[Qxkmsxsx]

The device would increase the straightline speed of the car behind by approximately 15km/h to help overtaking, but could not be used on the opening laps of a race. The car in front would not be able to deploy the system in defence, but would be able to retaliate using the wing once it was following the rival car.

"The flap will be adjustable by the driver," Lowe explained during a Vodafone McLaren Mercedes teleconference. "He can run it however he likes in qualifying, so what we'll actually do is make the flap so it has very low drag, and in qualifying that will allow you to get a better laptime by using it wherever you can.

"In the race, you can't use it for the first two laps at all, but after that if you're within a second of the car in front then you will be able to deploy it. http://www.autosport.com/news/report.php/id/84682

Probably safer than persevering with the F-duct. Add that to some less durable tyres and they may be onto something...