McLaren: No double DRS at Spa

McLaren boss Martin Whitmarsh has denied rumours that the team will introduce double DRS at this weekend's Belgian Grand Prix, but left the door open for the appearance of such a device later in the year. There had been speculation that McLaren would become the third Formula 1 team to employ such a system, which gives a straightline speed boost by stalling the airflow over wings. Mercedes pioneered it at the start of the season, before Lotus' version made its debut in German GP practice .

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