rec.autos.simulators

Braking techniques.

Richard G Cleg

Braking techniques.

by Richard G Cleg » Fri, 21 May 1999 04:00:00

: Richard...

: Momentary wheel locking, when braking at the limit, is generally caused by
: surface irregularities or sudden weight transfer that momentarily reduce
: vertical wheel loading. When the locked wheel regains its full vertical
: load, the frictional force at the contact patch increases, causing the wheel
: to spin once again.

  Were that the case, it would be happening to all the drivers.  I'm
sure that does occur - but watch Schumi round a corner compared to the
other drivers.  Perhaps it's not the "rapid pumping of the brakes" that
the poster was talking about - but one of the best drivers out there
today is certainly employing the technique of lock-up and release.

--
Richard G. Clegg     Only the mind is waving
Dept. of Mathematics (Network Control group) Uni. of York.

www: http://www.racesimcentral.net/

Jack Ramb

Braking techniques.

by Jack Ramb » Fri, 21 May 1999 04:00:00

Not necessarily. The closer the driver is to the limit of adhesion, the
smaller the required change in vertical loading to produce wheel locking.

If Schumacher is closer to the limit of adhesion than others (hardly
inconceivable :) ), than he's more likely to produce momentary wheel
locking. And remember that cornering forces generated at the contact patch
reduce the amount of braking force available. So if he's also cornering more
aggressively under braking, the probability of momentary wheel lock is
further increased.

Jack Rambo

www.RaceLive.com/GPaL

Terry Welc

Braking techniques.

by Terry Welc » Fri, 21 May 1999 04:00:00

What you are describing is trail braking, of a sort, keeping the
suspension alive.  In a corner this is a good way to keep the handling
where you want it and stay on the line you need.  However, if you are
doing this under straight line braking, what is really happening is an
unbalance in your front/rear braking setup.  The only way you will not
brake in a straight line is if you are beginning to turn, or if you are
locking one or more wheels.  In SCGT, the default brake setting seems
to favor a loose entry to turns and allows for a quick tap to kick the
rear end out a bit.  If you mash the pedal for any length of time first
the rear locks, then if you brake any harder all four lock.  You can
get no feel for braking pressure from the sim pedal, so you do have
to "hunt for the sweet spot" in the pedal travel.  By keeping on the
throttle during straight line braking you are lengthening your braking
zone, using up more brake than you need to, and having to work harder
to get through the corner.  This applies no matter which of the more
realistic sims you are using.



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Michael E. Carve

Braking techniques.

by Michael E. Carve » Fri, 21 May 1999 04:00:00


%   Sure - I guess it depends on what you define as rapidly...  

Okay, let's say "controlled" rapidly pumping the brakes.   However, the
phrase "pumping" doesn't necessarily bring to mind "control".  Rapidly
modulating the brakes sounds more controlled than rapidly pumping.

--
**************************** Michael E. Carver *************************
     Upside out, or inside down...False alarm the only game in town.

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=<[ /./.  [-  < ]>=-=-=-=-=-=-=-=-=-=-=-=-=-=

John Walla

Braking techniques.

by John Walla » Fri, 21 May 1999 04:00:00

On 20 May 1999 00:43:31 GMT in rec.autos.simulators the following was
written:

Any race-driving instruct who has only "wrong" to say on the subject
of braking techniques would appear to be in the "wrong" job. Being a
race-driving instructor is not a reason for people to believe what is
said, talking sense is the path to that.

Cheers!
John

John Walla

Braking techniques.

by John Walla » Fri, 21 May 1999 04:00:00


That's not "rapidly punping your foot on the brake", that's simply a
standard technique for anyone aspiring to slow down in as short a
distance as possible.

Consider that there is a "perfect" brake position for a given grip
level, one which makes maximum use of the grip you have available
(disregard cornering for now, consider only straight line braking).
The available grip naturally decreases as you slow down, therefore
your "perfect" brake position will gradually ease off. If you "rapidly
pump" the brakes you will constantly exceed (lock up) the grip level,
wasting it, then you will under-utilise the available grip in coming
off the brakes - a very INefficient method of braking. Consider then
too that you are adversely affecting not only the weight transfer but
the airflow also by pitching the car up and own - then add corner
entry into the mix and you've got a massive spin waiting to happen.

Michael's "puff of smoke" comes from utilising the brakes better than
the majority of other drivers, remaining closer to that "perfect"
point just short of lock up. Why he tends to smoke a front tyre more
than most is due to his cornering style, since he unloads the inside
front more rapidly than other drivers during the entry phase,
resulting in it locking up slightly on entry.

Cheers!
John

John Walla

Braking techniques.

by John Walla » Fri, 21 May 1999 04:00:00


>What you are describing is trail braking, of a sort, keeping the
>suspension alive.  In a corner this is a good way to keep the handling
>where you want it and stay on the line you need.  However, if you are
>doing this under straight line braking, what is really happening is an
>unbalance in your front/rear braking setup.

Trail braking is the art of fully utilising the friction circle
concept, smoothly trading off braking grip for cornering grip during
the slow down and entry phase. It doesn't encompass the "on-off"
phenomenon under discussion here except insofar as that could happen
while trail braking.

Cheers!
John

Mark Seer

Braking techniques.

by Mark Seer » Sat, 22 May 1999 04:00:00

And I agree on this point. I'm a professionally qualified road driving
instructor. We always use prise where due and constructive criticism where
necessary. I'm Not having a go here, just stressing that the statement
should have been qualified by an explanation.

Regards

Mark


>On 20 May 1999 00:43:31 GMT in rec.autos.simulators the following was
>written:

>>>>Wrong. As a race driving instructor that's all I have to say.

>Any race-driving instruct who has only "wrong" to say on the subject
>of braking techniques would appear to be in the "wrong" job. Being a
>race-driving instructor is not a reason for people to believe what is
>said, talking sense is the path to that.

>Cheers!
>John


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