Last updated: 26th Feburary 2018 at 11:30
Force India and Toro Rosso have today shown off their 2018 contenders, just as testing at Barcelona commences.
Force India will be hoping to keep up the momentum of their recent success in Formula 1, with the Silverstone-based team finishing forth in the constructors' championship both in 2016 and 2017. Their high success compared to their low budget gives Force India one of the best points-per-dollar ratio of the whole grid.
The VJM11 is an evolutionary follow on from the 2017 car, with the new machine following the design trends that we're seeing this year - primarily the 'half shark fin', and the sidepod inlets being small for aero's sake. The new car also retains Force Indias trademark unique nose design.
Power will be courtesy of Mercedes once again this year, which, historically, has proven very reliable for the team. Has Force India done enough to keep the competition at bay this year?
Toro Rosso's new car marks the start of a new era for the Italian team. Although the livery has remained the same, the team has made a radical switch to Honda as an engine supplier for 2018.
It comes after the team had a very public fallout with Renault towards the end of the 2017 season; Toro Rosso will be wanting things to get off to a smooth start with their new power unit to keep them competitive in the midfield.
The STR13 does not feature any wild or unique looking aero devices compared to some other teams in the pack, but that doesn't stop Toro Rosso from continuing to develop the car all the way up until the first race later in March.
Have Honda managed to shake away all the issues it had with McLaren, and provide STR with a solid power unit? Only time will tell.
McLaren - 23rd February
McLaren have radically switched up their livery once again for their new Formula 1 car, the MCL33, which they hope will climb the team back up the ranks.
The distinctive Papaya orange and blue combo will strike the nostalgia section of long-term Formula 1 fans' hearts, who will remember that this was McLaren's livery in the 1960s and into the 70s. Last year's car was indeed orange as well, but it wasn't the 'authentic' shade.
Paint job aside, visually the MCL33 looks fairly similar to its predecessor - though that's not such a bad thing, since the MCL32 arguably had one of the most complete chassis on the grid towards the end of the 2017 season. The Halo has been painted black here, which allows it to blend in a lot better into the background than other teams' efforts.
As has become the rule rather than the exception for this year's flock of cars, the sidepod inlets are positively tiny for the MCL33, as is the airbox above the driver's head. The teams must've figured out a very efficient method of cooling the power units without creating big, draggy holes in the cars for this year.
Anything else performance-wise remains a fingers crossed situation for McLaren fans, as they await to see if the Renault unit performs, and McLaren can keep up its chassis sophistication against other teams. The Woking team will be hunting hard for podiums this year, and hopefully the MCL33 is the car that will deliver the goods.
Scuderia Ferrari - 22nd February
Ferrari showed off their 2018 title contender, and while it does represent an evolutionary move onwards from their 2017 efforts, there are some interesting details surrounding the SF71H that Ferrari will hope will give them the edge for this season.
The most eye-opening thing about the new car is that Ferrari have managed to find a small loophole with regards to the banning of the T-wing, since the SF71H still has one. Look just below the spoiler in the official press image, and you'll see it hanging horizontally. This suggests that Ferrari have found a way to obey the new development exclusion zone set by the FIA - if it proves aerodynamically successful in its new lower position, expect other constructors to quickly mimic.
Other noteworthy things about the new car is just how small the sidepod openings are for the 2018 car. Ferrari surprised everyone with compact sidepods in 2017, and for this year they have taken it one step further. Smaller holes in the car will naturally lead to cleaner, more efficient cuts through the air, but the Scuderia has to ensure the power unit still receives enough cooling.
There is a fair bit more red on the car this year as the Santander sponsorship concludes, although the big blank red space on the side of the airbox suggests space for a new major sponsor in the future. The Halo has been decorated with a Ferrari logo, and has minor aero elements.
Perhaps the SF71H's biggest challenge won't be aero, but how the power unit performs this year - especially reliability-wise, considering there are only three power units allowed for the entire season now. It was a decade ago since Ferrari last won the constructors', so the Maranello team will be pushing hard for success in 2018.
Mercedes AMG Petronas - 22nd February
Modern Formula 1 titans Mercedes AMG Petronas revealed their 2018 contender at Silverstone on 22nd February, named the W09, which they hope will pave their way to a fifth constructors' championship in a row.
Although at an initial glance the car looks fairly evolutionary and conservative, there are some notable differences from the revealing. The 2018 car has a noticeable higher rake (the rear of the chassis sits higher than the front), which is an approach that has been championed by Red Bull for a couple of years now.
The rear package of the car is also now incredibly tight; if Mercedes can keep cooling under control with such a small breathing space for the internals, they could have a huge aerodynamic advantage over competitors.
Other than that, changes are more expected. The Halo has appeared, of course, and the shark fin and T-wing has been removed, as per regulations. The power unit is nothing radically different, but expect some evolutionary improvements from last year in terms of power, efficiency, and reliability.
The biggest issue with last year's car was how finicky it was on some tracks; remember Hamilton at Monaco? Mercedes will be hoping the new W09 will be a more consistent performer to give themselves the luxurious breathing space they had gotten all too used to.
Renault Sport - 20th Feburary
Renault showed off the first look at their car for the 2018 season on the 20th February, the R.S. 18, which they hope will continue their upward trend of points gathering throughout the F1 seasons.
Although just a render at this stage in time, this is the first time the public have been given a good look at what to expect from Renault in 2018. Most notably, there is more black on the car than there was last year. On that subject, Renault have appeared to master the increasingly common 'black Halo, black photo background technique', too.
Colour aside, the car looks fairly conventional from what we've seen from other constructors so far this year. There is no weird-looking sidepods or aero-ridden Halos, and the bargeboard area looks relatively simple as well. However, there is still several weeks of development to go yet before the teams race in Melbourne later in March.
Jérôme Stoll, President of RenaultSport Racing, claims that the team "ended the year with the fourth fastest car." The team finished in sixth position in the constructors, and the Enstone-based team will be hoping for another jump up this year. However, they will be facing stiff competition from the likes of Force India, McLaren, and potentially even Williams with their new Paddy Lowe-desgined car.
Renault will be thirsty for podiums this year, but will the car be as racy as it looks on track?
UPDATE: Renault has confirmed that the render shown to the public was "coy", after suspicion arose surrounding its basic aero elements. Renault have gone on to say that the image is "a taste of what's to come, to wet your appetite ahead of next year's testing." So much for that being a proper car reveal then...
Alfa Romeo Sauber - 20th February
The Alfa Romeo Sauber F1 team showed off the radically different C37 2018 contender to the public for the first time on the 20th February.
Sauber will be hoping this new partnership with Alfa Romeo will push the team forward through the pack once again, after a succession of poor-performing seasons in recent times from the Swiss-based team.
The partnership with Alfa gives Sauber a closer relationship with Ferrari. As a result, the C37 will be using the latest 2018 Ferrari power unit, unlike the C36, which had to make do with a power unit that was a year out of date, with no upgrades throughout the year.
Visually fans are divided with the new lick of paint, with some calling it 'bland', while others have labelled the new machine as 'sexy' on news aggregation site Reddit.
Notable talking points about the new car include the Halo, which has subtle aero elements built into it, and the sidepod is interestingly split into two intakes. Aerodynamically the car looks significantly more sophisticated than last year's C36, but isn't quite up to the levels of this year's Red Bull RB14, especially round the bargeboard area.
Will 2018 be the year Sauber stops being the backmarker once again?