Tesla Roadster Patent Details Active Aerodynamic Fans for High-Speed Stability
The newly granted patent describes electrically driven ducted fans designed to generate downforce independent of vehicle speed.
Tesla has been granted a patent for an electric car fan system intended to maintain downforce for the upcoming Roadster at low speeds and during acceleration, addressing limitations in passive aerodynamic designs.
What Happened
The patent, titled "Electric Car Fan," was granted on September 29, approximately two weeks before the Roadster’s anticipated unveiling event. The design features a package of four axial fans located in the rear diffuser, powered by the vehicle’s high-voltage battery. These fans draw air from an underbody inlet situated between the rear wheels and expel it through a wider rear outlet. The system is controlled by a vehicle control module that allows for modulation of fan speed, ensuring the hardware does not create excessive drag at highway velocities. The filing claims this configuration can increase downforce while simultaneously reducing aerodynamic drag.
Why It Matters
This technology targets a specific challenge in high-performance electric vehicles: conventional wings and underbody tunnels rely on airspeed to generate downforce, offering minimal grip during launches, slow corners, or hard braking from modest speeds. By using active fans, Tesla aims to provide tire load and stability independent of vehicle velocity. This could enhance acceleration rates, decrease stopping distances, and improve turn-in sharpness. The concept echoes the Brabham BT46B, a Formula 1 car banned for using a similar fan system deemed too effective. For the Roadster, which Tesla lists with a sub-two-second 0-60 mph time and a 250-plus-mph top speed, active aerodynamics may be necessary to manage instant motor torque without relying solely on passive components.
The Bottom Line
While the patent suggests a sophisticated approach to active aerodynamics, it does not guarantee production inclusion. Tesla must still address practical concerns such as noise management, debris handling, and component packaging. The system remains a proposed solution to balance high-speed stability with low-speed grip for the upcoming model.
