Când mă refeream la depășire, mă refeream la cea făcută de cel care filma. Manevra de revenire a fost făcută cu 136 km/h. Poate că nu era atât de multă apă ci doar ștergătoarele erau inadecvate iar viteza lor prea mare.
Cred că studiul de mai sus, făcut cu un Michelin Symmetry, all season, arată scăderea DRAMATICĂ de aderență la creșterea vitezei, la 130 km/h. Ai jumătate din coeficientul de frecare.
Referitor la manevra pe care a făcut-o când i-a evitat pe berbecii care bagă botul, m-am uitat cu atenție și omul s-a asigurat, ba chiar a așteptat 4 secunde să treacă cineva de pe banda 1 și apoi a plecat în siguranță. Eu îl critic doar pentru viteza de 136 km/h pe asfalt ud, cu nevasta în mașină.
The Results
The first series of tests undertaken were for braking friction levels - these results will be either identical (or at least indicative) of acceleration performance as well. As vehicle speed rose, the grip provided by the tyres decreased - it really does make sense to drive more slowly in wet conditions.
With a water depth of just 1.3mm a new 215/75-15 (no we don't know why such a high profile tyre was picked, either!) Michelin Symmetry tyre dropped in frictional coefficient from just under 1.2 down to 0.6 as speed rose from ~30 km/h to ~130 km/h. So, a brand new tyre with a tread depth of 7.9mm had around half of the braking and acceleration grip at high speed on a wet road than it had at slow speeds!
And if a brand new tyre was that bad, what about a worn tyre? With the tread of the same tyre reduced in depth to 1.6mm, by 100 km/h the longitudinal peak frictional coefficient had dropped to 0.1 - basically, the tyre had no grip at all. Even the gentlest braking would result in wheel lock-up. And you didn't think that a tyre with 1.6mm of tread depth was dangerous?
The first series of tests undertaken were for braking friction levels - these results will be either identical (or at least indicative) of acceleration performance as well. As vehicle speed rose, the grip provided by the tyres decreased - it really does make sense to drive more slowly in wet conditions.
With a water depth of just 1.3mm a new 215/75-15 (no we don't know why such a high profile tyre was picked, either!) Michelin Symmetry tyre dropped in frictional coefficient from just under 1.2 down to 0.6 as speed rose from ~30 km/h to ~130 km/h. So, a brand new tyre with a tread depth of 7.9mm had around half of the braking and acceleration grip at high speed on a wet road than it had at slow speeds!
And if a brand new tyre was that bad, what about a worn tyre? With the tread of the same tyre reduced in depth to 1.6mm, by 100 km/h the longitudinal peak frictional coefficient had dropped to 0.1 - basically, the tyre had no grip at all. Even the gentlest braking would result in wheel lock-up. And you didn't think that a tyre with 1.6mm of tread depth was dangerous?
Referitor la manevra pe care a făcut-o când i-a evitat pe berbecii care bagă botul, m-am uitat cu atenție și omul s-a asigurat, ba chiar a așteptat 4 secunde să treacă cineva de pe banda 1 și apoi a plecat în siguranță. Eu îl critic doar pentru viteza de 136 km/h pe asfalt ud, cu nevasta în mașină.
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