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Lotus Renault R31 – A step backward


In Malaysia R31 reverted back to the  beam wing version with the lower arched centre zone , which was tested before season starts  . In Australia the R31 chose to race with a taller design to maximize downforce production .

Lotus Renault R31 – One more diffuser upgrade in Malaysia


   In Malaysia a metal joint was placed in the centre of the slotted tab to secure its stiffness  . Excessive vibrations of an element ruins its aerodynamic or mechanic effectiveness and  can even  cause it to crack in some occasions .

Lotus Renault R31 – More diffuser revisions in Australia


    Melbourne

  The diffuser was again revised in Australia despite the latest upgrade at Barcelona test ,  having now a new slotted tab under the crash structure to let air bleed through . The pioneer of the slotted tab feature is credited to Toro Rosso and Renault is another team ( along with Red Bull and  Mc Laren  ) to copy this idea .

https://formula1techandart.wordpress.com/2011/04/22/toro-rosso-str6-diffuser-update-before-melbourne/

  Barcelona test on March

Lotus Renault R31 – Another new version of the front wing was launched in Sepang


Renault seems to follow the same frenzy front wing development path  like it did last season and launched a new front wing iteration in Sepang . The wing may had new endplates but the flaps remained though unchanged .  The revisions are spotted on the front part of the endplate body which is now consisted of a single element instead of two with its base to be inclined outwards creating a large gap between its inner surface and the double profiled mini wing . The horizontal winglet  is also gone while the outer low height vertical fence is new and features a deep cut on its lower rear part . All the changes focus to reduce turbulence around the outer front tyre surface .

Lotus Renault R31 – Aero performance evaluation in Melbourne


 

Free practice sessions on Friday in Melbourne was an opportunity for Renault  to evaluate R31 aero performance with the help of fluorescent paint . Renault was not the only team to experience fluorescent paint on their cars but Ferrari as well .

( for details on flow visualization paint check  https://formula1techandart.wordpress.com/2011/02/20/red-bull-rb7-getting-green-at-jerez-february-test )

 

Lotus Renault R31 – Ensuring floor splitter stiffness in Melbourne


 

R31 splitter ( T tray ) sports high vertical side fences (No1) to create a channel over the splitter channeling air inside the bargeboard shield and around the side pod bottom . There is also an outer tunnel (No2) to improve airflow under the chassis towards the diffuser  . To decrease vibration of this outer tunnel which affects performance negatively Renault in Melbourne used a metallic bonding (No3) to support the structure .

 

 

 

Categories: Lotus Renault R31

Different front brake duct option for Renault drivers in Melbourne


 

Heidfeld different driving  style made him choose the larger brake ducts while Petrov the thinner in Melbourne . This is not something new for Renault as Kubica and Petrov in some occasions back in 2010 also raced different ducts suited of course to different front wing specs . However this time both drivers used the same front wing in Melbourne despite the different option on the ducts .

Lotus Renault R31 – updated diffuser before season starts


Barcelona test on March

 

The floor and nose vanes revisions forced the team to alter also the diffuser by lowering the outer channels proving once again that there is a vital connection between diffuser and car front end. Another change took also place to the rear beam wing which now has a taller arched centre zone to improve downforce production . Lastly the tab under the rear structure lost its cut  ( all changes in yellow ) .

 

Launch

Lotus Renault R31 – Front brake ducts , pre season variations


 

Two front brake ducts regarding size and shape were tested during winter testing . One small and one boxy and larger  . However the new front wing launched in Barcelona ( February test ) was only used with the small ducts while the old with both specs.

 

 

 

 

 

 

Lotus Renault R31 – Front wing , pre season revisions


 

A new front wing was tested in Barcelona on February which has a bit larger endplates and also the space between the second  flap and third flap tip has been increased by little  . Small revisions may improve only by a small amount  car’s performance but launching constant  even minor changes in almost every race can give the car steadily significant speed . That kind of approach was followed by Renault last year especially about front wing development ,  a trend not surprising to see it repeated this season as well .

 

 

 

Lotus Renault R31 – Floor revisions at last winter test


 

The larger new vanes under the nose increased the strength of  air flowing under the nose and around the sidepod bottoms and so Renault like Ferrari made some modification to  the floor and particularly to the floor side fences . The half oval former fence is now replaced with a combination of two completely different fences . The first resembles to the old one but is now smaller and a bit to the front  and aims to improve the efficiency of the floor turning vanes  . The second fence is quite long , stepped and  prevents  any flow mixing between the under and over floor air layers  and also  has a slit to bleed air to cut drag .

 

Categories: Lotus Renault R31

Lotus Renault R31- enlarged nose vanes


 

To increase the quantity of air flowing under the nose Renault enlarged at last winter test in Barcelona  the vanes hanging under the nose and below the suspension elements .

 

 

Categories: Lotus Renault R31

Lotus Renault R31 – Optimum camera position


 

Renault at Jerez ( February testing)  moved the camera position from nose box sides to inboard wing pillars . The new camera position help the wing to produce a bit more downforce  .

 

 

Categories: Lotus Renault R31

Lotus Renault R31 – Innovative forward exhausts


A great novelty as regards Renault exhausts , proving that stricter rules can not ban creative spirit in Formula 1 but to redirect it exploring new innovative ways  .So Renault instead of finding a way to bend the rules and  blow the diffuser with hot exhaust emissions either through the sides or through the engine starter hole  ,decided to construct forward blowing exhausts !  The innovative forward exhaust pipes have an elbow ending configuration to blow under the chassis and energize airflow under the floor and towards the diffuser .  To prevent any floor toasting close to the exhaust pipe opening Renault placed a metal heat cover and also tested in some occasions heat sensitive green stripes under the floor or red stripes over it to check any heat issues rising from this configuration .

Lotus Renault R31 – Sidepod panels


 

R31 sports a very simple sidepod panel  compared to the more complicated designs of Force India VJM04 , Ferrari F150 , Mercedes W02 and others . I foresee changes to take place in this area to favor aero efficiency , changes that will be probably connected with the arrival of the new diffuser already tested in last pre-season test .

 

 

 

Categories: Lotus Renault R31

Lotus Renault R31 – rear floor details, cutting drag

February 26, 2011 6 comments

 

R31 proved to be quite fast during winter testing , a fact not only credited to the front exhausts exit but also to the highly detailed design of the car .  In particular the crucial area  in front of the rear wheel  is very advanced featuring a triangular vertical fence (orange arrow) and a pointing outwards trapezoid channel  (orange line) to significantly cut drag . Williams FW33 has also an analogous trapezoid channel for the same reason .

 

 

From a side view the plank under the floor can be spotted (No 2) alongside with the diffuser side vertical fence (No 1)

 

Categories: Lotus Renault R31

Lotus Renault R31 – wheel force transducer

February 21, 2011 1 comment

 

Pirelli and Bridgestone tyres have significant differences in skeleton structure, so Pirelli tyres suffers  different shape deformations especially when cornering and decelerating  than Bridgestone  . Deformations may increase or even decrease tyre contact patch and even cause excessive ware . To understand this phenomenon and how tyre shape changes depending on longitudinal and lateral forces applied on the wheel-tyre combo, Lotus Renault during Jerez test used a wheel force transducer on both the rear and front wheels . Apart from the tyre dynamic evaluation , the wheel force transducer  can also provide help on perfecting the suspension settings especially when kerb riding.

That type of device is fitted  on modified rims and  provide data about range of forces suffered by the wheel at different rotation speeds  (r.p.m. ) . It is consisted of a magnesium rim , a sensor body of Titanium alloy and sensors and it is not the first time Renault uses such a device .

Lotus Renault R31 – Wheels


Tyres : Pirelli , replaced Bridgestone

Rims : O.Z. Racing , made of magnesium alloy and painted in golden color to fit new Lotus Renault car livery

Brakes :  AP racing calipers and carbon made discs

Categories: Lotus Renault R31

Lotus Renault GP R31 – Technical Specifications


Technical Specifications

 

Chassis
Moulded carbon fibre and aluminium honeycomb composite monocoque, manufactured by Lotus Renault GP and designed for maximum strength with minimum weight. RS27-2011 V8 engine installed as a fully-stressed member.

Front suspension
Carbon fibre top and bottom wishbones operate an inboard rocker via a pushrod system. This is connected to a torsion bar and damper units which are mounted inside the front of the monocoque. Aluminium uprights and OZ machined magnesium wheels.

Rear suspension
Carbon fibre top and bottom wishbones with pull rod operated torsion springs and transverse-mounted damper units mounted in the top of the gearbox casing. Aluminium uprights and OZ machined magnesium wheels.

Transmission
Seven-speed semi-automatic titanium gearbox with reverse gear. “Quickshift” system in operation to maximise speed of gearshifts.

Fuel system
Kevlar-reinforced rubber fuel cell by ATL.

Cooling system
Separate oil and water radiators located in the car’s sidepods and cooled using airflow from the car’s forward motion.

Electrical
MES-Microsoft Standard Electronic Control Unit.

Braking system
Carbon discs and pads.
Calipers by AP Racing.
Master cylinders by AP racing and Brembo.

Cockpit
Removable driver’s seat made of anatomically formed carbon composite, with six-point harness seat belt by OMP Racing. Steering wheel integrates gear change and clutch paddles, and rear wing adjuster.

KERS
Motor generator unit driving into front of engine with batteries as an energy store.
Motor Generator supplied by Renault Sport F1.
Electronic control unit by Magneti-Marelli.

Car dimensions
Front track: 1450 mm
Rear track: 1400 mm
Overall length: 5100 mm
Overall height: 950 mm
Overall width: 1800 mm
Overall weight: 640 kg, with driver, cameras and ballast

 

 

RS27-2011 Engine Specifications

Capacity: 2400 cc
Architecture: 90° V8
Weight: 95 kg
Max rpm: 18,000 rpm
ECU: MES SECU
Fuel: TOTAL
Oil: Elf (a brand of TOTAL)
Battery: Lotus Renault GP

credit :  Lotus Renault GP

Categories: Lotus Renault R31

Genii Capital and Group Lotus join forces in Lotus Renault GP


       Genii Capital and Group Lotus plc  announced the creation of Lotus Renault GP, the successor to the Renault F1 Team that will contest the 2011 FIA Formula One™ World Championship.  Renault sold its remaining shares in the team to Genii Capital and will be the engine and technological and engineering supplier to the Lotus Renault GP team which will continue to compete with the Renault chassis name and Renault will enjoy pre-eminent brand exposure on the livery.

 

The visual of the 2011 livery is shown on a model of the 2010 race car, the R30. This artist’s impression may still undergo detail modifications prior to the start of the 2011 season

 

 

 

       For 2011, the Lotus Renault GP cars will race in a new interpretation of the iconic black and gold colours that were last used when Lotus and Renault joined forces in the 1980s. This livery, which has been on the drawing board for over two months in order to reinterpret its iconic graphic signature to suit modern media requirements, is sure to strike a powerful chord with the sport’s enthusiasts around the world.

 

 

full article here => http://www.renaultf1.com/Genii-Capital-and-Group-Lotus-join,3763.html

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