No, the reason you have them tight is to stop there being any free slack which can see the body accelerated and then stopped against the belts as a sudden jolt - which snaps your neck, a friend of mine died like this because of slack belts while competing, his co-driver walked away with nothing more than bruises.darkpino wrote: ↑24 Jul 2021, 09:56The interesting part is the head and the body, I’ve worked with drivers who had there seatbelts pretty loose (not very safe) and drivers who wanted them as tight as possible. I assume that in F1 as they are all professionals the belts are always really tight so that makes the body pretty much 1 with the safety cell and therefore the force that the safety cell faces is pretty much all the force the body also faces.
You keep the belts tight to remove that free play but the belts themselves stretch a lot in an impact to reduce the acceleration force on the body - it's not uncommon for the belts to be a good few inches plastically deformed after a hard hit, and it's why the regulations for roll over bars and the halo, etc, have such a large distance from the drivers head.