Why did 4-time World Champion Sebastian Vettel drive one-handed at Azerbaijan Grand Prix?

Sebastian Vettel of Aston Martin was put in a difficult situation during Sunday's free practice session at Azerbaijan Grand Prix. Vettel was asked by his engineer to drive one-handed, which he did, but t before asking engineer wher he was insane for asking him to let go of steering wheel on a race course. German driver was seen in a video driving single-handedly after being asked to do so by his engineer. 

Here's conversation between Vettel and his engineer: 

"Any way you think you can do safely a bit of video for hands," engineer was heard saying to Sebastian Vettel in a video that has gone viral after practice session on Sunday. 

"What’s that? Sorry, release steering wheel? Are you insane? Okay, I can let go a little bit," Vettel said in his reply to engineer, who asked him to release his hands. 

Why did Vettel drive one-handed at Azerbaijan GP? 

Vettel was reportedly asked to let go of his steering wheel by his engineer because y wanted to film his hands inside cockpit. According to reports, engineer asked Vettel to release his hands as y wanted to do some mechanical calibration ahe of Sunday's final race. 

This isn't first time a driver has been asked to take ir hands off wheel. It was a typical sight for Red Bull drivers in 2010, who h installed a unique tool inside cockpit that allowed car to run quicker, but drivers h to put ir hands over a hole in cockpit to activate equipment called F-Duct. Vettel was with Red Bull at time and h to take his hands off steering wheel on several occasions to eng F-Duct. However, device was outlawed by Formula1 after a few months. 

As far as Vettel's performance in Azerbaijan Grand Prix is concerned, German driver has qualified for final race after finishing 9th in qualifying event on Saturday. Vettel h finished on podium in Baku last season and will be hoping to replicate his performance this year as well. 

Im: Instagram/AstonMartin