A new rear wing was brought and raced in Melbourne with a smaller second flap ( the movable one ) and a revised main profile which produces more downforce , a change made to regain the lost amount of downforce caused by the size reduction of the second flap . Free practice sessions gave the opportunity to the team to test fluorescent paint on the rear wing once again which by the way lacks any supporting pillar to the car body .
Another upgrade in Melbourne for VJM04 was a new front wing. The new one has an extra inner bending outwards vertical fence (No1) to push airflow towards the endplate aiming drag reduction in long straights with the help also of the deep cut spotted on the outer extremities of the second flap . Secondly the flaps separator is shorter and simpler as there is no need anymore to house the flap angle adjuster as it used to last season . Despite the arrival of the new wing Force India preferred to test also the old spec to exclude useful data from the performance comparison between the old and the new wing .
Like Ferrari so the VJM04 has triangular airfoils under the mirrors to split airflow over the sidepods and into the radiators .
Force India reverted from an arched airbox structure to a blade roll one for the VJM04 , copying last season’s Mercedes W01 project . Despite the fact that regulations about blade roll measurements ( 15.2.4. article ) have changed since 2011 , Force India constructed a thicker blade roll compared to the very thin and long W01’s one (to ensure driver’s head protection and obey the new rules ) because the blade roll structure still offers a better airflow towards the rear wing and also a shorter and lighter airbox .
Team Lotus is another team to adopt the blade roll structure .
“15.2.4 The principal roll structure must have a minimum enclosed structural cross section of 10000mm², in vertical projection, across a horizontal plane 50mm below its highest point. The area thus established must not exceed 200mm in length or width and may not be less than 10000 mm2 below this point.”
Force India in Jerez joined the club of teams which tested the flow visualization paint. The rest teams which tried that special paint were Mc Laren ( white-blueish paint) , Lotus Renault (greenish paint) , Red Bull ( yellow-green paint) and Williams ( purple-white paint ) . Force India focused on studying the aero efficiency of the rear wing flaps and beam and to what extend the blade roll structure impacts on rear wing downforce production .
( for details on flow visualization paint check https://formula1techandart.wordpress.com/2011/02/20/red-bull-rb7-getting-green-at-jerez-february-test )
|Chassis||Carbon fibre composite monocoque with Zylon legality side anti-intrusion panels.|
|Front suspension||Aluminium uprights with carbon fibre composite wishbones, trackrod and pushrod. Inboard chassis mounted torsion springs, dampers and anti-roll bar assembly.|
|Rear suspension||Aluminium uprights with carbon fibre composite wishbones, trackrod and pullrod. Inboard gearbox mounted torsion springs, dampers and anti-roll bar assembly.|
|Overall weight||640kg (with driver, by regulations)|
|Wheels||BBS forged wheels to Force India specification|
|Engine supplier||Mercedes Benz High Performance Engines V8 2.4-litre|
|KERS||Mercedes Benz High Performance Engines|
|Transmission||McLaren Racing 7-speed, semi-automatic, ‘e-shift’|
|Lubricants||Mobil 1 products|
|Clutch||AP Racing carbon clutch|
|Brake system||AP Racing|
|Brake material||Carbone Industrie|
credit : Force India F1 team
Jerez , February testing
Pirelli replaced Bridgestone as the official tyre supplier in 2011 season . During the first two Winter tests at Valencia and Jerez the front tyres of Pirelli were found to be less “strong” compared to Bridgestone , suffering greater degradation . For that cause Force India at Jerez housed an infra red sensor inside the left mirror to monitor tyre temperature . The data gathered will help the team to understand tyre working temperature , tyre ware linked to temperature and to adjust better front suspension set up by increasing or decreasing tyre contact surface on track in order to get the maximum from the Pirelli tyres .