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The Fan Car: The Roadster's Suction System Is a 1970 Idea That Got Banned Twice
The Roadster's underbody fans — up to 2 g of suction, a live gauge showing about 4,700 kg of downforce upside down — descend from the Chaparral 2J of 1970 and the Brabham BT46B of 1978, both fan cars, both banned.