Apr.6 (GMM) Engineers still do not know how to emulate Red Bull's flexible front wing, according to Germany's Auto Motor und Sport.

After Melbourne, McLaren's Lewis Hamilton warned that the FIA should either move to ban the RB7's legally-bending wing extremities, or Red Bull's rivals will have to "copy" it.

But the German report quotes an unnamed engineer as admitting: "We know what Red Bull are doing, but we do not know how."

Auto Motor und Sport said the innovation is worth about "half a second" per lap.

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