McLaren Speedtail Blows Past F1 with 250 MPH Top Speed

The trailing edge of the Speedtail showcases a particular highlight, namely a pair of active rear ailerons. These dynamic elements are hydraulically actuated and an integral part of the rear clamshell, formed in flexible carbon fiber; the body of the Speedtail can quite literally bend. With a tolerance of only 1mm between the surfaces, this dramatic new technology all but removes any gaps or shutlines between the vehicle and the leading edge of the spoilers, meaning there is no turbulent air, no drag and no loss of speed.

Positioned outboard from the center of the Speedtail for optimal aerodynamic performance, the twin active ailerons adjust to move the center of pressure and provide the required level of downforce precisely when it is needed most, for instance under deceleration to provide an airbrake function, while at high speed to increase vehicle stability.

Performing a similar function to that of the lower door vents, the vertical rear blades that are located beyond the trailing edge of the rear fenders draw turbulent air out of the rear wheel arches, away from the 21-inch forged alloy, rear wheels. By reintroducing this ‘dirty’ air into the external environment as smoothly as possible, the base pressure behind the Speedtail is reduced – and so, therefore, is drag.

The rear diffuser of the McLaren Speedtail works in conjunction with the rear blades to reduce base pressure and drag, achieving this through the fluent merger of the airflow from the top and the underside of the vehicle. The extended length of the diffuser and flat underfloor combine to diffuse the airflow before – in conjunction with the extended rear bodywork of the Speedtail – introducing it gradually back into the freestream rather than separating it from the rear of the vehicle with a hard, abrupt edge. The result is a further improvement to aerodynamic drag efficiency.

On the design model produced to herald the next Ultimate Series, the McLaren badge and Speedtail name are formed in 18-carat white gold, with the letters individually pressed, clipped and polished.