Williams have been using an engine
cover similar to the rest of the field thus far this season with a
centralised cooling outlet/funnel.
However in China the team
returned to a design they used throughout 2013, which is much
shorter, features a much larger cooling outlet at the base of the
engine cover and utlises a Shark Fin in order to meet with the
dimensional restrictions in the regulations.
The team also briefly tested a similar
cover which featured gills along the fins length (picture from Felipe
Massa's Instagram account above). This cover is a little different
in the way the Shark Fin interacts with the rest of the engine cover
(less of a bodywork void) so I'd suspect the gills help
aerodynamically, to coax the airflow across the surface.
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