Such is the pace of development, Lotus had made at least two changes from the specification I described in my last analysis of the Lotus E20.
The teams have further modified the front wing with a revised cascade winglet and the sidepod fronts have reverted to an old shape without the peaked visor below the sidepod inlet.
The revised front wing detailed previously has now gained a different cascade element. Rather than the narrower free standing winglet, the cascade is now wider and joins to the vane on the endplate. The winglet has a distinct twist to its profile, having far more angle of attack at its outboard edge to send a stronger tip vortex to direct airflow around the front tyre.
Where as the wing was new, the sidepod goes back to the design first tested, where the sidepod inlet now has only an upper peak. Where as the upper peak also houses a short Side Impact Protection spar, the peak that used to side lower down at the of the sidepod of the sidepod inlet appears to be a purely aerodynamic addition, as it did not house a SIP. Potentially the lower peak was to reduce the effect of airflow spilling back out of the duct at high speed. Lotus made great efforts with the E20′s internal aerodynamics, with the streamlined heat shielding beneath the outer bodywork improving flow of the sidepods to create less drag. Perhaps there was more spillage than expected with the early and this has subsequently been resolved.
As mentioned in the previous analysis, the sidepod fronts exploit a small vortex generator (VG) on the top edge of the sidepod; this is also aided by another VG under the wing mirror.