The FW28 is the first car to fully benefit from the recently improved WilliamsF1 aerodynamic facilities, including two full time, on site wind tunnels. The car uses a zero keel chassis concept, developed to improve the aerodynamic efficiency of the car. The change in FIA aerodynamic regulations at the front of the car was a significant input to the development of the FW28 chassis.
With a reduction in power (as the engine has dropped from a 3.0l v10 to a 2.4l v8), a higher aerodynamic efficiency is required. This is the main reason for the FW28 rear wing design and the disappearance of less efficient components such as rear light wings and secondary roll hoop wings.
Cars are rebuilt between every Grand Prix. This involves full strip down and servicing of the fuel system, hydraulics, steering, gearbox and electrical systems. In addition to this, all the composite and metallic parts are inspected and crack checked for damage.
It takes two days to build an FW28 from a bare chassis to a fully rolling car.