To wade in on this.... that movement isn't being fully generated by the flexing of the bridge wing... it's being generated by the flex in the main plane of the wing.
Watch the video closely, and you'll see the outer lower elements of the wing flexing downwards. As the bridge wing is attached to the endplates, this also drops downwards, closer to the nose (which is the effect seen here). Given that also the span of the wing is also being streched (as the endplate will rotate slightly, rather than moving straight up and down), this exagerates the movement, effectively flattening the centre section.
Now, how is this legal? Simple, the FIA have a test where they place a specified load on the wing endplates, and the wing cannot deflect more than a certain dimension. If it passes the test, then quite simply it's legal. As the bride wing is attached to the endplates, if the lower wing passes, then the bridge wing passes too.
The whole idea of the bridge wings is to use the centre section to guide the flow to the rear wing, by directing the air flow in the best possible direction over the cockpit... whilst the outer sections generate some downforce for minimal drag.
McLarens seems to be the most extreme example (especially given it now uses a slot in the outer section). Renault for example have a strut to hold the centre section in place.
Regards
Ed
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