Ferrari 's Fernando Alonso fastest in the second day of F1 testing for 2011 . The Spaniard was quickest on Friday and Saturday, but he has been unable to match his team-mate Sebastian Vettel this week as they have struggled with engine problems during their first two days at Silverstone. But German 's teammate Mark Webber 's session ends after only 17 laps . Lewis Hamilton is fourth ahead of the launch of the new McLaren on Friday .
Ferrari 's Fernando Alonso fastest in the second day of F1 testing for 2011 . Tuesday 's leader Sebastian Vettel second for world champions Red Bull . But German 's teammate Mark Webber 's session ends after only 17 laps . Lewis Hamilton is fourth ahead of the launch of the new McLaren on Friday .