Hamilton: New car completely different

McLaren began 2009 near the back of the pack, before a massive development programme saw the team winning again by the summer, and eventually recovering to third in the Constructors' Championship.

At the unveiling of the MP4-25 today, Hamilton said an incredible effort had gone into ensuring there was no repeat of last year's problems.

"The car looks so much different, completely different, and I feel so proud as I have had some input into it," he said. "I am sure it will handle completely differently to last year's car.

"We have been working on this car for quite some time now. The guys are working flat out trying to build components, develop and improve the downforce and aero efficiency."

His new team-mate Jenson Button agreed that the indications were good for McLaren, although he added that its competitiveness would not be apparent until testing resumes next week.

"We've seen the numbers and everything is very positive, and driven the simulator, but the real work starts in a few days in Valencia," said Button.

Hamilton emphasised that the limited testing mileage available in February would be more vital than ever, with several key rule changes coming in for 2010 and McLaren determined not to start the year behind its rivals again.

"We don't have a lot of testing compared to normal, now we only have seven days each," said Hamilton. "We have a big heavy fuel tank, narrow tyres - hopefully we can maximise each of those days to get as much running as possible and get to the first race in a great position."