The new FW26 is the result of 250,000 working hours

The radical new car features a twin-keeled front-end design such as has never been seen in the sport before.

However, technical director Patrick Head has warned against over confidence with the car yet to undergo intensive testing in Jerez.

Williams have not won any silverware since 1997, when they took both titles.

But Juan Pablo Montoya confirmed his commitment to the Williams despite announcing in November that he will be joining McLaren in 2005.

Williams launch in pictures

"We're here to win and I will do whatever I can to win whether I have to beat a McLaren or a Ferrari," the Colombian said.

"We have a realistic chance of winning the championship and nobody in the team wants to throw that away," he said.

"As long as I'm in a Williams car and am a Williams driver I will feel part of the team and I'm 100% committed to winning."

On unveiling the new car, Head admitted Williams were due a championship win after years of under-achievement.

We've been around long enough to know we have to see how it runs on the track Patrick Head on the FW26

"This has been the longest period in Williams' history without a championship and everybody is determined to correct that," he said.

"The ambition is to achieve something we have not done since 1997 and our target is quite clearly both championships.

"If the latest car you produce is not the best one you have quite serious problems, but we have got to be careful about coming out with too many superlatives until we run the car.

"The results in the wind-tunnel give the new design a clear advantage; otherwise we would not have gone with it.

"But we have been around long enough to know we have to wait until we see how it runs around the track."

Montoya, along with team-mate Ralf Schumacher, faces a period of intense testing in the new FW26 prior to the season-opening race in Australia on 7 March.

And Schumacher, who has enjoyed a chequered relationship with Montoya, is sad to see his team-mate go.

"It's a shame and I'm honest about that," the German said. "We have developed a good team together over the last couple of years.

"The FW25 did not have a very good impression, but we developed it into a good car.

"We just did not have enough time and I hope we will not have to go through that with the FW26," he added.