The monocoque -- or chassis -- is the central part of the F1 car. It's vital to performance and also safety, as Mark Priestley, Formula One expert explains to CNBC's Torie Campbell. Subscribe to CNBC International: http://bit.ly/1eiWsDq CNBC's One Second in F1 takes a look at some interesting facts behind the Formula One Motorsport and recounts stories from fans. CNBC.com for more great clips: http://cnb.cx/QXHQOQ CNBC International F1 playlist: http://bit.ly/1knUwsN