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Many individuals on Twitter seemed on the instantaneous (Picture 1) BEFORE the crash by ALO and observed, “wait, was the outer wheel turning MORE than the inside?!?” The reply is sure, and it’s one thing peculiar to F1.
The inside tyre travels alongside a shorter path when cornering, being nearer to the flip centre. Consequently, automobiles have a so-called ‘Ackermann steering geometry’: when turning the steering wheel, the inside tyre will flip greater than the outer (Picture 2). That is NOT what occurs in F1.
In F1, efficiency is the objective: an Ackermann steering minimises tyre slip, limiting put on, however isn’t perfect for efficiency. In reality, a tyre should slip laterally to provide a cornering pressure. The quantity of slippage that maximises grip will increase because the tyre load will increase (Picture 3).
When cornering, the ‘centrifugal’ pressure strikes a part of the load of the inside tyre to the outer. Thus, the outer tyre should slip greater than the inside tyre to maximise grip. That is carried out with an ‘Anti-Ackermann’ steering, the place the outer tyre turns greater than a extra typical Ackermann steering.
F1 brings this to the intense: the extent of Anti-Ackermann is so excessive that the outer tyre turns MORE even in comparison with the inside tyre! (Picture 4). This worsens the wear and tear however improves the lateral grip. The previous isn’t a giant deal in circuits like Monaco, whereas the latter is essential.
How do I learn about this? I used to be the top of Suspension & Dynamics of my native Components SAE staff. We selected an anti-Ackermann geometry for our automobile too! (Picture 5) Not as excessive as in F1, although: the inside tyre nonetheless turned extra, however much less so than with an Ackermann geometry.
That is one thing that usually confuses folks…I hope that now the idea is clearer! I might be comfortable to answer your feedback. Discover me on Twitter (https://twitter.com/F1DataAnalysis) and Instagram (https://www.instagram.com/f1dataanalysis/) for additional evaluation! Should you like these posts, help the web page (and request customized analyses!) right here: https://www.buymeacoffee.com/F1DataAnalysis
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