting the inside of his ribcage, forcing him to exhale involuntarily. Here the aerodynamic drag actually helps, and can contribute as much as 1.0 g of braking force, which is the equivalent of the brakes on most road sports cars. In other words, if the throttle is let go, the F1 car will slow down under drag at the same rate as most sports cars do with braking, at least at speeds above 250 km/h (160 mph). The drivers do not utilise engine (compression) braking, although it may seem this way. The only reason they change down gears prior to entering the corner is to be in the correct gear for maximum acceleration on the exit of the corner.

There are three companies who manufacture brakes for Formula One. They are Hitco (based in the US, part of the SGL Carbon Group), Brembo in Italy and Carbone Industrie of France. Whilst Hitco manufacture their own carbon/carbon, Brembo sources theirs from Honeywell, and Carbone Industrie purchases their carbon from Messier Bugatti.

Carbon/carbon is a short name for carbon fibre reinforced carbon. This means carbon fibres strengthening a matrix of carbon, which is added to the fibres by way of matrix deposition (CVI or CVD) or by pyrolysis of a resin binder.

F1 brakes are 278 mm (10.9 in) in diameter and a maximum of 28 mm (1.1 in) thick. The carbon/carbon brake pads are actuated by 6-piston opposed callipers provided by Akebono, AP Racing or Brembo. The callipers are aluminium alloy bodied with titanium pistons. The regulations limit the modulus of the calliper material to 80 GPa in order to prevent teams using exotic, high specific stiffness materials, for example, beryllium. Titanium pistons save weight, and also have a low thermal conductivity, reducing the heat flow into the brake fluid.

Lateral acceleration

The aerodynamic forces of a Formula 1 car can produce as much as three times the car's weight in downforce. In fact, at a speed of just 130 km/h (81 mph), the downforce is equal in magnitude to the weight of the car. At low speeds, the car can turn at 2.0 g. At 210 km/h (130 mph) already the lateral force is 3.0 g, as evidenced by the famous esses (turns 3 and 4) at the Suzuka circuit. Higher-speed corners such as Blanchimont (Circuit de Spa-Francorchamps) and Copse (Silverstone Circuit) are taken at above 5.0 g, and 6.0 g has been recorded at Suzuka's 130-R corner. This contrasts with a maximum for high performance road cars such as Enzo Ferrari of 1.5 g or Koenigsegg One:1 of above 1.7 g for the Circuit de Spa-Francorchamps.

The large downforce allows an F1 car to corner at very high speeds. As an example of the extreme cornering speeds; the Blanchimont and Eau Rouge corners at Spa-Francorchamps are taken flat-out at above 300 km/h (190 mph), whereas the race-spec touring cars can only do so at 150â€"160 km/h (note that lateral force increases with the square of the speed). A newer and perhaps even more extreme example is the Turn 8 at the Istanbul Park circuit, a 190° relatively tight 4-apex corner, in which the cars maintain speeds between 265 and 285 km/h (165 and 177 mph) (in 2006) and experience between 4.5 g and 5.5 g for 7 secondsâ€"the longest sustained hard cornering in Formula 1.

Top speeds

Top speeds are in practice limited by the longest straight at the track and by the need to balance the car's aerodynamic configuration between high straight line speed (low aerodynamic drag) and high cornering speed (high downforce) to achieve the fastest lap time. During the 2006 season, the top speeds of Formula 1 cars were a little over 300 km/h (185 mph) at high-downforce tracks such as Albert Park, Australia and Sepang, Malaysia. These speeds were down by some 10 km/h (6 mph) from the 2005 speeds, and 15 km/h (9 mph) from the 2004 speeds, due to the recent performance restrictions (see below). On low-downforce circuits greater top speeds were registered: at Gilles-Villeneuve (Canada) 325 km/h (203 mph), at Indianapolis (USA) 335 km/h (210 mph), and at Monza (Italy) 360 km/h (225 mph). In testing one month prior to the 2005 Italian Grand Prix, Juan Pablo Montoya of the McLaren-Mercedes F1 team recorded a record top speed of 372.6 km/h (231.5 mph), which got officially recognised by the FIA as the fastest speed ever achieved by an F1 car, even though it was not set during an officially sanctioned session during a race weekend. In the 2005 Italian GP Kimi Räikkönen of Mclaren-Mercedes was recorded at 370.1 km/h (229.9 mph). This record was broken at the 2016 Mexican Grand Prix by Williams driver Valtteri Bottas, whose top speed in race conditions was 372.54 km/h (231.48 mph). However, even though this information was shown in FIA's official monitors, the FIA is yet to accept it as an official record. Bottas had previously set an even higher record top speed during qualifying for the 2016 European Grand Prix, recording a speed of 378.035 km/h (234.9 mph), albeit through the use of slipstream drafting. This top speed is yet to be confirmed by any official method as currently the only source of this information is the Williams team's Twitter post, while the FIA's official speed trap data measured Bottas' speed at 366.1 kmh in that instance. At the moment Montoya's speed of 372.6 kmh (231.5 mph) is still regarded as the official record, even though it was not set during a sanctioned session.

Away from the track, the BAR Honda team used a modified BAR 007 car, which they claim complied with FIA Formula One regulations, to set an unofficial speed record of 413 km/h (257 mph) on a one way straight line run on 6 November 2005 during a shakedown ahead of their Bonneville 400 record attempt. The car was optimised for top speed with only enough downforce to prevent it from leaving the ground. The car, badged as a Honda following their takeover of BAR at the end of 2005, set an FIA ratified record of 400 km/h (249 mph) on a one way run on 21 July 2006 at Bonneville Speedway. On this occasion the car did not fully meet FIA Formula One regulations, as it used a moveable aerodynamic rudder for stability control, breaching article 3.15 of the 2006 Formula One technical regulations which states that any specific part of the car influencing its aerodynamic performance must be rigidly secured.

Specifications

2007

Chassis

• Construction: Carbon-fibre and honeycomb composite structure
• Gearbox: 7-speed seamless semi-automatic paddle shift sport gearbox, longitudinally mounted with hydraulic system for power shift and clutch operation
• Clutch: Multi-plate carbon clutch
• Clutch operation: Hand-paddle behind steering wheel below gear shift paddle
• Weight: 642 kg (1,415 lb) including driver
• Fuel capacity: Approx. 150 L (40 US gal; 33 imp gal)
• Length: Averaging 4,545â€"4,800 mm (179â€"189 in)
• Width: 1,800 mm (71 in)
• Height: 950 mm (37 in)
• Wheelbase: 2,995â€"3,100 mm (118â€"122 in)
• Steering: Power-assisted rack and pinion steering
• Brakes: 6-piston (front and rear) carbon callipers, carbon discs and pads
• Brake disc size: 278 x 28 mm (front and rear)
• Dampers: Vendor chosen by each manufacturer. Four way bump and rebound adjustable
• Springs: Vendor chosen by each manufacturer
• Front and rear suspension: Aluminium alloy uprights, carbon-composite double wishbone with springs and anti-roll bar
• Wheel rims: Forged aluminium or magnesium wheels
  • Front wheel size: 12.7 x 13 in
  • Rear wheel size: 13.4 x 13 in
• Tyres: Bridgestone Potenza 4-line grooved slick dry and treaded intermediate-wet tyres
• Safety equipment: 6-point seatbelt, HANS device
• Steering wheel dash: Various

Engine

• Manufacturers: Mercedes-Benz, Renault, Ferrari, Honda, BMW and Toyota
• Year engine allowance: 2006 and 2007
• Configuration: V8 naturally aspirated engine
• V-angle: 90° cylinder angle
• Displacement: 2.4 L (146 cu in)
• Bore: Maximum 98 mm (4 in)
• Valvetrain: DOHC, 32-valve, four valves per cylinder
• Fuel: 98-102 RON unleaded gasoline
• Fuel Delivery: Indirect electronic fuel injection
• Aspiration: Naturally aspirated
• Power Output: 750 hp (559 kW) @ 18000 rpm
• Torque: Approx. 240 N·m (177 ft·lb)
• Lubrication: Dry sump
• Maximum Revs: 18,000 rpm
• Engine management: Various
• Max. speed: 360 km/h (224 mph)
• Cooling: Single water pump
• Ignition: High energy inductive (laptop/coil controlled)

2011-2013

Chassis

• Construction: Carbon-fibre and honeycomb composite structure
• Gearbox: 7-speed seamless semi-automatic paddle shift sport gearbox, longitudinally mounted with hydraulic system for power shift and clutch operation
• Clutch: Multi-plate carbon clutch
• Clutch operation: Hand-paddle behind steering wheel below gear shift paddle
• Weight: 642 kg (1,415 lb) including driver
• Fuel capacity: Approx. 150 L (40 US gal; 33 imp gal)
• Length: Averaging 4,995â€"5,240 mm (197â€"206 in)
• Width: 1,800 mm (71 in)
• Height: 950 mm (37 in)
• Wheelbase: 2,995â€"3,400 mm (118â€"134 in)
• Steering: Power-assisted rack and pinion steering
• Brakes: 6-piston (front and rear) carbon callipers, carbon discs and pads
• Brake disc size: 278 x 28 mm (front and rear)
• Dampers: Vendor chosen by each manufacturer. Four way bump and rebound adjustable
• Springs: Vendor chosen by each manufacturer
• Front and rear suspension: Aluminium alloy uprights, carbon-composite double wishbone with springs and anti-roll bar (FRICS) front and rear interconnecting suspension system removed due to questionable legality on all cars late in the 2013 season.
• Wheel rims: Forged aluminium or magnesium wheels
  • Front wheel size: 12 x 13 in
  • Rear wheel size: 13.7 x 13 in
• Tyres: Pirelli P Zero slick dry and Pirelli Cinturato treaded intermediate-wet tyres
  • Front tyre size: 245/660-R13
  • Rear tyre size: 325/660-R13
• Safety equipment: 6-point seatbelt, HANS device

Engine

• Manufacturers: Renault, Ferrari, Mercedes-Benz and Cosworth
• Configuration: V8 naturally aspirated engine
• V-angle: 90° cylinder angle
• Displacement: 2.4 L (146 cu in)
• Bore: Maximum 98 mm (4 in)
• Valvetrain: DOHC, 32-valve, four valves per cylinder
• Fuel: 94.25% 98-102 RON unleaded gasoline + 5.75% biofuel
• Fuel Delivery: Indirect electronic fuel injection
• Aspiration: Naturally aspirated
• Power Output: 750 + 80 hp (559 + 60 kW) @ 18000 rpm depending on KERS mode
• Torque: Approx. 240 N·m (177 ft·lb)
• Lubrication: Dry sump
• Maximum Revs: 18,000 rpm
• Engine management: McLaren Electronic Systems TAG-320 (since 2013)
• Max. speed: 360 km/h (224 mph)
• Cooling: Single water pump
• Ignition: High energy inductive (laptop/coil controlled)

Technical specifications for 2014

Engine (majors)

1.6-litre V6 turbo engine and two Energy Recovery Systems (ERS) with ~750 hp.

• Exhaust: Single exhaust with central exit

Chassis

• Fuel capacity: 150 L (40 US gal; 33 imp gal) according to FIA Formula One regulations, 100 kg is equivalent to 130â€"140 L (34â€"37 US gal; 29â€"31 imp gal) per race
• Gearbox: 8-speed, fixed ratio
• Front downforce wing: Width of wing reduced from 1,800 mm to 1,650 mm
• Rear downforce wing: Shallower rear wing flap and abolition of beam wing
• Car weight: Minimum weight increased by 49 kg, up from 642 kg to 691 kg
• Height: Nose and chassis height reduced (the height of the chassis has been reduced from 625 mm to 525 mm, whilst the height of the nose has been dramatically slashed from 550 mm to 185 mm).

Technical specifications for 2015

Engine (majors)

• Intake Variable length intake system

Chassis

• Length: 5010â€"5100 mm (Red Bull/Toro Rosso), 5180 mm (Mercedes/Force India), 5130 mm (Ferrari/Sauber/Lotus), 5000 mm (Williams/McLaren/Manor)

Recent FIA performance restrictions

In an effort to reduce speeds and increase driver safety, the FIA has continuously introduced new rules for F1 constructors since the 1980s.

These rules have included the banning of such ideas as the "wing car" (ground effect) in 1983; the turbocharger in 1989 (these were reintroduced for 2014); active suspension and ABS in 1994; slick tyres (these were reintroduced for 2009); smaller front and rear wings and a reduction in engine capacity from 3.5 to 3.0 litres in 1995; reducing the width of the cars from over 2 metres to around 1.8 metres in 1998; again a reduction in engine capacity from 3.0 to 2.4 litres in 2006; traction control in 1994, and again in 2008 alongside launch control and engine braking after electronic aids were reintroduced in 2001. Yet despite these changes, constructors continued to extract performance gains by increasing power and aerodynamic efficiency. As a result, the pole position speed at many circuits in comparable weather conditions dropped between 1.5 and 3 seconds in 2004 over the prior year's times. The aerodynamic restrictions introduced in 2005 were meant to reduce downforce by about 30%, however most teams were able to successfully reduce this to a mere 5 to 10% downforce loss. In 2006 the engine power was reduced from 950 to 750 bhp (710 to 560 kW) by shifting from the 3.0L V10s, used for over a decade, to 2.4L V8s. Some of these new engines were capable of achieving 20,000 rpm during 2006, though for the 2007 season engine development was frozen and the FIA limited all engines to 19,000 rpm to increase reliability and control at increasing engine speeds.

In 2008, the FIA further strengthened its cost-cutting measures by stating that gearboxes are to last for 4 grand prix weekends, in addition to the 2 race weekend engine rule. Furthermore, all teams were required to use a standardised ECU supplied by MES (McLaren Electronic Systems) made in conjunction with Microsoft. These ECUs have placed restrictions on the use of electronic driver aids such as traction control, launch control and engine braking. The emphasis being on reducing costs as well as placing the focus back onto driver skills as opposed to the so-called 'electronic gizmos' mainly controlling the cars.

Changes were made for the 2009 season to increase dependency on mechanical grip and create overtaking opportunities - resulting in the return to slick tyres, a wider and lower front wing with a standardized centre section, a narrower and taller rear wing, and the diffuser being moved backwards and made taller yet less efficient at producing downforce. Overall aerodynamic grip was dramatically reduced with the banning of complex appendages such as winglets, bargeboards and other aero devices previously used to better direct airflow over and under the cars. The maximum engine speed was reduced to 18,000 rpm to increase reliability further and conform to engine life demand.

Due to increasing environmental pressures from lobby groups and the like, many have called into question the relevance of Formula 1 as an innovating force towards future technological advances (particularly those concerned with efficient cars). The FIA has been asked to consider how it can persuade the sport to move down a more environmentally friendly path. Therefore, in addition to the above changes outlined for the 2009 season, teams were invited to construct a KERS device, encompassing certain types of regenerative braking systems to be fitted to the cars in time for the 2009 season. The system aims to reduce the amount of kinetic energy converted to waste heat in braking, converting it instead to a useful form (such as electrical energy or energy in a flywheel) to be later fed back through the engine to create a power boost. However unlike road car systems which automatically store and release energy, the energy is only released when the driver presses a button and is useful for up to 6.5 seconds, giving an additional 80 hp (60 kW) and 400 kJ. It effectively mimicks the 'push to pass' button from IndyCar and A1GP series. KERS was not seen in the 2010 championship - while it was not technically banned, the FOTA collectively agreed not to use it. It however made a return for the 2011 season, with all teams except HRT, Virgin and Lotus utilizing the device.

The regulations for the 2014 season limit the maximum fuel mass flow to the engine to 100 kg/h, which reduces the maximum power output from the current 550 kW to about 450 kW. The rules also double the power limit of the electric motor to 120 kW for both acceleration and energy recovery, and increase the maximum amount of energy the KERS is allowed to use to 4 MJ per lap, with charging limited to 2 MJ per lap. An additional electric motor-generator unit may be connected to the turbocharger.

See also

Pitot tube

References

External links

• Official F1 site
• F1 Technical
• Animated F1 Car Guide
• Official F1 site Technical analysis
• Racecar Engineering Cars
• Racecar Engineering Engines
• Formula1.com