Continuing their current theme of innovation Force India (FI) produced a revised rear end for the VJM03 in the latter days of the Barcelona test. This included a revised beam wing set up and enlarged cooling outlets.
Originally it appears that the FI used a very tall diffuser and a split rear beam wing. In Actual fact the car used a lower diffuser, but what appears to be the top section of diffuser was a second full width beam wing, sat ahead of the split one. Although the rules demand ‘one closed section’ (i.e. one element) for the area containing the beam wing, there is a free zone for bodywork sat ahead of it. Last year both Ferrari and Toyota exploited this area for a second beam wing sat in tandem ahead of the other one.
With the update there are now two full width beam wings, the rearward one no longer split but instead hooking up over the rear crash structure. However the forward beam wing remains (yellow) and sits in a cascade with the diffuser, to create a high expansion ratio diffuser by effectively making a taller exit (light grey). Also aiding the diffuser exit are a pair of fins attached the outside faces of the diffuser and stack of winglets affixed the rear brake ducts.
Allied to the diffuser changes the hump enclosing the rear of the sidepods around the gearbox was cut open to allow for greater cooling in the opening flyaway races. Allied to the rear end of the coke bottle shape, the exhaust outlets and a gaps made for the suspension that allow hot air to escape the sidepods (all shown dark grey).