wrigs wrote:Could one imagine a car that could go through a certain corner at 100 km/h but not 50 km/h, due to it's high dependence on aerodynamic grip instead of mechanical grip?
Is this a trick question?
for interrupting the chitchat about fan cars (how appropriate!) and aerodynamic flow but, at first sight, that would be a very funny corner
...At 50 km/hr and with a 1.5 friction coefficient
(a very reasonable one, by the way) that corner should have a radius of 13 meters.
Ridiculous. Even the corner to enter my garage has a larger radius (altough I concede it has
a large radius for a garage).
I have never designed such a "racing corner" in my life. It's not a corner
: an intersection
has larger minimum radii.
Simple: even a truck cannot go around that curve because of geometric reasons...
The minimum radius in a parking garage
for cars is 7.6 meters (because the rear wheels follow a different path of the frontal wheels and that issue has little relationship with grip: it's a problem of how small is the minimum turning radius of your car with the steering wheel "locked" in one direction).
To give you a general idea, if you consider small cars and try to "squeeze" the radii as much as possible you cannot possibly go lower than 5 meters. Even a Tata Nano (I'm guessing here) has a minimum turning diameter between walls of 9.5 meters, in the name of Enzo Ferrari and Bruce McLaren! (blessed be their souls).
The point is that there are minimum radii to take in account, even if you only consider a curve designed for turning at "zero" speed (let's say, at 1 km/hr)...
Finally, any track is 11 meters wide, minimum (not taking in account infamous tracks like San Marino and its horrible 9 m width). Even if the corner has zero radius
(that is, two straight walls joining at the "curve"), by using the width of the track (outside, apex, outside) you can imagine a trajectory with a larger radius at most tracks, ergo, a larger speed
, and that doesn't take in account the possibility of sliding laterally a bit or going over the kerbs.
Just imagine yourself saying to Alonso that he cannot take a curve a 50 km/hr. Heck, I can take ANY curve at 50 km/hr and I drive a kart! (and a very old one, with perpetually worn tyres and, as you might know, a kart has no wings or, at least, mine hasn't). A Barbie pink bike with sparkling paint, a basket and ribbons in the handlebars can go at 40 km/hr
... at least if you go downhill! I'm sure even
an HRT can do better than that... and I will have mercy and I won't talk about the impossibility of such a large margin like the one mentioned previously: a car at full throttle and another one at half throttle? C'mon, I have been
racing, actually, and let me assure you: the margins are smaller.
I can imagine the talking between the engineer and Chandhok: "Karun, Karun, step in a bit, that little girl in the Barbie bike is holding you back! You can go faster than 50, I assure you! The wind tunnel figures don't lie! Karun, those tires are matched perfect and staggered special"
(á la Days of Thunder..
) "you can do better than her, go, go!"
People.... the way to do engineering (this is NOT science) is checking your ballpark figures in your head EVERY time you're confronted with a riddle.