MC, here's my view on it: http://www.f1technical.net/development/95manchild wrote:That front "ducting" is a two part system consisting from inner CF ring glued to rim while rim cover is attached to wheel nut. When replacing tyres rim cover goes off the wheel together with the nut and than gets back on wheel when nut is screwed.
Am I right? Has anyone seen tyre change detail? I guess that rim cover stays still on an additional bearing over the wheel nut while the only mystery remains what keeps rim cover in one position. The logic tells us that it is the weight but could it also be the aero shape from the inside (the thing we don't see?).
Thus, anything in the invisible box created by the measurements in article 11.4 are not bound by the regulations in article 3.15 about aerodynamic influence.3.15 Aerodynamic Influence
With the exception of the cover described in Article 6.5.2 (when used in the pit lane) and the ducts described in Article 11.4, any specific part of the car influencing its aerodynamic performance:
Any device or construction that is designed to bridge the gap between the sprung part of the car and the ground is prohibited under all circumstances.
- Must comply with the rules relating to bodywork.
- Must be rigidly secured to the entirely sprung part of the car (rigidly secured means not having any degree of freedom).
- Must remain immobile in relation to the sprung part of the car.
No part having an aerodynamic influence and no part of the bodywork, with the exception of the skid block in 3.13 above, may under any circumstances be located below the reference plane.
11.4 Air Ducts
Air ducts around the front and rear brakes shall be considered part of the braking system and shall not protrude beyond:
Furthermore, when viewed from the side the ducts must not protrude forwards beyond the periphery of the tyre or backwards beyond the wheel rim.
- a plane parallel to the ground situated at a distance of 160mm above the horizontal centreline of the wheel;
- a plane parallel to the ground situated at a distance of 160mm below the horizontal centreline of the wheel;
- a vertical plane parallel to the inner face of the wheel rim and displaced from it 120mm toward the centreline of the car.
All measurements will be made with the wheel held in a vertical position.