F1 aerodynamics and regulations explained, 1961–2026
How Formula 1's rules shaped the cars over 66 seasons: wings, sidepods, floors, ground effect, DRS, the halo, weight and width limits, engines and the 2026 active-aero cars. Every figure links to its source.
The 2026 cars are shorter, narrower and lighter. The maximum wheelbase drops by 200 mm to 3,400 mm and the width by 100 mm to 1,900 mm. The front wing is 100 mm narrower, tyres are 25 mm (front) and 30 mm (rear) narrower, and the FIA's minimum weight is 768 kg, though several teams quote 770 kg. Both wings now have movable flaps: Corner Mode keeps them closed for downforce and Straight Mode opens them to cut drag. Downforce falls by about 30% and drag by about 55%. The power unit loses the MGU-H, the MGU-K rises from 120 kW to 350 kW for a roughly 50/50 split between combustion and electric power, and the fuel is 100% sustainable.
DRS (Drag Reduction System) is a flap in the rear wing that a driver can open in set zones on the straights when within one second of the car ahead. Opening it cuts drag and adds top speed to help overtaking. It was introduced in 2011, the year after McLaren's driver-operated F-duct was banned. From 2026 every car opens both wings on the straights in Straight Mode, so DRS is replaced by Overtake Mode: extra electrical energy for a driver within one second of the car ahead.
Ground effect means using the car's underside as an upside-down wing. Air speeds up through the gap between the floor and the track, its pressure drops and the car is sucked down. Lotus started it with the 78 in 1977, sealing the sides of shaped sidepods with sliding skirts. Skirts were banned for 1981 and the flat-bottom rule ended it for 1983. It returned in 2022 with two long Venturi tunnels in the floor. In simulation, a car following one car length behind keeps 86% of its downforce, against 55% with the previous rules.
Porpoising is the bouncing that ground-effect cars can suffer at high speed. As the floor gets closer to the track it makes more downforce and is pulled lower, until the airflow under it stalls. The downforce then drops suddenly, the car rises, the flow reattaches and the cycle repeats. It hit many cars when ground effect returned in 2022; Mercedes' 'zeropod' W13 struggled with it and won only one race.
What was the Williams FW14B, and when was active suspension banned?
The FW14B was Williams' 1992 car. Its computer-controlled hydraulic active suspension held the ride height constant, so the floor and wings always worked at their best. It also had traction control and a semi-automatic gearbox. It won 10 races and both championships, with Nigel Mansell taking the drivers' title. Active suspension, traction control and ABS were all banned from 1994.
The 2009 rules cut back the diffuser at the back of the floor. Brawn GP found a loophole: an extra upper channel fed through a gap in the floor step, which gave it a second, 'double' diffuser. Rivals protested, it was ruled legal on appeal, and Brawn won both championships in its only season.
After the deaths of Roland Ratzenberger and Ayrton Senna at Imola in 1994, a 10 mm plank was fixed under every car to stop teams running them too close to the ground. Only 1 mm of wear is allowed, so a car run too low wears the plank and can be disqualified. For 1995 the floor also became stepped, which cut underbody downforce by up to 50%.
The rules set a minimum weight, not a maximum. It was 450 kg in 1961, 500 kg in 1966 and 575 kg from 1973. Hybrid power units and safety structures pushed it up: 728 kg in 2017, 798 kg in 2023–24 and 800 kg in 2025. For 2026 it comes down to 768 kg (FIA figure; several teams quote 770 kg).
The maximum width has changed several times. A width limit first appeared at the 1976 Spanish Grand Prix, where James Hunt's McLaren was disqualified for being 1.5 cm too wide, then reinstated. Cars were cut to 200 cm in 1993 and to 180 cm in 1998, widened back to 200 cm in 2017, and are 190 cm wide from 2026.
They are the two motor-generators of the hybrid power units used since 2014. The MGU-K is connected to the crankshaft: it recovers energy under braking and gives it back as up to 120 kW of extra power (350 kW from 2026). The MGU-H is connected to the turbocharger and recovers energy from the exhaust. It is not part of the 2026 power units.
In 1968 teams began fitting wings on tall struts that pushed straight down on the wheel uprights. At the 1969 Spanish Grand Prix both works Lotuses crashed when their high wings failed. High wings were banned from the next race, at Monaco, and from then on wings had to be fixed to the sprung part of the car and could not move.
From 1998 to 2008 slick tyres were banned to slow the cars. Tyres had 14 mm grooves, three on the front and four on the rear in 1998, and four on the front from 1999, leaving about 12% less rubber on the road. Slicks returned in 2009.
Each era below lists the key rules with their sources, the engine formula, the main changes by year and the landmark cars. Where sources give different figures, both are shown.
1961–1965 1.5-litre formula
The new 1.5-litre formula replaced the 2.5-litre cars. Engines sat behind the driver, bodies were slim cigar shapes, and nothing on the car made deliberate downforce. Lotus moved the chassis from a tube frame to a monocoque in 1962.
Engines: 1.5-litre atmospheric engines, mostly V6 and V8. Ferrari's 1961 156 made about 190 hp at 9,500 rpm and weighed 460 kg; the 1965 Lotus 33 made about 215 hp at 10,800 rpm at 450 kg.[11]
Changes by year and landmark cars
1961 1.5-litre formula starts; minimum weight 450 kg[11]
1962 Lotus 25 brings the stressed aluminium monocoque
1963 Pump fuel only, roll bar and double braking system required[11]
1961 Ferrari 156: Shark-nose 120° V6 car that won the 1961 title with Phil Hill.
1962 Lotus 25: First successful monocoque F1 chassis: a stiffer, lighter, slimmer tub than a tube frame.
Engine capacity doubled to 3.0 litres. Bodies stayed cigar-shaped and wingless, but tyres grew wider to cope with the power. In 1967 the Lotus 49 bolted the Cosworth DFV straight to the monocoque so the engine carried the rear suspension loads.
Key rules, 1966–1967
Engine
3000 cc atmospheric or 1500 cc supercharged[11][10]
Engines: 3.0-litre atmospheric (or 1.5 supercharged). The Cosworth DFV V8 arrived in 1967 and became the engine most teams bought for the next 15 years.[10]
Teams turned aircraft wings upside down to push the tyres into the road. Rear wings were mounted on tall struts straight onto the suspension uprights. After both works Lotuses crashed when their high wings failed at the 1969 Spanish GP, the governing body banned high wings at Monaco and required wings to be fixed to the sprung part of the car.
Radiators moved from the nose into sidepods beside the driver. That freed the nose to become a low wedge and pushed weight towards the middle of the car. Tall airboxes rammed air into the engine above the driver's head. Rear wings sat low on the gearbox.
Key rules, 1970–1975
Minimum weight
530 kg (1970–71), 550 kg (1972), 575 kg (from 1973)[12][9]
From the 1976 Spanish GP the tall airboxes went and a maximum width came in. James Hunt's McLaren was disqualified at that race for being 1.5 cm too wide, then reinstated. Overhangs were tightened: front ≤ 120 cm, rear wing ≤ 80 cm behind the rear axle. Tyrrell ran six wheels to cut frontal area.
Lotus shaped the underside of the sidepods like an upside-down wing and sealed the sides with skirts, so the whole car became a wing running in ground effect. Downforce jumped and cornering speeds with it. Brabham sucked air out from under its car with a fan. Skirts were banned for 1981 with a 6 cm ground clearance rule, but teams lowered cars on track to get round it.
Key rules, 1977–1982
Minimum weight
575 kg (1980), 585 kg (1981), 580 kg (1982)[9][13]
Ground effect was cut off by rule: the floor between the tyres had to be flat and skirts were gone. Teams got the load back with huge rear wings and short dart-shaped sidepods. Turbo engines took over, then were throttled with boost and fuel limits.
Key rules, 1983–1988
Floor
Flat between the inside of the tyres; no skirts[8][13]
Rear wing
Width 100 cm (from 110), overhang 60 cm (from 80), height up to 100 cm[15]
Minimum weight
540 kg (1983–86), 500 kg (1987), 540 kg turbo (1988)[9][13]
Fuel per race
220 L (1984–85), 195 L (1986–87), 150 L turbo (1988)[9][13]sources disagree
Engines: 1.5-litre turbo V6 and four-cylinder engines. 1986 was turbo-only; 3.5-litre atmospheric engines returned as an option in 1987 while the turbos were choked by boost and fuel limits.[10][13]
Changes by year and landmark cars
1983 Flat bottom, skirts banned; rear wing 100 cm wide, 60 cm overhang[8][15]
Turbos were banned. Noses rose from 1990 so air could reach the floor, and electronics took over: Williams' active suspension held the car at a constant ride height so the floor worked all the time. Cars got narrower and tyres smaller for 1993.
Key rules, 1989–1993
Engine
3500 cc atmospheric, 8–12 cylinders; turbos banned[9][10][13]
Active suspension, traction control and ABS were banned for 1994. After the deaths of Ratzenberger and Senna at Imola, downforce was cut mid-season and a 10 mm plank was fixed under every car to stop them running too low. For 1995 the floor became stepped and engines dropped to 3.0 litres.
Key rules, 1994–1997
Driver aids (1994)
Active suspension, traction control, ABS, power brakes banned[14][20]
Plank (1994)
10 mm under the floor; only 1 mm wear allowed[7][9]
Cars were narrowed by 20 cm and slick tyres were replaced with grooved tyres to cut grip. Aerodynamicists answered with bargeboards, turning vanes and more and more winglets. V10s gave way to 2.4-litre V8s in 2006.
A clean-sheet aero package meant to let cars follow: a wide, low front wing, a tall and narrow rear wing, no bargeboards or winglets, and slicks back. Brawn's double diffuser exploited a loophole and won the title. Refuelling was banned from 2010, so cars got about 22 cm longer, and DRS arrived in 2011.
Key rules, 2009–2013
Front wing
1800 mm wide (from 1400); lowest height 75 mm (from 150), one source says 50 mm[5][9][15]sources disagree
Rear wing
750 mm wide (from 1000), 150 mm higher: 950 mm (from 800)[5][9][15]
The V8s were replaced by 1.6-litre turbocharged V6 hybrids with two motor-generators: the MGU-K on the crankshaft and the MGU-H on the turbo. Noses were forced low for safety and the front wing was narrowed.
The rules turned towards more speed: cars 20 cm wider, much fatter tyres, a wider front wing, a lower and wider rear wing and a bigger diffuser. The halo became mandatory in 2018. Front wings were simplified and widened again in 2019.
For the first time since 1982, the floor is shaped into two long Venturi tunnels that make most of the downforce. Wings were simplified so the car leaves cleaner air behind it: in simulation a following car keeps 86% of its downforce one car length back, against 55% before. Wheels grew to 18 inches.
Key rules, 2022–2025
Floor
Two Venturi tunnels replace the flat floor[17][20]
Shorter, narrower and lighter cars with movable front and rear wing flaps. Corner Mode keeps the flaps closed for downforce; Straight Mode opens them on the straights to cut drag. Downforce is down about 30% and drag about 55%. The MGU-H is gone, the MGU-K nearly triples to 350 kW, and DRS is replaced by an Overtake Mode energy boost.
Engines: 1.6 L V6 turbo with MGU-K raised from 120 kW to 350 kW, MGU-H removed, roughly 50/50 combustion/electric power, 100% sustainable fuel. Up to 8.5 MJ recovered per lap. Overtake Mode adds energy when within one second of the car ahead.[1][10][2]
Changes by year and landmark cars
2026 New chassis, active aero and power unit rules; 11 teams with Cadillac joining[1][2]
2026 Cadillac —: New eleventh team on the grid.
2026 Audi —: Takes over Sauber with its own power unit.
Active suspension and traction control were legal.
What the team did
Computer-controlled hydraulic active suspension kept the ride height constant so the floor and wings always worked at their best, plus traction control and a semi-automatic gearbox.