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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA fan-assisted car creates downforce by pulling air out from beneath its floor. That lowers pressure under the car relative to the air above it, producing a net force that presses the car toward the road. A floor and skirts help contain the low-pressure area, while the powered fan keeps air moving—even when the car is stationary.
How a fan creates downforce
The fan draws air from a region between the car’s underside and the road. With less pressure beneath the floor than above it, the pressure difference pushes the car downward. The car is not held by a perfect vacuum: air remains in the system, and the fan must keep extracting it for the pressure difference to persist.
The fan, floor and sealing strategy work together. Skirts or other barriers limit outside air leaking into the underbody area; the fan removes air faster than it leaks back in. The result depends on fan operation, underfloor geometry, leakage, ride height and operating conditions.
How it differs from wings and passive ground effect
A wing creates aerodynamic force by deflecting moving air. Passive ground-effect floors use the shape and gap beneath a moving car to manage airflow and pressure. Both rely on airflow generated by the vehicle’s motion. A powered extraction fan can produce useful downforce at very low speed, including from rest, because it actively moves air rather than waiting for road speed to supply it.
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That difference does not make fan systems independent of speed or design in every respect. Their performance still depends on the fan and on how well the underbody controls airflow and leakage. To compare a fan car with a wing-based or passive ground-effect car, consider how much downforce is available at low speed, fan power and packaging, noise and mass, sealing and ride-height control, and the rules for the relevant competition. These are engineering comparison factors, not the results of a controlled comparative test.
The Brabham BT46B: a famous early example
At the 1978 Swedish Grand Prix, Brabham raced the BT46B with a large fan at the rear. Formula 1 describes the fan as intended to generate downforce and cool the car. Niki Lauda drove it to victory; after rival teams protested, owner Bernie Ecclestone voluntarily withdrew the car. That account is more precise than saying it was simply “banned immediately.” Formula 1’s history of unusual F1 innovations and RACER’s retrospective describe the car’s design and its disputed cooling rationale.
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RACER recounts that the wide Alfa Romeo flat-12 engine made it difficult to fit the Venturi tunnels Brabham wanted, and that designer Gordon Murray presented cooling as the fan’s primary function. The episode is a reminder that the fan’s aerodynamic effect and the stated reason for fitting it are distinct parts of the car’s history.
Modern example: McMurtry Spéirling PURE
McMurtry says the production-form Spéirling PURE uses two high-speed fans to draw air through filters from a sealed region beneath the chassis. The manufacturer claims fan speeds of up to 23,000 rpm and downforce of up to 2,000 kg from 0 mph. Those figures are manufacturer specifications, not independently verified measurements in the sources cited here. McMurtry’s production-form announcement describes the system and its claims.
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McMurtry also says the twin fans provide redundancy and that downforce continues in a spin. Its account of an upside-down demonstration describes the car producing enough hold-down force in that demonstration setup; it does not establish that every fan car can operate upside down, or that the same result applies in all conditions. McMurtry’s account of the demonstration and its Spéirling PURE overview provide the manufacturer’s description.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.What the design trades for low-speed downforce
Active extraction requires powered fans and room to package them, as well as an underbody that limits leakage. That adds mechanical and design complexity compared with relying solely on passive aerodynamic surfaces. Practical comparisons should account for fan power, mass, noise, sealing, ride height and competition rules rather than treating low-speed downforce as the only relevant measure.
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The sources cited here do not establish a universal safety margin or a general outcome for fan failure. Those questions depend on the specific system and conditions; a manufacturer’s claim of redundancy is not the same as a quantified independent failure test.
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