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F1 2015 Mercedes W06 hybrid technical specification

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2015 Technical Q&A with Paddy Lowe

What has been the focal point of our learning from 2014?

PL: It’s no secret that reliability let us down on a number of occasions in 2014. Thankfully, over the course of the season overall, this did not fall in an asymmetric way between the drivers – or in a costly manner to our Constructors’ Championship ambitions. But we know we need to up our game. No matter how good things might seem, there is never a scenario where you can afford to leave points on the table. Making a car reliable is a long game and a lot of effort has gone in on that side. It’s not about fixing individual issues but about raising quality across the many thousands of parts and processes involved.

Speaking of reliability, more will now be required from gearboxes in terms of durability. How tough a task is this to achieve?

PL: During the first year of the new Hybrid formula, there were two notable aspects to the rules governing the gearbox. First, there was a ‘joker’ available which permitted teams to change their ratio specification once during the year, which is now lost. This means teams have to pick their ratios for the entire season before Melbourne. Many teams took advantage of the ‘joker’ in 2014 to make performance gains rather than provide an insurance policy – running shorter gears up until Monza before changing to a longer ratio set for the remainder of the season. This won’t present an issue, however, as teams are now familiar enough with the Power Units to set ratios for the season with reasonable confidence.

The more significant change, however, is that previously teams had five opportunities per driver, per season, to change the physical components of the ratios. In effect, this meant that ratio components could be changed halfway through the six race cycle life of each gearbox. This option is now gone, which represents a far more significant change. Teams must now design ratios which will genuinely last six race distances, which has been a key obstacle to overcome through the winter.

The most obvious change, visually at least, comes in the form of the nose. What is the theory behind this change and what else will we see different on the F1 W06 Hybrid?

PL: While it has been widely quoted that regulations governing the noses of the cars have been changed with aesthetics in mind, this is actually misleading. The primary reason for the alteration has been to achieve the original height targeted by rules introduced for 2014. This was, to a greater or lesser extent, bypassed by every team last season, as the regulations were not quite tight enough. The objective behind the regulation itself is one of safety – ensuring compatibility with the range of different impacts that Formula One cars can experience. An example would be contact between the nose and a rear tyre, as we saw when Mark Webber launched into the air at Valencia a few years ago. The required nose height has been achieved by putting in place a number of additional constraints concerning the front nose sections.

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A by-product has been the disappearance of some rather unfortunate looking designs as seen in 2014. Our nose was one of the shortest on the grid in 2014 and, in my opinion at least, one of the most attractive. It remains as such for 2015, albeit a little lower to comply with the new regulation. The core concept is to keep the nose as short as possible, with the mainplane of the wing as far forward of it as possible. This has produced a ‘clinging on by your fingernails’ kind of appearance where the wing attaches to the pillars, which is a big challenge to deliver structurally. Front wing stiffness tests today really do push the limits of engineering – particularly when coupled with the requirements of the front impact test.

The other more obvious visual differences concern the rear wing – which will move to a central, single pylon configuration for structural and aerodynamic reasons – and the external front suspension, which is an even more extreme version of the innovative concept we introduced last year.

And under the covers?

PL: One of the big challenges of 2014 with the new Power Units was cooling – particularly the charge air cooling, which was a significant new element. Now in its second year of evolution, we have been able to go through the analysis loop to find performance through a better optimised solution – the objective being to find the best net performance at the full range of temperatures experienced through a season.

Another technical talking point of last year was the ban on FRIC, which came around quite quickly and unexpectedly. The suspension concept in the W05 was built around the presence of the FRIC system. The W06 suspension system has been designed without FRIC from the outset, which has presented opportunities to re-optimise in this area.

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For all teams – and more notably drivers – weight was a key consideration in 2014. How will this alter for 2015?

PL: When the rules were put together for the new generation of Power Units, it was quite tricky to estimate what weight would be required to incorporate the new systems into a car. The number that was picked was quite aggressive – something which became apparent as the season drew closer. Some teams were content with the previous limit, while others were finding it very challenging. A 10kg increase was agreed only by majority vote, which is why there has been a notice period for the rule to be introduced for 2015. In addition the 2015 tyres are around a kilo heavier than last year due to improvements to the rear construction, so the final weight limit is 702kg – an increase overall of 11kg.

As always, it’s a matter of choosing how best to use the extra weight for the most performance – not necessarily a chance for the drivers to start eating cakes! Saving weight has always been central to the sport – creating efficient structures that are lighter but also stronger and more aerodynamically beneficial. We have put a lot of work into finding those few percentage points on every single component.

On the topic of safety, further changes have now been introduced to provide improved driver protection – talk us through these?

PL: Firstly, the Zylon anti-intrusion panels on both sides of the survival cell have been extended upwards to the rim of the cockpit and alongside the driver’s head. This was an area which was identified as having the potential to be stronger than it has been in the past and these changes will address that. In certain incidents, it will certainly be beneficial to the safety of the driver.

Furthermore, in an additional bid to improve safety, a Virtual Safety Car (VSC) system has been implemented to ensure drivers slow sufficiently under certain conditions. This was successfully trialled during practice sessions towards the end of last season and has now been introduced fully for 2015. It can be used to neutralise a race without having to introduce the safety car itself by enforcing a speed profile to which the drivers must adhere. This addresses one of the pitfalls of waved yellow flags. While drivers are expected to slow significantly in such circumstances – and the stewards will look for throttle lifts accordingly – what constitutes a ‘lift’ can be subjective. These can be very minor and yield little speed reduction. Of course, racers being racers, they will always be inclined to push the boundaries. So, the VSC is a mechanism to manage those mid-range incidents where it will be much safer to force the drivers to stay well within the limits of the vehicle.

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2015 Technical Q&A with Andy Cowell

As we approach the second season of the Hybrid Formula One era, just how impressive was the inaugural year for this revolutionary formula?

AC: Every manufacturer throughout the grid did a fantastic job in 2014 in terms of achieving high thermal efficiency and therefore performance from the fixed fuel flow rate. The numbers speak for themselves. A reduction from 150kg to 100kg of race fuel; downsizing from a 2.4 litre V8 to a 1.6 litre V6 ICE; creating a package that was over 30% more efficient than its predecessor – all within a set of regulations that pushed reliability to the very limit. Race retirements directly related to any element of the Power Unit averaged less than one per driver over the course of the season. Lap times in the final few races were frequently under a second shy of their 2013 counterparts in race trim and less than half a second off in qualifying trim. This was a phenomenal achievement for everyone involved. Everybody has the opportunity to change a significant portion of the Power Unit for 2015 to further improve efficiency and, once again, performance…

How does 2015 differ from 2014 in terms of the challenges faced?

AC: It’s very much a case of evolution rather than revolution in 2015. Where last year was a case of “Can we do it?” we are now faced with a different challenge – “How do we improve it?” We have been working hard on all areas of the Power Unit to increase the conversion efficiency of every single system – trying to make our package more thermally efficient and produce greater absolute power. The focus in this respect has been on combustion efficiency and frictional losses – be they in core parts of the ICE or the ancillary aspects of both ICE and ERS. Development of fuel and lubricants has been critical to this process and we have continued working well with PETRONAS in this respect. There is very significant scope for change under the regulations and significant opportunities to make performance gains, so we have left no stone unturned in our quest for performance – and I am sure that exactly the same is true of our competitors.

What are the main regulatory changes for 2015?
AC: From a Power Unit perspective, there have effectively been two major regulation changes introduced for the 2015 season. Firstly, a maximum of four Power Units are now permitted per driver, per season – a reduction from the five available in 2014. Coupled with an increase in the length of the calendar from 19 to 20 races this presents a significant challenge, with each Power Unit now required to last over 25% longer than before.
Secondly, variable inlet systems are now permitted. The last generation of Formula One engines that were permitted to use such technology were those of the V10 era. This provides an opportunity to optimise the inlet tuning of the ICE against all operating RPM values, thus improving efficiency.

Finally, there has been a clarification of the rules governing engine modifications. Manufacturers now have the opportunity to introduce upgrades to their engines throughout the season – provided they remain within the overall limit of 32 development ‘tokens’ and do not exceed the maximum of four engines per driver, per season. This story has been much debated in the media but, from a regulatory point of view, it presents an equal opportunity for each manufacturer to improve their engine as the year progresses.

This decision hasn’t altered our development strategy for 2015, which was always to gather the necessary data from pre-season testing in order to define and submit the engine specification for the opening race. However, it does offer the opportunity to exploit this interpretation for further gain later in the season, should we choose to do so.

There have been wider changes too in terms of fresh faces and new partnerships…

AC: Indeed. Firstly, we’re all pleased and excited to have another Power Unit manufacturer, Honda, joining Formula One. This is good news for the sport, for the competition, for the fans and for the automotive industry as a whole. We therefore offer them a warm welcome and wish them well. Also, we are very much enjoying working with our new partners at Lotus. We have a great admiration not only for the achievements of the team at Enstone over the years but also for their professional approach to creating racing cars. They are a strong addition to our roster of partner teams and we look forward to working together in the seasons ahead.

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