Removing the rear beam wing would have a huge impact here, that beam would have at least tripled the natural frequency of the rear meaning a much larger energy required to obtain the same magnitude of "wobble". If I had to guess I'd say some bump or something near the beginning of the straight caused the flow to briefly detach or deviate on one side of the upper wing causing an asymmetric loading, then this small pertubance grew as an unstable oscillation from side to side as the car went down the straight. If I remember correctly this was most apparent on Hamilton at the end of the back straight, which pretty much rules out any effects due to dirty air in front of the car and is significant because that straight is so damn long that oscillations have a while to grow.turbof1 wrote:Does the loss of the beam wing has anything to do with this? Loosing the rigidity it gives to the rear wing?
Someone asked if structurally this is ok - answer its certainly undesirable, CFRP isn't meant to flex at all a lot and some delimitation probably occurred. Clearly the wing didn't fail, but the aerodynamicists won't like the wing shaking about like that and anyone looking at the telemetry probably won't have enjoyed what it did to their readings. This isn't like a flexing front wing where there is some obvious aero benefit, I doubt this is intentional.