Barcelona F1 test day three
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Perez moves up to second with a 1m20.914s.
Autosport
Lando Norris says the 2019 McLaren feels "completely different" to its predecessor after an encouraging start to testing. 
Verstappen is back out on the unmarked 'development' tyre, which we learned earlier in the week is a slight variation on the yellow-marked C3 compound.
Stopwatch
Perez moves past Vettel to the top of the times with a 1m20.666s on the C3 tyres.
Fittipaldi improves to a 1m21.714s, still on the yellow C3 tyres.
Bottas, Kvyat, Raikkonen and Verstappen have all joined the track.
Autosport
Part two of our special daily episodes of The Autosport Podcast is now live.
Check out Gary Anderson’s review of yesterday’s running, as our technical expert explains who is looking good and who is struggling more than they seem after two days of Ferrari topping the timesheets.
Kvyat disappoints us with an install lap, while pacesetter Perez also comes into the pits.
Raikkonen has a personal best in the first sector on the C3 tyre.
Verstappen pits after more data has been collected by those huge gate-like sensors on the front of the Red Bull.
Stopwatch
Raikkonen moves to the top of the order with his ninth lap of the day - 1m20.106s on C3 tyres. Bottas moves up to fourth with a 1m21.694s.
Gary Anderson
The Ferrari is circulating with two vertical sensors mounted on each rear wing endplate. The car will have a lot of pressure sensors on the underfloor, the leading edge of the front wing and diffuser and even the rear wing. You are measuring the pressure at those points.
These vertical pitot tubes as far away from the car as practical gives you a reference pressure that you can then use to interpret the other data with. Ferrari used to have a single one on the rollover bar, now it has twin ones mounted on the rear wing.
Barcelona is quite dependent on wind speeds, especially with two straights in opposite directions. So Ferrari is gathering data, seeing where the pressure differentials are, all of which can help you correlate with CFD and windtunnel data.
These vertical pitot tubes as far away from the car as practical gives you a reference pressure that you can then use to interpret the other data with. Ferrari used to have a single one on the rollover bar, now it has twin ones mounted on the rear wing.
Barcelona is quite dependent on wind speeds, especially with two straights in opposite directions. So Ferrari is gathering data, seeing where the pressure differentials are, all of which can help you correlate with CFD and windtunnel data.
Stopwatch
Raikkonen gets under 1m20s next time around with a 1m19.989s.
Bottas is up to third with a 1m20.6s on C3 tyres.
Vettel's on a quick one (by 10am standards).
Stopwatch
We have a Ferrari on top again. Vettel puts in a 1m19.591s on the white-marked C2 tyres.
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Stopwatch
Vettel improves again, to a 1m19.350s on this C2-tyre run, as Raikkonen pits.
Autosport
Antonio Giovinazzi is willing to try to follow Kimi Raikkonen's F1 driving style at Alfa Romeo this year because it would be a "mistake" for him to ignore his team-mate's experience 
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After one hour of day three is in the books, here’s the latest lap count:
Raikkonen 19
Fittipaldi 17
Vettel 16
Bottas 13
Perez 8
Kvyat 8
Verstappen 8
Hulkenberg 7
Sainz 0
Raikkonen 19
Fittipaldi 17
Vettel 16
Bottas 13
Perez 8
Kvyat 8
Verstappen 8
Hulkenberg 7
Sainz 0
Vettel backs off, then tries again with a 1m20.430s, just over a second slower than his best.
Scott Mitchell
There is a lot of pressure on Williams to recover lost ground quickly after missing 25% of the available pre-season testing time. In fact, that number’s rising – every minute that passes nudges the team closer and closer to the end of a third day without the FW42 on-track.
A silver lining of sorts is that two of Williams's likely midfield targets Haas and Racing Point have had flawed starts to testing. Haas racked up 137 laps and Racing Point 109 laps over the first two days, while others have been surpassing that tally in one day alone. So, that’s not perfect – but you’d still much rather be enduring a stuttering programme than one that is still delay.
The minutes must be passing very quickly for the team members working their socks off in the Williams garage to get the car on-track so the attempted recovery can begin.
A silver lining of sorts is that two of Williams's likely midfield targets Haas and Racing Point have had flawed starts to testing. Haas racked up 137 laps and Racing Point 109 laps over the first two days, while others have been surpassing that tally in one day alone. So, that’s not perfect – but you’d still much rather be enduring a stuttering programme than one that is still delay.
The minutes must be passing very quickly for the team members working their socks off in the Williams garage to get the car on-track so the attempted recovery can begin.
Vettel is still circulating in the 1m20s, which means he is catching the DRS-less Hulkenberg on track at the moment. Kvyat is also out there, and to the delight of Jack Benyon, Toro Rosso has left him out rather than doing a series of installation laps. For some reason, those really wind Jack up.
Hulkenberg is being caught by Vettel, but he's still improving on his own best time with a 1m21.489s on C2 tyres.
Hulkenberg finds another tenth to get down to a 1m21.3s, and he's now edging away from Vettel behind him, who was three tenths slower that time by.
Perez improves to a 1m20.134s on C3 tyres, staying third behind Vettel and Raikkonen.
Perez has another go, and puts in a personal best first sector, but he loses a half a tenth in the middle sector and four tenths in the final sector - a clear sign that his rear tyres have already seen better days. The twisty final sector at Barcelona offers a clear giveaway on that front because it places so much demand on the rears in the low-speed traction zones.
Verstappen is back out, having lost his massive aero 'gate' as Gary Anderson called it earlier. He's still on the developmental not-quite-C3 tyres, and hopefully he's about to set his first timed lap of the day.
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Verstappen does indeed set a time on his 11th lap of the morning, going fourth with a 1m20.661s.
Verstappen is a tenth slower next time around, having been a tenth up in sector one, then lost a tenth per sector through the next two. That's maths even we can do.
Fittipaldi is back out, now on the white-marked C2 tyres, and he improves to a 1m20.179s.
Looks like we've got Bottas joining Verstappen on the unmarked developmental tyre too.
More fastest sectors coming from Vettel on another run on C2s. Stand by...
Stopwatch
Vettel gets Ferrari back into its customary 1m18s and instantly backs off, with a 1m18.614s to his name. Another morning, another set of quick laps from Ferrari.
Raikkonen is back on track with a set of the yellow C3 tyres.
Vettel winds up for another push lap, but he's four tenths down on his best from the start of this run. Raikkonen is the man going quickly and lighting up the timing screens now.
Raikkonen gets into the 1m18s, but he can't quite trouble Vettel's time. The Alfa Romeo stays second with a 1m18.944s.
Raikkonen has had his cooldown lap, and he's going for it again.
By: Geoff Creighton
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