Renault front wing may have changed several times but on the contrary the rear wing follows a less aggressive development program . At Canada the R30 featured a new low downforce rear wing which was the second version since season start and the fourth since winter testing .
Renault initially declared that would not intend to waste time and effort on developing its own version of the F-duct system but rather on extensive R30 development . Several months have passed since then and now at Belgium Renault presented its own version of the rear wing stalling system . The team obviously changed mind and voted yes for developing its own version , even though the F-duct system would be out of rules next season , probably because firstly the R30 shows great potential and secondly the battle with Mercedes GP for the 4th constructor’s championship position is within realistic reach .
Renault’s decision to have its own version paid off at Spa as Kubica was high on top speed list . Furthermore the team evaluated the system to worth up to half a second in the long Spa track but according to Kubica Renault is not going to re-use the system at next race at ultra low downforce track of Monza .
Qualifying Speed Trap
|Pos||No||Driver||Time of Day||Speed|
|16||22||Pedro de la Rosa||14:10:39||301.3|
Renault’s F-duct system is operated by the driver’s left hand . Inside the cockpit and behind the driver’s left shoulder there is small rectangular hole connecting the system to the driver’s operating control area . If we take a closer look on the cockpit area behind the driver we can a see that the introduction of the system caused the left rear cockpit wall to rise up a little so as to fit the system’s tube .
The system itself receives air from two little holes placed on either side of the airbox ( 1 ) . When the system is activated by the driver at straights the air entering the holes mentioned before , feeds the main plane of the rear wing ( 2 ) , which is connected to the system via a small inclined downwards tube hosed inside the engine cover . When the system is inactive the air then flows out and under the wing’s profile ( 3 ) via another tube (black colored) placed further below the first one . Nevertheless the exiting flow from the black lower tube is directed above the extra winglet mounted on the wing’s beam so as not to block the airflow onto it .
A clever evolution of the system would be to sent the exiting air , by first speeding it up using a Venturi effect inside the tube , directly onto the winglet to maximize the downforce production
The R30 run at Bahrain ( and late winter test at Barcelona ) a W-shaped waved rear wing , with a single pillar  to increase wing’s stiffness and a black colored Gurney tab  to help increase the level of downforce . The endplates though remained similar to the launch spec , with three horizontal slits  and a cut at their up rear part  to reduce drag .
During winter testing at Valencia and Jerez the R30 run at least two different spec of wings . At Valencia the wing had a highly waved-shape and a “gigantic” tab to produce a big amount of downforce . At Jerez the R30 was equipped with a new diffuser that made the car produce more downforce and that allowed the team to dramatically reduce the size of this tab in favor of top speed .