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Ground effect is an aerodynamic effect used in car design, which has been exploited to create downforce, particularly in racing cars. Three different styles of front wings from three different Formula 1 eras, all designed to produce downforce on the front wheels. ...
Theory It is currently used in Champ Cars, but is heavily limited in Formula One by constraints on the design of the cars, although future rules of lengthier chassis may lead to the reintroduction of major ground effect cars. Champcar has been the name for the class of cars used in the United States premier open wheel auto racing series for decades. ...
Formula One - Wikipedia, the free encyclopedia /**/ @import /skins-1. ...
In racing cars, a designer's aim is not for increased lift but for increased downforce, allowing greater cornering speeds. (By the 1970s 'wings', or inverted aerofoils, were routinely used in the design of racing cars to increase downforce, but this is not ground effect.) This kind of ground effect is easily illustrated by taking a tarpaulin out on a windy day and holding it close to the ground, it can be observed that when close enough to the ground the tarp will suddenly be sucked towards the ground. The 1970s decade refers to the years from 1970 to 1979, also called The Seventies. ...
An airfoil (or aerofoil in British English) is a specially shaped cross-section of a wing or blade, used to provide lift or downforce, depending on its application. ...
A tarpaulin or tarp (also known as hootchie) is a large sheet of strong, flexible, water resistant or waterproof material, often cloth such as canvas coated with plastic or latex. ...
However, substantial further downforce is available by understanding the ground to be part of the aerodynamic system in question. The basic idea is to create an area of low pressure underneath the car, so that the higher pressure above the car will apply a downward force. Naturally, to maximize the force one wants the maximal area at the minimal pressure. Racing car designers have achieved low pressure in two ways: first, by using a fan to pull air out of the cavity; second, to design the underside of the car so that large amounts of incoming air are accelerated through a narrow slot between the car and the ground, lowering pressure by Bernoulli's principle. Official regulations as of 2006 severely limit ground effects in many types of racing, such as Formula One although it is exploited more freely in Champ cars. This article is about pressure in the physical sciences. ...
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2006 is a common year starting on Sunday of the Gregorian calendar. ...
Formula One - Wikipedia, the free encyclopedia /**/ @import /skins-1. ...
Champcar has been the name for the class of cars used in the United States premier open wheel auto racing series for decades. ...
Jim Hall, the first car aerodynamicist to harness ground effect, built Chaparral cars to both these principles. His 1961 car attempted to use the shaped underside method but there were too many other aerodynamic problems with the car for it to work properly. His 1966 cars used a dramatic high wing for their downforce. His Chaparral 2J "sucker car" of 1970 was revolutionary. It had two fans at the rear of the car driven by a dedicated two-stroke engine; it also had "skirts", which left only a minimal gap between car and ground, so as to seal the cavity from the atmosphere. Although it did not quite win a race, the competition lobbied for its ban, which came into place at the end of that year. Movable aerodynamic devices were banned from most branches of the sport.[1] Jim Hall was a Formula One driver from the United States. ...
Joakim Bonnier 1966 in the Chaparral during practice at the Nürburgring Mike Spence 1967 in the Chaparral 2F during practice at the Nürburgring Chaparral Cars was a United States automotive company which built prototype race cars from the 1960s through the early 1980s. ...
The two-stroke cycle of an internal combustion engine differs from the more common four-stroke cycle by having only two strokes (linear movements of the piston) instead of four, although the same four operations (intake, compression, power, exhaust) still occur. ...
Formula One was the next setting for ground effect in racing cars. Several Formula One designs came close to the ground effect solution which would eventually be implemented by Lotus. In 1968 and 1969, Tony Rudd and Peter Wright at British Racing Motors (BRM) experimented on track and in the wind tunnel with long aerodynamic section side panniers to clean up the turbulent airflow between the front and rear wheels. Both left the team shortly after and the idea was not taken further. Robin Herd at March Engineering, on a suggestion from Wright, used a similar concept on the 1970 March Formula One car. In both cars the sidepods were too far away from the ground for significant ground effect to be generated, and the idea of sealing the space under the wing section to the ground had not yet been developed.[1] Formula One - Wikipedia, the free encyclopedia /**/ @import /skins-1. ...
British Racing Motors (generally known as BRM) was a British Formula 1 motor racing team. ...
March Engineering was a Formula One constructor from Britain. ...
On a different tack, Brabham designer Gordon Murray used air dams at the front of his Brabham BT44s in 1974 to exclude air from flowing under the vehicle. On discovering that these tended to wear away with the pitching movement of the car, he placed them further back and discovered that a small area of negative pressure was formed under the car, generating a useful amount of downforce - around 150lbs. McLaren produced similar underbody details for their McLaren M23 design.[1] Carlos Reutemann in the all-white Brabham BT44 at the 1974 Race of Champions The Brabham BT44 was an F1 car designed by Gordon Murray, Brabhams chief designer. ...
 Brabham's BT46B used a large fan to reduce underbody air pressure. In 1977 Rudd and Wright, now at Lotus, developed the Lotus 78 'wing car', based on a concept from Lotus owner and designer Colin Chapman. Its sidepods, bulky constructions between front and rear wheels, were shaped as inverted aerofoils and sealed with flexible "skirts" to the ground. The design of the radiators, embedded into the sidepods, was partly based on that of the De Havilland Mosquito.[2] The team won 5 races that year, and 2 in 1978 while they developed the much improved Lotus 79. The most notable contender in 1978 was the Brabham BT46B Fancar, designed by Gordon Murray. Its fan, spinning on a horizontal, longitudinal axis at the back of the car, took its power from the main gearbox. The car avoided the sporting ban by claims that the fan's main purpose was for engine cooling as less than 50% of the airflow was used to create a depression under the car . It raced just once, with Niki Lauda winning at the Swedish Grand Prix. An example of the supreme advantage this provided was shown by the way that as Lauda was approaching another car to pass, there was an oil slick on the track. While the other car had to slow down, Lauda simply accelerated over it as the fan was powered by the gearbox, thus the higher the speed the higher the grip (which is very similar to modern day F1 cars).[3] Brabham's owner, Bernie Ecclestone, who had recently become president of the Formula One Constructors Association, reached an agreement with other teams to withdraw the car after three races. However, motor sport's world governing body, the Fédération Internationale de l'Automobile (FIA) decided to ban 'fan cars' with almost immediate effect.[4] The Lotus 79, on the other hand, went on to win 6 races and the world championship for Mario Andretti and gave team-mate Ronnie Peterson a posthumous second place, demonstrating just how much of an advantage the cars had. In following years other teams copied and improved on the Lotus until cornering speeds became dangerously high, resulting in several severe accidents in 1982 (most notably the death of Gilles Villeneuve), flat undersides became mandatory for 1983.[5] Part of the danger of relying on ground effects to corner at high speeds is the possibility of the sudden removal of this force; if the belly of the car contacts the ground, the flow is constricted too much, resulting in almost total loss of any ground effects. If this occurs in a corner where the driver is relying on this force to stay on the track, its sudden removal can cause the car to abruptly lose most of its traction and skid off the track. Image File history File linksMetadata Download high resolution version (836x584, 99 KB) This image is licensed under the Creative Commons Attribution License v. ...
Image File history File linksMetadata Download high resolution version (836x584, 99 KB) This image is licensed under the Creative Commons Attribution License v. ...
The Lotus 78 wing car was the car that started the ground effect revolution in Formula 1, in the 1977 racing season. ...
Team Lotus was one of Formula 1s most successful teams. ...
Anthony Colin Bruce Chapman (19 May 1928 - 16 December 1982)[1] was an influential British designer, inventor, and builder in the automotive industry. ...
The de Havilland Mosquito[1] was a British combat aircraft that excelled in a number of roles during the Second World War. ...
Lotus 79 at the 2006 Goodwood Festival of Speed The Lotus 79 was a Formula 1 car designed in late 1977 by Colin Chapman, Martin Ogilvie, Tony Rudd and Peter Wright of Lotus. ...
Brabham - Wikipedia, the free encyclopedia /**/ @import /skins-1. ...
The Brabham BT46 was a Formula One racing car, designed by Gordon Murray for the Brabham team, owned by Bernie Ecclestone, for the 1978 Formula One season. ...
Gordon Murray (born 1946 in Durban, South Africa) is a renowned designer of Formula 1 race cars and the McLaren F1 roadcar. ...
Andreas Nikolaus Niki Lauda (born February 22, 1949 in Vienna) is an Austrian aviator, entrepreneur, former Formula One (F1) racing driver and three-time F1 World Champion. ...
Bernard Charles Bernie Ecclestone (born October 22, 1930 near Bungay, Suffolk, England) is the president and CEO of Formula One Management and Formula One Administration, and owns a stake in Alpha Prema, the parent company of the Formula One Group of companies. ...
The Formula One Constructors Association (FOCA) is an organization of the chassis builders (constructors) who design and build the cars that race in the Formula One Grands Prix. ...
The Fédération Internationale de lAutomobile, commonly referred to as the FIA, is a non-profit association established on June 20, 1904 to represent the interest of motoring organisations and motor car users. ...
Mario Gabriele Andretti (born February 28, 1940 in Montona dIstria, Italy, now Motovun, Croatia) is an Italian American racing driver, and one of the most successful Americans in the history of auto racing. ...
Bengt Ronnie Peterson, (IPA: , February 14, 1944 - September 11, 1978) was a Swedish racing driver. ...
Joseph Gilles Henri Villeneuve (Gilles Villeneuve pronounced []) (January 18, 1950 – May 8, 1982) was a Canadian Formula One racing driver. ...
The effect is still used in its most effective form in current Champ Car designs. Racing series based in Europe have mainly followed the lead of Formula One and mandated flat undersides for their cars. This heavily constrains the degree to which ground effect can be generated. Nonetheless, as of 2007, Formula One cars still generate a proportion of their overall downforce by this effect, vortices generated at the front of the car are used to seal the gap between the sidepods and the track and a small diffuser is permitted behind the rear wheel centerline to re-accelerate the high speed underbody airflow to free flow conditions. High nose designs, starting with the Tyrrell 019 of 1990, optimize the airflow conditions at the front of the car.[citation needed] “CART†redirects here. ...
Vortex created by the passage of an aircraft wing, revealed by coloured smoke A vortex (pl. ...
The Tyrrell 019 was a Formula One racing car, designed by a team led by Harvey Postlethwaite, and built by Tyrrell. ...
Note that while such downforce-producing aerodynamic techniques are often referred to with the catch-all term "ground effect", they are not strictly speaking a result of the same aerodynamic phenomenon as the ground effect which is apparent in aircraft at very low altitudes. A 1994 Toyota Supra with ground effects. ...
Altitude is the elevation of an object from a known level or datum. ...
Porpoising Porpoising is a term that was commonly used to describe a particular fault encountered in ground effect racing cars.
Racing cars had only been using their bodywork to generate downforce for just over a decade when Colin Chapman's Lotus 78 and 79 cars demonstrated that ground effect was the way to go in Formula 1, so naturally at this point under-car aerodynamics were still very poorly understood. To compound this problem the teams that were keenest to pursue ground effects tended to be the more poorly-funded British "garagiste" teams, who had little money to spare for wind tunnel testing and tended simply to mimic the front-running Lotuses. Anthony Colin Bruce Chapman (19 May 1928 - 16 December 1982)[1] was an influential British designer, inventor, and builder in the automotive industry. ...
The Lotus 78 wing car was the car that started the ground effect revolution in Formula 1, in the 1977 racing season. ...
Lotus 79 at the 2006 Goodwood Festival of Speed The Lotus 79 was a Formula 1 car designed in late 1977 by Colin Chapman, Martin Ogilvie, Tony Rudd and Peter Wright of Lotus. ...
Formula One, abbreviated to F1 and also known as Grand Prix racing, is the highest class of single-seat open-wheel auto racing. ...
This led to a generation of cars that were designed as much by hunch as by any great knowledge of the finer details, making them extremely pitch sensitive. As the centre of pressure on the sidepod aerofoils moved about depending on the car's speed, attitude and ground clearance, these forces interacted with the car's suspension systems and cars began to resonate, particularly at slow speeds, rocking back and forth - sometimes quite violently. Some drivers were even known to complain of sea-sickness... This back-and-forth rocking motion, like a porpoise diving into and out of the sea as it swims along at speed, is what gives the phenomenon its name. Genera Neophocaena Phocoena - Harbor porpoise Phocoenoides - Dalls porpoise The porpoises are small cetaceans of the family Phocoenidae; they are related to whales and dolphins. ...
Ground effects were largely banned from Formula 1 in the early 1980s, but Group C sportscars and other racing cars continued to suffer from porpoising until gradually better knowledge of ground effects allowed designers to minimise the problem.
See also Automotive aerodynamics is the study of the aerodynamics of road vehicles. ...
A Venturi meter is shown in a diagram, the pressure in 1 conditions is higher than 2, and the relationship between the fluid speed in 2 and 1 respectively, is the same as for pressure. ...
A 1994 Toyota Supra with ground effects. ...
Aircraft may be affected by a number of ground effects, aerodynamic effects due to a flying bodys proximity to the ground. ...
A modern Formula One car is a single-seat, open cockpit, open wheel race car with substantial front and rear wings, and engine positioned behind the driver. ...
References - Henry, Alan (1985), Brabham, the Grand Prix Cars, Osprey, ISBN 0-905138-36-8
- Nye, Doug (1985), Autocourse History of the Grand Prix car 1966 - 1985, Hazleton publishing, ISBN 0-905-138-37-6
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