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Ducted-fan design could add downforce to a Roadster at low speeds

Teslarati describes a design typically shown with four rear fans powered by a vehicle’s battery. They would draw air from beneath the car and expel it through a larger rear outlet, which the patent says could cut drag.

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2 Sources, 10d ago, first seen 10d ago

TLDR

Teslarati describes a ducted-fan design that would speed up airflow beneath a car to add downforce, even at speeds where conventional aerodynamics produce little force. Teslarati says that, on a high-power Roadster, the added grip could help at launch and in slow corners. The patent says the expanding rear outlet could cut drag.

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2 Sources, first seen 10d ago

187 likes27 comments12 saves7 reposts

Combined views

70K

2 Sources, first seen 10d ago

187 likes27 comments12 saves7 reposts

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2 Sources

TESLARATI@Teslarati🚨 The design uses electrically driven ducted fans, typically shown as a row of four at the rear, powered by the vehicle’s high-voltage battery. The fans pull air from an underbody inlet, route it through ducts, and expel it from a larger rear outlet that functions as a diffuser. Faster flow under the floor lowers pressure there, pressing the car onto the road and adding downforce even at low speed, where conventional wings and underbody aero produce little force. The expanding rear outlet also slows and re-integrates the exhaust air, which the patent says can cut drag rather than add it. On a high-power Roadster, that combination would matter most at launch and in slow corners, where electric motors can deliver peak torque before passive aero has any airspeed to work with. Extra downforce would increase tire load for harder acceleration, braking, and turn-in, while the diffuser-style exhaust is meant to keep drag from rising as speed builds, which would help both top-end stability and efficiency. Adjustable fan output would also let the car add grip only when needed instead of carrying a fixed aero penalty on the highway.10d
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    2 Sources

    TESLARATI@Teslarati🚨 The design uses electrically driven ducted fans, typically shown as a row of four at the rear, powered by the vehicle’s high-voltage battery. The fans pull air from an underbody inlet, route it through ducts, and expel it from a larger rear outlet that functions as a diffuser. Faster flow under the floor lowers pressure there, pressing the car onto the road and adding downforce even at low speed, where conventional wings and underbody aero produce little force. The expanding rear outlet also slows and re-integrates the exhaust air, which the patent says can cut drag rather than add it. On a high-power Roadster, that combination would matter most at launch and in slow corners, where electric motors can deliver peak torque before passive aero has any airspeed to work with. Extra downforce would increase tire load for harder acceleration, braking, and turn-in, while the diffuser-style exhaust is meant to keep drag from rising as speed builds, which would help both top-end stability and efficiency. Adjustable fan output would also let the car add grip only when needed instead of carrying a fixed aero penalty on the highway.10d
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