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Off-throttle blowing: Why it's being banned

Former Jordan, Stewart and Jaguar F1 designer Gary Anderson examines the reasons for the change in regulations governing off-throttle blowing of diffusers in time for this weekend's British Grand Prix.

The subject of diffusers has come up time and again in Formula 1 since the last radical overhaul of the sport's technical regulations took effect at the start of 2009.

First there were the double diffusers, widely reported to be the main cause of Brawn's title success that year; then there were blown diffusers, and now it is specifically the act of off-throttle blowing of the items that is making headlines.

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