After evaluating its experimental rotating rear wing during the Hungarian Grand Prix weekend, the McLaren boss has confirmed that the innovative concept will now progress from trial status to future race appearances on the MCL40. Track data trumps theoryOne notable distinction between McLaren’s version and Ferrari’s design is the direction in which the wing rotates. Some observers have suggested that such differences may be rooted in the characteristics of each team’s wind tunnel, but Stella firmly rejected that theory. “I don’t think the wind tunnel is a major factor in terms of determining the aerodynamic behaviour in reattachment,” he said. “It was important for us to acquire data via trackside because you would have never relied on a wind tunnel only for such a delicate project.”