Force India's technical boss has given a thumbs-up to the new generation of Formula 1 cars for 2017.

Teams are now hard at work on the new cars, featuring wider chassis, more downforce and significantly bigger tyres.

Asked if the cars will also look more 'aggressive', Force India's Andy Green told Auto Motor und Sport: "Definitely.

"They'll remind you of the cars from the '80s and '90s. It's a good step - I like these cars."

Green also said that the 2017 cars will be much faster than the current ones.

"Early in the season the increase in downforce will be 20 to 25%, but by the end it will be even more - I'm guessing 30 to 35%," he said. "It's the biggest step I've ever experienced."

However, the bigger cars and tyres will mean more drag, which Green says will translate to a 20kph drop on the straights.

He added that the laptimes at a track like the Hungaroring will be slashed by three to four seconds, however, as cornering speeds and braking distances become more impressive.