Effects of increased weight and inertia on tyres

[lebesset]

well actually , according to HH of bridgestone , they have very little influence , and as he is speaking a foreign language we should surely forgive him for this slip

but more importantly he talks about the weight of the cars :
to my shame when I read of the big increase in car weight this year with maybe another 100Kg of fuel I accepted what the press said without thought ;

but HH points out that with the weight of the car and perhaps 2,000 Kg of downforce the 100Kg extra fuel is not a big increase

but he also points out that the increase of the inertia is more important , something that I haven't seen mentioned elsewhere

[autogyro]

You do not get inertia from DF do you.
Hmmm

[lebesset]

I presumed that was his point
increase in weight maybe 5%
increase in inertia maybe 15%

I wasn't on the design side of the tyre industry and there are no ETRTO figures regarding inertia , so I can only presume that road vehicles are taken as having zero downforce ! sounds about right to me

[Mr Alcatraz]

I can see lebesset's (or HH’s) point here. In this case DF, and inertia are mutually exclusive.
In a perfect F1 world every contender has his car set-up to use the DF to give maximum grip when cornering.
However F1 cars lose grip even in the best hands around corners, and just the least little bit of yaw in combination with the inertia of a car with much more mass will exacerbate any input errors by the pilot.

@ lebesset it's a good Idea to include a link when quoting my man