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14 April 2014
Comparing powerunits, understanding early season issues and the real reason why Mercedes AMG F1 are ahead


2014 has thus far provided us with the backdrop to several drama's but for me it has been the source of major frustration.  2014 marks a point in Formula One that not only see's the largest rule change in the sports history but hinges on a major technological leap forward.  Unfortunately I'm left aghast at the poor coverage supplied by the UK broadcasters (at least) which not only borders on propaganda/misinformation but moreover shows their disinterest in covering what makes the sport tick.

The latest signal of this was the Skysports feature over the Bahrain GP weekend claiming an exclusive as to why Mercedes were so fast compared to their rivals.  The piece although great from the perspective they were actually covering the technical side of the sport was good, however their claim on an 'Exclusive' is somewhat incorrect.  Myself, @ScarbsF1, @RacecarEngineering amongst others have all talked about this in the past via Twitter (albeit with the exception of Racecar Engineering who actually published it in their magazine on 5th March).  Furthermore pretty much anyone who looked over the regs ahead of 2014 would have realised that splitting the turbo and installing the MGU-H between it in the V was a great way to package it.  I even drew it way back in 2011/12 and published it in January 2013 when I took a look at the PU's and packaging on the blog.

 Above: Mercedes PU shows that the compressor end of the turbo is mounted at the front of the block

The insinuation that the works team are the only ones that could fully utilise the advantages of this turbo layout however are unfounded.  I actually corrected misinformation that Crofty gave via twitter during his '#AskCrofty' after the Bahrain GP.

(This is part of my frustration, if you don't understand or know about these sort of things then don't comment, I try to stay away from bum steering people and although I know a fair bit I'm always learning...)

The Homologation process covers the ICE, Turbo, MGU-H and MGU-K meaning that the split arrangement is run by ALL Mercedes powered teams.

Don't get me wrong, the advantages gleaned by Mercedes (works team) are reliant on the split turbo configuration but it's how it's been used to package other items that stands them apart from McLaren, Force India and Williams.  I won't go on to tear down the rest of the Sky package but suffice to say there are other technical elements that are incorrectly displayed during the presentation.

So what are the differences between the teams?

I'll start out with cooling options and for those of you uninitiated in the realms of turbocharging, a charge cooler (air to liquid to air) used to be seen as an inefficient way of cooling the inlet charge with most applications utilising an Intercooler/Aftercooler (air to air).  This is because most people perceive the additional items required by a chargecooler to equate to additional weight.  However over recent years opinion has swayed with the design of them (air to liquid to air) going back to the drawing board rather than just thinking of them as an air to air cooled, water jacketed.  Air to air coolers are most effective when able to be placed in freestream air and so you'll usually see them front mounted on road cars.  Air to air coolers for a single seater with a singular centreline turbo however brings forth some compromises in terms of pipework with much larger diameter pipework needed to carry the boost into and out of the cooler.  Symmetry is an important aspect for Formula One teams as not only do their initial calculations (CFD) run with 1/2 a car mirrored (obviously Lotus are an exception to the rule this season) but having a differential in drag/aero performance on one side of the car can of course be detrimental to performance.  This really brings rise to several layout options for the teams:

  • Twin engine radiators (smaller than their usual capacity due to the downsizing of the engine) with twin air to air coolers mounted in conjunction with them, keeping the aero status quo.  The downside of this is the increased level of pipework, especially the larger diameter boost pipes.

  • A singular engine radiator, obviously larger than the one used in the setup above mounted in one sidepod, with a singular but similarly sized air to air cooler mounted in the opposing sidepod.  The issue here would be the difference in core thickness between the water filled radiator and boost filled after cooler.  Symmetry would also be lost in terms of the boost pipe sizings vs the water hoses.

  • A charge cooled (air to liquid) setup would allow for similarly sized water radiators to be placed in either sidepod (one for engine cooling, the other for the chargecooler) with the water jacketed cooler placed between the turbo's compressor and the inlet.  This setup has a few drawbacks which invariably outweigh the positives, the jacketed cooler's weight is placed relatively high up (increased CoG) but the shorter tract between the compressor and the inlet means you have less pressure drop (increased performance).  The use of the pre-rad to support the chargecooler means that there isn't the packaging issues associated with the larger diameter boost pipes used with the air to air setups.
  • A charge cooled (Air to liquid to air) setup with an engine radiator (smaller than the iteration above), pre rad and a chargecooler, either side of the car.

Mercedes


Above: Mercedes WO5 powerunit & associated radiator layout in the right hand sidepod courtesy of AMuS

Above: Mercedes WO5 powerunit & associated radiator layout in the left hand sidepod courtesy of AMuS 

The symmetry of the two sidepods points squarely at Mercedes opting to place their chargecooler in a void between the engine block and the fuel cell, giving the shortest boost tract and requiring the least space in terms of packaging for the sidepods, whilst maintaining the symmetry of the components housed within the sidepod.

McLaren

Above: McLaren MP4-29 powerunit & associated radiator layout in the right hand sidepod courtesy of AMuS
 
Above: McLaren MP4-29 powerunit and air-to-air cooler layout in the left hand sidepod courtesy of AMuS

The MP4-29 has a twin stack of radiators placed in the right hand sidepod, whilst their air-to-air cooler finds a home in the left hand sidepod.  The layout is a little un-conventional when compared with the last few seasons with the coolers inverted. The twin radiator layout in the right hand sidepod also leads to an elongation on that side, whilst a plethora of pipework at the front edge of the bodywork points to the team circulating the airflow around the coolers.

Force India

 Above: Force India VJM07 powerunit and associated radiator layout in the right hand sidepod courtesy of AMuS

Above: Force India VJM07 powerunit and associated air-to-air cooler layout in the right hand sidepod courtesy of Racecar Engineering

Force India's approach is perhaps the most obvious choice in terms of the air-to-air variants and from the image above we can see the effort that has been made in order to get the coolers ahead of the ICE, therefore the heat generated by the exhausts is less of a factor.  Force India have opted for the more conventional laid back coolers to maximise airflow passing over their surface.  Bear in mind that the arrangement of the cooling fins have to be orientated to take this into effect too as otherwise it wouldn't be worth tilting them.

 Above: Williams FW36 powerunit and associated radiator layout courtesy of AMuS

Pictures of the FW36's internal packaging are a little rare, but what I can make out from the limited information is that they have gone for the conventional laid down orientation of the coolers.  I'd also surmise that like Force India they have opted for the engine radiator in one sidepod and air-to-air cooler in the other option but I'll verify this when I have the proof.

Above: Red Bull RB10 powerunit & associated radiator/chargecooler layout in the right hand sidepod courtesy of AMuS

Above: Red Bull RB10 powerunit & associated radiator/chargecooler layout in the right hand sidepod courtesy of AMuS 

Red Bull appear to have taken the heavier solution to chargecooling, stacking both the ICE radiator and chargecooler pre radiators in each sidepod, whilst the chargecooler is mounted aft of them.  This is perhaps more pertinent given the decisions made by Renault in terms of the turbo's configuration as the boost pipework will be shorter and placed alongside the turbocharger (having not split the compressor from the turbine like Mercedes).

Caterham

Above: Caterham CT-05 powerunit & associated radiator/chargecooler layout in the right hand sidepod courtesy of AMuS

 Above: Caterham CT-05 powerunit & associated radiator/chargecooler layout in the left hand sidepod courtesy of AMuS

Caterham have followed a very similar path to Red Bull in terms of stacking twin ICE radiators in either sidepod with the chargecoolers pre rads, the angling of these is much sharper though in order to curtail their presence ahead of the exhaust manifold.

Lotus

Above: Lotus E22 powerunit & associated radiator/ chargecooler layout in the right hand sidepod courtesy of AMuS

Above: Lotus E22 powerunit & associated radiator/ chargecooler layout in the left hand sidepod courtesy of AMuS

Lotus have also gone down the chargecooled route but have a different layout to the previous two Renault powered teams with the ICE radiators and chargecooler pre-rads mounted almost vertically/longitudinally with the chargecooler itself lying under the rear rad.  To supplement the flow of cool air in that region the team have also utilsed a floor duct for the left hand sidepod due to the increased piping created by that exhaust (I'll explain this a little more later).

Toro Rosso

Above: Toro Rosso STR9 powerunit & associated radiator/ chargecooler layout in the right hand sidepod courtesy of AMuS

I've only been able to find an exposed photo of the right hand sidepod of the STR9 thus far (and not the best angle) but I can see that the team have a double stacked radiator configuration with the chargecooler mounted aft of it.  I'd suggest that the team will have mirrored the layout in the opposing sidepod.

Ferrari powered teams

As images of the Ferrari powerunit and it's configuration aren't readily available I'll comment on the Marussia and Sauber layouts instead.  However from the limited images of the F14T I have seen bare I'd conclude the team like the teams they're supplying are running a chargecooler arrangement.

Above: Marussia MR03 powerunit shown bare in the right hand sidepod courtesy of Racecar Engineering

Above: Marussia MR03 powerunit & associated radiator layout in the right hand sidepod courtesy of AMuS
 
 Above: Marussia MR03 powerunit shown bare in the left hand sidepod courtesy of Racecar Engineering

From these images I'd surmise that Marussia have opted to run a chargecooled setup with an engine radiator in one sidepod and a pre-rad in the other.  This makes the Ferrari configuration closer to the Mercedes one than say the Renault one but it still holds a significant variation.  Ferrari have not opted to separate the compressor and turbine and run the shaft through the engines V, however it would appear the boost pipe from the compressor is routed through there (through a donut in the airbox pipework), terminating at the chargecooler.  The air is then cooled within and exits from the top into the inlets (pipework which has the green temperature stickers on it).

Above: Sauber C33 powerunit & associated radiator layout in the right hand sidepod courtesy of AMuS

Above: Sauber C33 powerunit & associated radiator layout in the left hand sidepod courtesy of AMuS

As you can see I have limited images of the C33 to work with but apart from the orientation of the radiators (in this car they are vertical) they appear to be using a chargecooled setup, the same as Marussia.

Above: Mercedes powerunit with the 'log style manifold' highlighted with the original image courtesy of Racecar Engineering

This next section may involve a bit of scrolling back to the pictures I've used above rather than filling the article with yet more images.  One of the other areas that can be changed by each team in order to enhance performance is the exhaust.  You'll note that from all of the images presented of Mercedes powered cars the teams are utilising a log manifold rather than the equal length ones we are used to seeing.  Now this is an area of performance that is a trade off and so depending on where you are wanting to make gains it would change your approach.  Furthermore there are still design considerations and marginal differentials in each design that can affect both torque and power curves. Add into the mix what the MGU-H is capable of doing in terms of spooling / supporting the turbocharger, what size and/or scroll your turbo is and you have some serious decisions to make.

Above: Red Bull having to make some hurried alterations to their bodywork during testing due to the close proximity of the exhaust to that region of bodywork. Other issues surrounding the heatsinks used for the ERS led to a higher core temperature in the sidepods than anticipated, making this a hot spot.

All the other teams but Red Bull are utilising an equal length manifold which resides aft of their engine and charge air cooling solutions.  Red Bull have laid their manifold flat underneath the chargecoolers in a configuration that lends itself towards an equal length variant, however with the limited vertical space it's difficult to ascertain whether it truly is equal length and could be a hybrid of both solutions, simply extending the header lengths.  The advantage of the layout used by the Mercedes powered teams is the sheer amount of space saved by running the manifold directly to the turbine.

Above: Marussia MR03 powerunit & associated radiator layout in the right hand sidepod courtesy of AMuS

Wastegate(s) are another component that can be selected by each team but will likely take instruction from the manufacturer in terms of their installation and operation.  Ferrari powered teams (above) have opted to have twin wastegates (one for either manifold) as part of the Turbo/MGU-H assembly with significant pipework diameters being proportioned off.  All of the other teams are using a singular wastegate with significantly smaller pipework (usually running off the centreline), whilst Lotus once again do their asymmetric thing and run only one wastegate from the left hand exhaust bank.  There are some plausible (but marginal) advantages that could be extracted aerodynamically from the wastegate that I've talked about before and this might be what Lotus are trying to do with their asymmetric layout.  The wastegate is an important element for the new powerunits and must be robust, several of drivers/teams have had issues with them already, probably most famously Sebastian Vettel.  Their control and effectiveness is important due to the way the MGU-H operates alongside it, with a decision to be made over which one curtails the turbo based on the cars current SOC (State of Charge, ERS language for the amount of energy being recovered and sent either to the ES or directly to the MGU-K).

Ferrari powered teams thus far seem to have fallen a little short of the mark with a large disparity in top end performance which was clear to see when it left Alonso a sitting duck for an attack by Hulkenberg in Bahrain.  It seems their issues revolve around the way in which the two MGU's distribute power to one another and could be the result of mistakes made in selecting the size of their turbocharger.  Towards the top end of the powerband it would be wise for the MGU-H to be harvesting power (ie curtailing power) and sending it directly to the MGU-K for additional power.  However it seems that the Ferrari powered teams are unable to do this and instead are using energy from the ES which in turn is being depleted too rapidly, resulting in less top end horsepower.

Last but no means least is a question mark over exhaust bore, you'll note from the images that all the teams have different sizes, tailored to their own performance needs.  It's not an area of massive potential due to the energy leaving the exhaust being lower than in previous seasons but still worth a mention as it can be adjusted by each individual team.

In summary the Mercedes powerunits split turbo arrangement is a performance differentiator but it's decisions that the team have made in the rest of the installation that sets them apart from even those teams that also run the Mercedes HPP unit giving them not only a power advantage but creating a more internally aerodynamic efficient car.  It's quite clear to see by the behavior of the Mercedes powered cars that their ERS in it's entirety is much more mature than their counterparts, with the Renault and Ferrari powered teams struggling generally with the transition of energy under acceleration and braking.  This affects the brake-by-wire system, as holes in the provision of energy or during harvesting will lead to communication issues between the MGU-H, MGU-K, ES, controller and braking system.  All of these lead to a lack of feel/confidence for the drivers who then struggle to let the automation that should be going on in the background do its work.

With the Renault and Ferrari powered teams having issues that really revolve around larger packaging and problems with the ERS, fixing either of these issues during the 2014 season will not only be vast and expensive but come with their own compromises.
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13 April 2014
The 33.33 second misnomer



The way I understand Formula One and try to portray its technical intricacies isn't for everyone and I wouldn't expect it to be.  The sport is a multi faceted one where human endevour has to be matched by technical prowess, this is why the drivers who take the victories on the podium are quick to thank their team, be it at the track or back at the factory.  What does irk me though is when technical aspects of the sport are 'dumbed down', mis interpreted or worse of all incorrectly conveyed (whether it be from a lack of knowledge, ignorance or plain and simple mis information.

The latest of these is the way in which ERS works and yes I know it's a complex system to talk about but if you're going to use it in commentary don't skew how it's used.

For those of you that are going 'what the hell is he talking about' it's the mis-use of 33.33 seconds of energy available for use per lap from the MGU-K.  I understand where the figure has come from but using it without further context is a little frustrating and I'll explain why:

IF the energy provided by the MGU-K were still to be provided by a button press on the drivers steering wheel (a paddle for some drivers) and they had the setting on their steering wheel turned upto maximum (120kw/160bhp) they could drain all 4mj of energy stored in the ES in 33.33 seconds.  Therefore we can see that the time component of 33.33 seconds is simply an extrapolation of the maximum power (120kw) vs the available energy (4mj).

Unfortunately this is where you are being misled as the time component for energy dispensed by the MGU-K is much larger than 33.33 seconds per lap (or should be).  That's in part because the driver no longer presses a button on the wheel to release the energy from the batteries, but instead he will work with his engineers to map performance to the throttle pedal.  This means that the full 120kw doesn't have to be dispensed all the time and can instead by graduated to match the performance of the engine, raising the kw's dispensed the more the throttle is applied.  This of course makes it impossible for us to know the time component as it will be different for every driver, especially as, as with KERS before it the driver can select different maps to work alongside the engine map, reducing or increasing the amount of energy dispensed at a given rpm.

On top of this we have the supplemental energy flow that can be provided by the MGU-H and fed directly to the MGU-K, skipping out the Energy Store and therefore extending the 4mj's lifespan.  This means that if the MGU-K is requesting power it can be sent from either the MGU-H directly, if it's harvesting, from the ES or both! Lest we forget that energy passed directly between the two MGU's is also more efficient as it doesn't have the losses associated with transforming AC/DC or DC/AC.

(As a side note I think it's also important to mention that the MGU-K can only recover and store 2mj's of energy per lap with the other 2mj (to take the ES's level to 4mj) recovered by the MGU-H)

I understand that it's easy to be critical and that the speed that commentary must sometimes be supplied makes it difficult to convey everything, but this generalization of how the energy is 'spent' makes a mockery of what is actually going on under the skin of these cars.

This bug bear is not a new one to me as it was much the same with KERS with it often talked about as giving a 6.67 second boost.  This of course was accurate if were to extrapolate the maximum 60kw/80bhp of power that could have been used and the maximum 400kj's of energy that could be used per lap.  However even this was variable for the driver, usually from a rotary on the steering wheel with the driver able to reduce how much was dispensed in order to increase the time component.

I hope this post helps explain why I think it's important not to use the 33.33 seconds marker when explaining ERS.
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The challenge ahead... Haas Formula LLC


There were echoes of 2009/10 when the FIA announced they would consider applications for 2 more slots from 2015 onwards. I say this because once again it came at a time when a budget cap had also been put firmly on the table.

As always there was plenty of interest, many I'm sure from pretenders that want into F1 but don't understand both the technical and financial task at hand.

Gene Haas (many of you will recognize this name from NASCAR) has had his application accepted by the FIA.  Haas therefore has demonstrated his credentials in terms of technical merit and financial backing, but was this based on a budget capped formula just as the new entrants in 2010 were promised?  I for one hope not, as for me Formula One should remain the pinnacle of motorsport, won by the margins that the team have worked and spent hard to achieve.  Having said that though, I still firmly believe that there are too many teams, leaving some fighting for the financial and technical scraps meaning Haas could just become another number.



Haas is important to the sport and once again tries to bridge the void that Formula One finds itself within in the states.  The relative success of the Austin Grand Prix has only been overshadowed by the constant issues surrounding the New Jersey GP, having a US based team in the sport could finally provide the New Jersey project with the financial backing it needs to come to fruition.  The USA is a huge market and one that Formula One has struggled with over the years, a US based team might finally attract the kind of attention that the sport desires.

The Haas plan by all accounts is to utilise a Dallara produced chassis for 2015 at least. This will at least take some of the pressure off the team in terms of being on the grid in time.  The problem however could come in terms of performance, with the last chassis produced by Dallara (HRT111) far from F1 specification, according to then Technical Director Geoff Willis (now of Mercedes).  Don't get me wrong I'm not saying Dallara can't produce a decent chassis for Haas but as the core of the car, the chassis is undoubtedly an area that must be got right from the start as it affects performance of everything else on the car.  As we've seen in the past drivers can be extremely sensitive to even very small margins of damage to the chassis let alone a poor core design.

Next up is another important aspect and is being highlighted this season by Mercedes superiority, the powerunit. Hondas return to Formula One in 2015 will be with McLaren as their works team, this however doesn't mean we won't see them taking on paying customers with Haas providing the most likely candidate. Rumours are also abound of a return to Formula One for both Ford and BMW but either being ready to be on the grid for 2015 would be a big stretch.  Although with Red Bull pushing Renault hard to recover ground and having strong ties to BMW in other series it's a distant possibility.  The other option would be to re-ignite the Cosworth project, who've worked on an engine for the 2014 regulations but hadn't enticed the customers to put it into production.  It is infact a target for Cosworth to re-enter the motorsport market and they have looked at IndyCar too.

McLaren have always taken the option to use their own gearbox rather than purchase one from Mercedes HPP like Force India currently do.  I'd suggest that Honda won't invest in building their own gearbox on this basis, meaning should Haas use the Honda PU they'll need to build their own gearbox (unlikely) or source one from elsewhere.  I'm sure McLaren would sell them one of their gearboxes having supplied Force India in the past, whilst Williams could be another option having supplied HRT in 2012.

Haas is also looking to retain their operations in the US which places them at odds to the rest of the field who are all European based.  This will of course have an impact on recruiting the type of staff that they'll require to be successful, by all means I'm not saying there isn't US talent out there but they perhaps won't have direct Formula One experience and this could be telling in the gestation period.

Looking down the grid to use other teams as a benchmark and you firstly have to look at the two entrants left from 2010: Caterham and Marussia.  Both have struggled to make the strides necessary to join even the midfield and that's 4 years down the line.. Both teams operate what would be a skeleton staff in comparison to some of their opponents with Caterham employing around 250 people whilst Red Bull are around 550. Now numbers aren't everything and quality also has to come into play, however F1 is a 24/7 operation with team members working in shifts to at least maintain (and ideally increase) their team performance window.  The sheer difference in terms of team numbers is testament to the challenge at hand and the differential between those at the front and the back.

Infrastructure and supply is an incredibly important aspect of Formula One and I'd argue that it would have been easier to have purchased one of the current F1 teams, asset strip them using their staff and infrastructure, learning as they go and creating a similar setup in the states.  The cost to purchase one of the existing teams could outweigh the scratch setup costs and the quicker run up the grid.  Caterham and Marussia are the obvious candidates needing just that last financial push to get them through the gate.  However Force India could be up for grabs at the right price with both Mallya and Sahara on shaky ground financially already. Whilst you'd also have to say a substantial bid could see the overhaul of Sauber and Lotus too.

The key member of staff will be who the team take on as their technical director, get this decision wrong at the start of a teams life and it'll take a substantial amount of time to recover.  I'm left wondering if Mike Coughlin has had any input thus far or will be involved with this projects down the line just purely because of his crossover between the NASCAR and F1 world.  The other more recent technical director that is currently employed elsewhere (Brembo) is ex TD of Toro Rosso, Giorgio Ascanelli.  They could of course entice someone else away from a current team or install someone that's not been employed in that role before.

Wherever or whatever Haas decides to do the task at hand seems almost insurmountable (for 2015 at least) but to succeed in F1 you must push the boundaries and so getting on the grid will be the first of many they'll need to achieve.

Note: Image from www.carolinalifestyles.com
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11 April 2014
Bite Size Tech: Lotus E22 under nose 'snowplough' - Bahrain


Lotus have trialled but not raced their snowplough style appendage under the twin tusk nose since Melbourne, it did however get its first race outing in Bahrain.


5 pylons mounted centrally under the nose form a V and extrude down to the longitudinal plough element. With the twin tusk arrangement airflow still moves centrally under the nose but as we saw with their high nose in 2012/13, Lotus still wanted to manage the airflow under the nose, with them previously utilizing the 'Pelican' underbelly. It's not all about mass flow under the nose at the end of the day, there has to be an element of quality to the airflow. The bowling pin arranged vertical pylons and plough all work to condition the flow that cascades off into the splitter region and moreover around the sidepods. 


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09 April 2014
Bahrain post race test - Technical Image Gallery - Tuesday


A selection of the best technical images from Tuesdays action in Bahrain courtesy of Sutton Images

 Sauber C33 - The team are utilising a pitot tube array in order assess the impact of the tyres wake on the components (Sidepod, Airflow Conditioner, Bargeboard, Floor etc) downstream.  The rig is moveable (vertically) and so the team can do many more measurements out on track without having to come in to reset the rig.


 Ferrari F14T - The team were utilising 2 pitot tube arrays, 1 behind the front tyre and 1 ahead of the rear tyre / over the rear of the sidepod.  The array behind the front tyre measures the wake coming off the tyre and therefore how it impacts the Sidepod, Sidepod Airflow Conditioner, Bargeboard, Floor etc aft of it.  Note its not a full fence like some of the teams use as they're looking at specific target areas of flow and don't want to impinge on performance dramatically as it then creates a further offset for the rig behind.  The reason the team would run both rigs together is all about data collection and analysis within a set time period, track time/testing is finite and so the team will want to gather this data as quickly as possible without having to make too many changes.  The offset of having the rig within the airflow can be quantified and an offset applied to the collected results.




 McLaren MP4-29 The team are utilising a moveable pitot tube array boom behind the front wheel to measure wheel wake.  Also note the small ball mounted in the front wings cascade, these are thermal imaging cameras looking at the front face of the tyre.

 McLaren MP4-29 - As we can see the pitot tube array boom is now in a different position taking measurements of how the wake from the top of the tyres wake will impinge on performance.  Also note in the inset that the team have not installed the 'Wishbone Wings' at the rear of the car to assess performance without them.


 Mercedes WO5 - testing with a pitot tube array behind the front tyre assessing it's wake




 Marussia MR03 with a pitot tube array installed behind the diffuser to understand it's performance



 Lotus E22 - Pitot tube array (fence) mounted behind the front tyre to assess the tyres wake, note how high the fence is to measure much more than the perceived interference it may have with the Sidepod




 Force India VJM07 - Pitot tube array (fence), this large fence is collating data for the whole rear of the car ahead of the front tyre, you'll note that the fence overhangs the floor to measure the effects as air is drawn into and around the tyre and how that could effect floor performance.

 Toro Rosso STR9 - another team using a pitot tube array behind the front tyre to assess the wake from the front tyre. Also note the team are not using the centralised rear wing pylon raced in Bahrain.


 Force India VJM07 - Note that the usual splash of orange on the sidepods is missing from the car



 McLaren MP4-29 from the rear we can see the team have applied flo-viz (blue paint) in order to assess the airflow without the 'Wishbone Wings' covering the suspension











McLaren MP4-29 the team also tried setting the car up with just the lower of the two 'Wishbone Wing' appendages on the suspension




 Force India VJM07 the team have made a minor change adding some small winglets either side of the crash structure to aid in the upwash of the airflow.  This is similar to solutions we have already seen McLaren and Mercedes adopt.


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