Barcelona F1 test day two
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Sauber's sensor of the morning is a large rearward ice-scraper

Snow clouds?
You can't simulate that range of conditions, you just have to run for the temperature as it is. And that can mean running a lot of blanking on the radiators to avoid over-cooling, which affects the airflow. The variation in temperature also affects the aerodynamic flow of the car both inside the bodywork and externally.

Strict Mercedes crew member insists to Bottas that he absolutely has to go out there even though it's cold (Sutton Images)
Bottas 4; Leclerc 3; Vandoorne 2; Everybody else: 1

Wide variety of different tyres being tried this morning - we've seen intermediates, softs and mediums used to try to grapple with conditions today. Force India, however, went ultra-soft, but not quite to the hyper-softs that would match its pink livery (Sutton Images)
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Usually, you will have highlighted the things that you must get done, then you will have other things you will like to get done. You need to make sure you get through the key things and hopefully you get the rest done too.
So when you hear someone saying they got through their test programme with an hour or two to spare, you know they really have had a good day.

McLaren's entry in the outlanish aero sensor carnival (Sutton Images)

A close-up look at the side aero detail on the new Red Bull while Max Verstappen is in the pits (Sutton Images)

There's not a lot of grip on track when it's this cold, as Leclerc has already demonstrated (Sutton Images)


Another 'first look' for this morning - Sebastian Vettel in the 2018 Ferrari (Sutton Images)
The morning might be spent doing aerodynamic runs, getting data on things you looked through last night and what to learn about. By late morning, you'll start to see people chucking in decent lap times and experimenting with set-up so you know how the car responds when you get to Australia.
You have limited time on a grand prix weekend, and if a car's doing 'x' you want to know you can do 'y' and get an improvement. It's easy to fix problems, but not necessarily make the car go faster – what you want to do is fix it and make it faster.
You might even experiment to the extent where you put on too much front wing to make the car more pointy even if it makes it more difficult to drive. This is something you might want to take a risk on on a race weekend, so you want to know how it responds.

Toro Rosso goes for a large sidepod snow radar (Sutton Images)

Sensor watch: clearly a gigantic thermometer attached to Bottas's Mercedes this morning (Sutton Images)
That's what GIORGIO PIOLA AND MATT SOMERFIELD have been doing for motorsport.com's tech developments photo feature from day one:


A first look at Charles Leclerc in the Alfa-branded Sauber (Sutton Images)
By: Geoff Creighton