so it was n't 100 % accurate -- but we still got a good understanding of the new Pirellis and covered quite a lot of ground . Ferrari 's Fernando Alonso fastest in the second part of the testing for 2011 . Tuesday 's fastest Sebastian Vettel second for world champions Red Bull . But German 's teammate Mark Webber 's lap ends after only 17 minutes . Lewis Hamilton is fourth ahead of the launch of the new McLaren on Friday .
Ferrari 's Fernando Alonso fastest in the second part of the testing for 2011 . Tuesday 's fastest Sebastian Vettel second for world champions Red Bull . But German 's teammate Mark Webber 's lap ends after only 17 minutes . Lewis Hamilton is fourth ahead of the launch of the new McLaren on Friday .