mad how much the rear wiper affect downforce so much

His favorite anecdote, though, concerns the rear windscreen wiper. "We were testing at Snetterton circuit and we were way off the pace. We'd tried just about everything so someone suggested that we put the rear windscreen wiper on. The cars went back out and suddenly jumped 10 places to eighth and ninth. The wind tunnel showed that it was worth 3 kg of rear downforce, which just shows how critical this thing is. Of course, we later hollowed out the wiper."

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