Red Bull chief designer Adrian Newey says he's relished the challenges set by the new Formula 1 technical regulations and has his say on what his rivals have produced from pre-season testing.

Christian Horner, Red Bull team principal, says Newey 'has his mojo back again' thanks to the freedom given in the 2017 F1 technical regulations as the British designer has split his time between heading up the RB13 development alongside his commitments to the new Aston Martin-Red Bull supercar.

Newey has explained the rule changes have not been as drastic as the last serious overhaul of aerodynamic and chassis rules from 2009 but they have posed their own challenges.

"It is fair to say that the rule changes are much smaller than we had in 2009 aerodynamically, the flow structures around the car are similar to previous generations but obviously different in exactly what happens," Newey said. "Particularly the 250 vortexes off the front wing which is the junction between the FIA section and the elements.

"How that interacts with the car is quite a challenge. Meeting the weight target despite it being 728kg is a challenge. It's getting towards sportscar weight.

"I think it makes a more interesting approach having more freedom, this is the first time in quite a few years we have a bit more freedom in the bodywork restriction regulations. The most obvious thing is a wider car with wider bodywork, I think interestingly the removal of the exclusion boxes around the barge board area is an area which gives a lot of opportunity."

Newey is also keen to get an understanding of Red Bull's rivals cars, with a particular focus on F1 world title rivals Ferrari and Mercedes, with the two teams grabbing the headlines during pre-season testing in Spain while Red Bull enjoyed a low key approach.

"The Mercedes looks like a complicated car, it's got a lot of parts on it which will be about trying to manipulate the vortices to position the flow structures around the car," he explained.

"The Ferrari has a complicated looking sidepod which I have not quite managed to work out yet from the pictures I have seen.

"Mercedes and Toro Rosso have gone for a higher top wishbone which kind of looks like a Lotus 49, with its inboard high king pin, which I would imagine is aimed at trying to get the bottom wishbone higher and trying to get the top wishbone higher and to clean up the brake duct area. Those are the biggest differences I've seen so far."

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