rec.autos.simulators

F1C - YOU MUST DO THIS!!!

Jan Verschuere

F1C - YOU MUST DO THIS!!!

by Jan Verschuere » Sun, 06 Jul 2003 02:49:28

There's the rub as far as the ISI way of going about things goes. You can't
have sometimes this, sometimes that because they simulate what happens to
the centering force with a fixed effect, rather than derive the values for
the FF directly from what happens at the tyre contact patch. That saves CPU
on the model and complexity in the trackbuilding (don't have to model the
actual ridges on the kerbs). That also means any push or pull also acts on
flat kerbs, which shouldn't display this characteristic, but like I said...
can't have your cake (performance) and eat it (everything correctly
simulated) this way.

If you imagine a straight piece of rather steep kerb . Running two wheels on
it while driving parallel along it you will feel a slight pull due to the
"normal" force (reaction force to the car's weight) not acting normal to the
the car (because that's tilted). That's the same principle as why a
banked turn helps cornering.
As soon as you put force into the kerb by turning into it, though, it will
push back
with a far greater magnitude than your "steady state" pull. Ergo, there may
be cause for a slight pull, but in practical situations this never really
arises. Perhaps when just grazing a curb like you explain, but in most
instances we're going into them to avoid having to go around them and drive
a tighter radius. When driving over a kerb, we're compressing the suspension
and the tyre and the car would rather go straight on anyway, so any force
felt in the steering wheel should be against de lock we hold on it, not pull
the steering further in, IMO.

So, yes, from my personal experience with kerbs (not in single seaters, let
alone F1, but anyway) I'm pretty sure I'm feeling what I'm supposed to be
feeling most of the time. Let me know how the karting went tho'.

BTW: none of this has any effect on steep kerbs spinning one out in fast
bends. I think factors like differential lock and the inside rear thread
beying lifted off the ground play a much bigger roll than FF settings in
this situation.

Cheers,

Jan.
=---


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