Tesla Patent Details Fan System for Increased Vehicle Downforce

Tesla has been granted a patent for an active aerodynamic system that uses battery-powered fans to increase downforce and reduce drag, a technology potentially intended for the upcoming Roadster.

What Happened

The patent, granted this morning, outlines a system that draws air through an inlet beneath the vehicle, moves it through a duct, and expels it from a larger rear outlet. This widening passage acts as a diffuser, allowing air to expand and slow down, which creates a lower-pressure area under the floor. The diagram in the patent features four electric fans positioned side-by-side, separated by vertical fins known as strakes to manage airflow. Tesla filed the application on January 17, 2024, following a provisional filing on January 17, 2023.

Why It Matters

Unlike passive aerodynamic devices that rely on vehicle speed to generate downforce, Tesla’s proposed fan system operates independently of speed. This allows the system to provide increased cornering grip and braking stability even at lower velocities, where traditional spoilers and underbody vents are less effective. The system is described as activating automatically when specific conditions, such as speed thresholds, are met. Given the Roadster’s expected high-performance characteristics, including optional gas thrusters, this technology could address aerodynamic challenges at both low and high speeds.

The Bottom Line

With Tesla’s Roadster event scheduled for October 15, this patent suggests a mechanical approach to aerodynamics distinct from the active wings seen in previous testing. The system aims to enhance vehicle stability and grip by actively managing underbody pressure through fan-driven airflow.