The Williams FW33 was the car designed by the Grove-based team, founded by Sir Frank Williams and Sir Patrick Head in 1977, to compete in the 2011 Formula One World Championship. Despite promising technical concepts and several extreme engineering solutions, the FW33 proved to be one of the least competitive cars Williams had ever produced up to that point, prompting a major restructuring of the team's technical management during the season. Indeed, the management, led by Sir Frank Williams and Chief Executive Officer (CEO) Adam Parr, decided that a thorough structural overhaul was necessary, bringing experienced and highly regarded engineers into the organisation.
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| WILLIAMS FW33, Rubens Barrichello Catalunya-Barcelona, Spanish GP 2011 |
At the start of the season, the Grove team's technical staff consisted of Technical Director Sam Michael, responsible for overall technical management, design, and the direction of trackside operations during Grands Prix, as well as serving as the central figure and public face of the team's engineering department; Chief Designer Ed Wood, who led the mechanical design team and was the driving force behind the FW33's extreme packaging; and Head of Aerodynamics Jon Tomlinson, responsible for aerodynamic development and the Grove wind tunnel. Several other key personnel completed the department, including Clive Cooper (Head of Design – Composites and Structures), Christopher Brawn (Head of Design – Suspension, Steering, Brakes), Mark Loasby (Head of Design – Systems), and Xevi Pujolar (Chief Track Engineer). In May 2011, following an unsuccessful start to the season, the team announced a formal restructuring of its technical department. Sam Michael submitted his resignation but remained in his position until the Singapore Grand Prix to ensure a smooth transition. He subsequently joined McLaren for the 2012 season. In an effort to reverse the team's fortunes, Williams recruited three prominent figures. The first was Mike Coughlan, who returned to Formula One following his suspension in connection with the 2007 Spygate scandal, when he had been McLaren's Chief Designer. Coughlan took charge of engineering development, effectively replacing Sam Michael in planning the following year's car, the FW34. Jason Somerville, a former Renault/Lotus aerodynamicist, arrived to replace Tomlinson and completely rebuild the aerodynamic department at Grove. Mark Gillan, a former Jaguar, Renault, and Toyota engineer, was appointed Chief Operations Engineer, with responsibility for trackside operations and for coordinating the relationship between the factory and race weekends.
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| WILLIAMS FW33, Rubens Barrichello Montecarlo, Monaco GP 2011 |
The Williams FW33 was unveiled on 1 February 2011 at the Ricardo Tormo Circuit in Valencia, Spain, immediately attracting attention for its rear end, described by the specialist press as “the most extreme on the grid”. The Grove engineers had chosen to sacrifice conventional mechanical design in pursuit of aerodynamic efficiency. To maximise the volume of airflow passing through the rear section, which narrowed tightly around the engine, Williams designed an exceptionally low and short gearbox casing made from aluminium and carbon fibre. The differential was positioned unusually low, while the driveshafts operated at pronounced angles, creating steep joint angles. This was a risky solution in terms of mechanical durability, but offered significant aerodynamic advantages. At the rear, the conventional push-rod suspension system was abandoned in favour of a pull-rod arrangement, with the pull rods and dampers positioned low in the chassis. This lowered the centre of gravity and left the upper part of the rear end almost entirely free of physical obstructions. The upper rear suspension wishbones were not attached to the gearbox casing but instead connected directly to the single central support pillar of the rear wing. The purpose of this extreme mechanical packaging was to preserve a large volume of undisturbed, high-energy airflow over the diffuser ramp and towards the rear wing's lower element, known as the beam wing, thereby improving the overall efficiency of airflow extraction from beneath the monocoque. The high, flat nose was specifically designed to direct as much air as possible towards the underfloor and, consequently, the rear diffuser. The same principle informed the two-element front wing. Vertical bargeboards and heavily undercut sidepods also channelled airflow towards the rear of the car and the beam wing.
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| WILLIAMS FW33, Pastor Maldonado Sepang, Malaysian GP 2011 |
Although the FW33's mechanical architecture was reasonably sound, its principal weakness lay in its inability to integrate an effective blown-exhaust system into the overall aerodynamic package. In 2011, teams such as Red Bull dominated by using exhaust gases from their V8 engines to blow directly onto the underfloor and the diffuser's sidewalls. This created a kind of aerodynamic seal, effectively forming an “air skirt” beneath the car and generating substantial downforce even at low speeds. The Cosworth CA2011K V8 engine used by Williams lacked the sophisticated engine-management software found in Renault and Ferrari power units, which could continue injecting and burning fuel to maintain a flow of hot exhaust gases even when the driver lifted off the accelerator. This technique became known as off-throttle blowing, or hot blowing. As a result, Williams experimented with several exhaust configurations throughout the year. Initially, the team used a high-mounted exhaust layout, directing the gases towards the beam wing. However, this arrangement failed to create an aerodynamic seal along the diffuser's sides. Williams subsequently experimented with low-mounted exhausts positioned along the floor, attempting to imitate Red Bull by directing the gases into the gap between the inner shoulder of the rear tyre and the diffuser edge. The aim was to counteract the turbulence generated by the rotating tyres, a phenomenon known as tyre squirt. However, because the rear section was extremely tightly packaged and offered little room for heat dissipation, the exhaust gases repeatedly damaged the carbon-fibre panels forming the floor and diffuser. This caused sudden losses of aerodynamic downforce under braking and through the middle of corners. The combined effect of these problems was a car that proved exceptionally difficult to drive and set up, with a highly inconsistent aerodynamic platform. Whenever the car rolled through corners or pitched under braking and acceleration, the airflow at the rear could detach abruptly, triggering sudden oversteer in the middle of a corner. The new Pirelli tyres introduced for 2011 were particularly susceptible to thermal degradation. Without consistent aerodynamic downforce, the FW33's rear tyres slid excessively, overheating and losing performance after only a handful of laps. The movable rear wing, although effective on the straights when the Drag Reduction System (DRS) was activated, was unable to compensate for the car's poor overall balance under braking, making it particularly unstable.
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| WILLIAMS FW33, Rubens Barrichello Monza, Italian GP 2011 |
For the 2011 season, the Grove team retained experienced Brazilian driver Rubens Barrichello and paired him with Venezuelan newcomer Pastor Maldonado, who had recently won the 2010 GP2 Series title. Unfortunately, 2011 proved to be one of the darkest and most challenging periods in Williams' illustrious competitive history. Despite its bold and extreme rear-end engineering, the FW33 was a notoriously difficult car to operate within its optimal performance window, delivering a level of competitiveness far below expectations. At the opening two Grands Prix in Australia and Malaysia, both cars retired because of mechanical failures and problems involving the transmission and Cosworth engine. After the first five races, Williams had failed to score a single point and had already fallen towards the bottom of the championship standings. The team's few bright moments came in May and June, when Barrichello secured ninth-place finishes in Monaco and Montreal. While rival teams made rapid progress in developing their blown-exhaust aerodynamic systems, Williams remained trapped in a period of stagnation. It was only in the heavy rain at Spa-Francorchamps that Maldonado managed to finish tenth, scoring the first World Championship point of his career. During the final seven races of the season, the FW33 slipped back towards the lower reaches of the standings. Sam Michael's announced departure and the restructuring of the technical department quickly shifted the factory's resources and attention towards the 2012 car. The final results made for grim reading: Williams finished ninth in the Constructors' Championship, scoring just five points across 19 races. This was the team's worst overall result since 1978. The FW33 demonstrated that, in Formula One at the time, simply streamlining airflow through extreme mechanical packaging was not enough. Without the ability to control the energy of exhaust-gas flows and manage their dynamic interaction with the tyres, even the most radical aerodynamic concepts could not deliver the desired performance.
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