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The 24 Hours of Le Mans 

This was seen at the Simeone Foundation Automotive Museum                                                                               

http://www.simeonemuseum.org/

The 24 Hours of Le Mans (French: 24 Heures du Mans) is the world's oldest active sports car race in endurance racing, held annually since 1923 near the town of Le Mans, France. It is one of the most prestigious automobile races in the world and has been called the "Grand Prix of Endurance and Efficiency". The event represents one leg of the Triple Crown of Motorsport; other events being the Indianapolis 500 and the Monaco Grand Prix.

The race is organized by the Automobile Club de l'Ouest (ACO) and is held on the Circuit de la Sarthe, which contains a mix of closed public roadways and dedicated sections of racing track, in which racing teams must balance the demands of speed with the cars' ability to run for 24 hours while remaining free of crippling mechanical failure. The brutality of this race can be readily understood by comparing the list of teams who set off from the start line against the roster of cars that survive for the full duration. Of the 60 cars which qualified for the 2017 race, only 49 cars ran the full duration successfully.

Since 2012, the 24 Hours of Le Mans has been a part of the FIA World Endurance Championship. In 2017, it will be the third round of the season.

Over the years, Le Mans influenced events have sprung up all around the globe, popularizing the 24-hour format at places like Daytona, Nürburgring, Spa-Francorchamps, and Bathurst. The American Le Mans Series and Europe's Le Mans Series of multi-event sports car championships were spun off from 24 Hours of Le Mans regulations. Other races include the Le Mans Classic, a race for historic Le Mans race cars from years' past held on the Circuit de la Sarthe, a motorcycle version of the race which is held on the shortened Bugatti version of the same circuit, a kart race (24 Heures Karting), a truck race (24 Heures Camions), and a parody race 24 Hours of LeMons.

Purpose

At a time when Grand Prix motor racing was the dominant form of motorsport throughout Europe, Le Mans was designed to present a different test. Instead of focusing on the ability of a car company to build the fastest machines, the 24 Hours of Le Mans would instead concentrate on the ability of manufacturers to build sporty yet reliable cars. This encouraged innovation in producing reliable and fuel-efficient vehicles, because endurance racing requires cars that last and spend as little time in the pits as possible.

At the same time, the layout of the track necessitated cars with better aerodynamics and stability at high speeds. While this was shared with Grand Prix racing, few tracks in Europe had straights of a length comparable to the Mulsanne. Additionally, because the road is public and thus not as meticulously maintained as permanent racing circuits, racing puts more strain on the parts, increasing the importance of reliability.

The oil crisis in the early 1970s led organizers to adopt a fuel economy formula known as Group C that limited the amount of fuel each car was allowed. Although it was later abandoned, fuel economy remains important as new fuel sources reduced time spent during pit stops. Such technological innovations have had a trickle-down effect and can be incorporated into consumer cars. This has also led to faster and more exotic supercars as manufacturers seek to develop faster road cars in order to develop them into even faster GT cars.

Additionally, in recent years hybrid systems (flywheel, super-capacitor, battery coupled with both gasoline and diesel) have been championed in the LMP category as rules have been changed to their benefit and to further push efficiency.

The race

The race is held in June, leading at times to very hot conditions for drivers, particularly in closed vehicles with poor ventilation; rain is commonly seen. The race begins in mid-afternoon and finishes the following day at the same hour the race started the previous day. Over the 24 hours, modern competitors often cover distances well over 5,000 km (3,110 mi). The record is 2010's 5,410 km (3,360 mi), six times the length of the Indianapolis 500, or approximately 18 times longer than a Formula One Grand Prix. Drivers and racing teams strive for speed and avoiding mechanical damage, as well as managing the cars' consumables, primarily fuel, tires, and braking materials. It also tests endurance, with drivers frequently racing for over two hours before a relief driver can take over during a pit stop while they eat and rest. Current regulations mandate that three drivers share each competing vehicle.

Competing teams race in groups called "classes", or cars of similar specification, while also competing simultaneously for outright placing amongst all classes. Originally, the race showcased cars as they were sold to the general public, then called "Sports Cars", in contrast with the specialized racing carsused in Grand Prix motor racing. Over time, the competing vehicles evolved away from their publicly available road car roots, and today the race is made of two overall classes: prototypes, and Grand Touring cars (similar to sports cars sold to the public). These are further broken down into 2 sub-classes each, constructors' prototypes, privateer prototypes and 2 subclasses of GT cars.

Competing teams have had a wide variety of organization, ranging from competition departments of road car manufacturers (eager to prove the supremacy of their products) to professional motor racing teams (representing their commercial backers, some of which are also car manufacturers who want to win without paying for their own teams) to amateur teams (racing as much to compete in the famous race as to claim victory for their commercial partners).

The race has also spent long periods as a round of the World Sportscar Championship, although Le Mans has always had a stronger reputation than the World Championship, and is a round of the FIA World Endurance Championship. The race is also known as a leg of the informal Triple Crown of Motorsport which links Formula One, IndyCar, and sports car racing to represent a career achievement for drivers. Additionally, it is seen as a leg of the Triple Crown of endurance racing, which links the three largest sports car races together, with 12 Hours of Sebring and 24 Hours of Daytona forming the other legs. Since 1998, the American Le Mans Series holds a second endurance race along with the 12 hours of Sebring every year called "Petit Le Mans", as a 10-hour American version. In 2014, the Tudor Sports Car Championship (a merger of the races at Sebring; Petit Le Mans in Braselton, Georgia; the 6 Hours of Watkins Glen in Watkins Glen, New York; and the Rolex Sports Car Series' 24 Hours of Daytona) held all four major American endurance classics in preparation for teams to race at Le Mans.

Cars

The race has approximately 60 competitors. Each car was required to have at least two seats, but recently cars only need the ability to accommodate a second seat in the cockpit rather than the seat itself. No more than two doors are allowed; open cockpit cars do not require doors. Since 2014, all cars in the premier LMP1 category must have a roof due to safety concerns, with open-cockpit cars only permitted in the slightly slower LMP2 category. Since 2017, all prototype cars, LMP1 or LMP2, must have closed cockpits.

Although all cars compete at the same time, there are separate classes. A prize is awarded to the winner of each class, and to the overall winner. The number of classes has varied over the years, but there are now four. Custom-built Le Mans Prototypes (LMP) are the top two classes, LMP1 and LMP2, divided by speed, weight, and power output. From 2011, the next two classes are production-based grand tourer (GT) classes, GT Endurance Pro and GT Endurance AM. Both of these classes utilize the LM GTE, or "Le Mans Grand Touring Endurance" regulations. Although the top class is the most likely to be the overall winner, lower classes have won on occasion due to better reliability.

Drivers

Originally, there were no rules on the number of drivers of a car, or how long they could drive. Although almost all teams used two drivers in the early decades, some Le Mans drivers such as Pierre Levegh and Eddie Hall attempted to run the race solo, hoping to save time by not having to change drivers. This practice was later banned. Until the 1980s, there were teams in which only two drivers competed, but by the end of the decade, the rules were changed to stipulate that at least three drivers must drive each car.

By the 1990s, due to the speeds of the cars and the strain it puts on drivers, additional rules to reduce driver fatigue mandated that drivers could not drive for over 240 minutes over a 6-hour period, and that no one driver could run for over 14 hours total. With careful management of driver stints, this makes it possible to complete the race with only two drivers (as Jeroen Bleekemolen and Cooper MacNeil did in 2014), although the vast majority of teams still continue to use three drivers.

Traditions and unique rules

Although it has been a part of the World Sportscar Championship for most of its existence, the race has had different regulations for safety and competition reasons partly due to its length. For many decades, cars were required to run at least an hour into the race before they were allowed to refill fluids for the car, such as oil or coolant, with the exception of fuel. This was an attempt by the ACO to help increase efficiency and reliability. Cars which could not last the first hour without having to replace lost fluids were disqualified.

Another rule unique to Le Mans is that cars must be switched off while they are refuelled in the pits. Not only is this safer and less of a fire hazard, but it is also another test of reliability, as cars with the ability to restart many times under race conditions are harder. Another element of this rule is that mechanics are not allowed to work on the car while it is being refuelled (other than helping a driver in or out of the car), which has led teams to adapt innovative ways in which to decrease the time of these lengthy pit stops. Drivers are allowed to get out of the car and be replaced by another driver during refuelling. Those rules are also in application in the FIA World Endurance Championship.

There are various long-standing traditions at Le Mans, including the waving of the French tricolor to start the race. This is usually followed by a fly-over featuring jets trailing blue, white and red smoke. A similar flag tradition is the waving of safety flags during the final lap of the race by track marshals, congratulating the winners and other finishers.

Le Mans was the venue for the first televised instance of a winning driver celebrating by spraying champagne instead of drinking it. When Dan Gurney won the 1967 race with co-driver A. J. Foyt, the two drivers mounted the victory podium and Gurney was handed a magnum of champagne. Looking down, he saw Ford CEO Henry Ford II, team owner Carroll Shelby and their wives, as well as several journalists who had predicted disaster for the high-profile duo. Gurney shook the bottle and sprayed everyone nearby. Gurney autographed and gave the bottle of champagne to Life photographer Flip Schulke, who used it as a lamp for years before returning it to Gurney.

Schedule

The first race was held on 26 and 27 May 1923 and has since been run annually in June with exceptions in 1956, when the race was held in July, and 1968, when it was held in September due to nationwide political turmoil in May. The race has been cancelled ten times—in 1936 (a labour strike during the Great Depression) and between 1940 and 1948 (World War II).

The race usually takes place on the second weekend of June, with qualifying and practice taking place on the Wednesday and Thursday before the race, following a car inspection on Monday and Tuesday. Currently, these sessions are held in the evening, with two separate two-hour sessions held each night. Friday serves as a day of rest and a parade of all the drivers through Le Mans is held.

Test days held at the end of April or beginning of May served as a pre-qualification weeding out the slowest cars. However, in 2005 the exorbitant cost of transporting cars to and from Le Mans led organizers to move the test day to the first weekend of June. In fact pre-qualification was eliminated in 2000, meaning that all competitors invited to the test would be allowed into the race.

Since 2001 the Le Mans Legend races have also been part of the schedule, usually running exhibition races during qualifying days, a few hours prior to the sessions for the Le Mans entrants.

Until 2008, the race started at 16:00 on Saturday (though in 1968, the race started at 14:00 due to the lateness of the race on the calendar. In 1984 and 2007, the start time was moved ahead to 15:00 due to the conflicting election). In 2006, the ACO scheduled a 17:00 start time on Saturday, 17 June in order to maximize television coverage in between the World Cup games. Since 2009, when the race took place from 13–14 June, it starts at 15:00 local time (13:00 GMT).

The race traditionally began with what became known as the Le Mans start, in which cars were lined up along the length of the pits. Until 1962, cars were lined up in order of engine capacity, but beginning in 1963 qualifying times determined the lineup. The starting drivers stood on the opposite side of the front stretch. When the French flag dropped to signify the start, the drivers ran across the track, entered and started their cars without assistance, and drove away. This became a safety issue in the late 1960s when some drivers ignored their safety harnesses, then a recent invention. This led to drivers running the first few laps either improperly harnessed due to attempting to do it while driving or sometimes not even harnessed at all, leading to several deaths when cars were involved in accidents due to the bunched field at the start.

This starting method inspired Porsche to locate the ignition key switch to the left of the steering wheel. In a left-hand drive car, this allowed the driver to use his left hand to start the engine, and his right hand to put the transmission into gear, which in turn shaves off a few tenths of a second.

Another method for speeding up the start was developed by Stirling Moss. His car was waiting with first gear already engaged. When he jumped in, he switched the starter on without depressing the clutch. The car was immediately jerked forward by the starter motor, but the engine did not start due to low RPM. After a few seconds of motion, he then pushed the clutch down, allowing the engine to speed up and start while the car was moving.

Feeling this type of start was unsafe, in the 1969 race, Jacky Ickx opposed it by walking across the track while his competitors ran. Although he was nearly hit by a faster competitor's car while walking, Ickx took the time to fasten his safety belts before pulling away. Privateer John Woolfe died in an accident on the first lap of that race; Ickx won.

The traditional Le Mans start was changed for 1970. Cars were still lined up along the pit wall, but the drivers were already inside and strapped in. At the dropping of the French tricolor, the drivers started their engines and drove away. Since 1971, when that method was done away with, a rolling start (sometimes known as an Indianapolis start) begins the race.

The circuit

The circuit on which the 24 Hours of Le Mans is run is named the Circuit de la Sarthe, after the department that Le Mans is within. It consists of both permanent track and public roads that are temporarily closed for the race. Since 1923, the track has been extensively modified, mostly for safety reasons, and now is 13.629 km (8.469 mi) in length. Although it initially entered the town of Le Mans, the track was cut short in order to better protect spectators. This led to the creation of the Dunlop Curve and Tertre Rouge corners before rejoining the old circuit on the Mulsanne. Another major change was on the Mulsanne itself in 1990, when the FIA decreed that it would no longer sanction any circuit that had a straight longer than 2 km (1.2 mi). To comply with this, two chicanes were added to the 6 km long straight. The addition of the chicanes was further influenced by the fact that the speed of WM P88-Peugeot French driver Roger Dorchy had been timed at 405 km/h (252 mph) during the 1988 race.

Due to the shorter length of the straights, top speeds at Le Mans are now generally around 205 mph (330 km/h).

The public sections of the track differ from the permanent circuit, especially in comparison with the Bugatti Circuit which is inside the Circuit de la Sarthe. Due to heavy traffic in the area, the public roads are not as smooth or well kept. They also offer less grip because of the lack of soft-tyre rubber laid down from racing cars, though this only affects the first few laps of the race. The roads are closed only within a few hours of the practice sessions and the race, before being opened again almost as soon as the race is finished. Workers have to assemble and dismantle safety barriers every year for the public sections.

Information from Wikipedia

https://en.wikipedia.org/wiki/24_Hours_of_Le_Mans