rec.autos.simulators

simultaneous throttle and brake

Joachim Trens

simultaneous throttle and brake

by Joachim Trens » Tue, 02 Sep 2003 02:58:09

Ohhhh don't try to open a new battlefield now as this would only take us
into the old and unsolveable controller discussion again :-)

The assertion (made here and elsewhere regarding this topic) this article
proves incorrect is that this driving technique is unrealistic because it
would damage a real car so quickly that it couldn't finish a race.

The article shows that this assertion was incorrect, and that in fact this
driving technique is used by good drivers, and that the car very well can
finish a race with this.

Neither you nor I want to start discussing about controllers again, I
think, because it would inevitably culminate in the old argument that you'd
need to apply yourself a deadly electrical shock after a simulated fatal
accident to have real realism... ;-)

Achim

...
...

Gerry Aitke

simultaneous throttle and brake

by Gerry Aitke » Tue, 02 Sep 2003 03:20:14


> Well, unless that hotlapper technique people criticize is something
> completely different from what is being described for Schumacher, it is
> perfectly realistic. It's perhaps harder to do with a 3-pedal setup, but for
> example Walter Roehrl also said he was using it.

> I've always wondered why some say this technique isn't realistic. I've even
> tried it myself in cars and carts (while I was still slender enough to drive
> carts fast <g>) and while I wasn't getting anywhere with it in 3-pedal cars,
> it worked well in carts. I've AAMOF always thought that _everybody_ is usung
> this technique, until I read about it allegedly being 'unrealistic' here.

Hi Achim

Hehe, go on then, can you talk me though how this would work in a Lotus 49?

I'll set the scene:

You are approaching T6 at Silverstone, you just snatch 5th, give it a
squirt, and it's time to brake.

Now, over to you...

--

Gerry Aitken

...and a friend shall lose a friend's hammer -- Book of Cyril, chapter
6, verse 16

Sean Higgin

simultaneous throttle and brake

by Sean Higgin » Tue, 02 Sep 2003 03:22:00

The article I have in F1 Racing magazine also states that Rubens is a RIGHT
foot braker, where Schuey is a left foot braker.

--
Sean Higgins

My Trans Am pics
http://www.racesimcentral.net/~higpup/

My Ferrari pics
http://www.racesimcentral.net/~higgy/




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

> > An interesting German article, mentioning that Schumacher uses throttle
> and
> > brake at the same time. Particularly interesting for this particular
topic
> > are paragraphs 3,4 and 5.

> > Achim

> Very, VERY rough translation from Babelfish:

> (F1Total.com) - over the last years Michael Schumacher again and again
> proved its exception position in the formula 1. The Ferrari pilot belongs
to
> the best Formel-1-Fahrern of all times and not without reason, as the
> specialized magazine could point ' F1 out Racing ' now in a unique
analysis.
> One could show on the basis telemetry data of the Italian Formel-1-Teams,
> how the German deals unbelievably sensitivly and flexibly with gas and
brake
> pedal. Particularly impressing the comparison is on the basis the data of
> the 180-Kehre in Suzuka, a distance, on which Michael Schumacher exceeds
> again and again over itself. In principle Rubens Barrichellos style of
> driving affects compared with that one from Schumacher the telemetry data
> "simply" - "Rubinho" is now real no bad driver. The Brazilian rises before
> the curve 15 meters in former times to the brake and gives above all
either
> gas or brakes. With the world champion looks completely differently.
Michael
> Schumacher stops clearly longer fully on the gas than Barrichello, but
> begins it however before the actual "correct" braking for the hairpin
curve
> the car with an employment of the brake from only five per cent to to
> stabilize. In the curve goes to Barrichello fully from the gas, Schumacher
> gives however constantly gas and "plays" with brake and gas, in order to
get
> the car as fast and stably as possible around the curve. Even in the exit
of
> the curve Michael Schumacher uses the brake. While Rubens Barrichello
tries
> to prevent the car by removal of gas from breaking out the German gives
> substantially more gases and counterbalances its Ferrari with easy
braking.
> Alone in this curve is the champion 25 kilometers per hour faster on the
way
> than Barrichello, which loses 0.3 seconds. Apart from the fact that Rubens
> Barrichello brakes either or gives gas and quite frequently both pedals
> parallel uses Michael Schumacher in contrast to it, a further difference
is
> noticeable. Thus Schumacher applies brakes gently a curve mostly later and
> stabilizes the car, in which he gives further easily gas, what works at
> first sight counter productive, but but ensures that Schumacher can brake
> later, without control of his car to lose and cleanly give in can. While
> Rubens Barrichello applies brakes gently, speaks a curve nearly "linear"
> first strong pressure on the brake pedal constructs and this then
> continuously lowers, in order to avoid a blocking of the front wheels,
> Schumacher in the braking reduces briefly the brake pressure, in order to
> lend to the wheels again more adhesion. Thus Schumacher brings more in
into
> the hairpin curve of Montreal with 15 kilometers per hour than
Barrichello.
> And during Schumacher before the apex five meters at all no gas are, are
> there with the Brazilian of ten meters. But everything is not gold which
> shines. Thus Michael Schumacher with its driving fashion stresses the
> material more strongly than Barrichello. The front tires are more strongly
> loaded, because Schumacher brakes more strongly and faster in-driven into
> the curves. This caused in some past running that the Kerpener could not
> drive with the softer tire mixture, Rubens Barrichello however already.
Also
> the brakes and the engine are more strongly loaded, because Schumacher
> brakes at the same time and gives gas. And also gasoline consumption might
> be higher with Schumacher by this fact than with the Brazilian. But if it
> comes *** hard, as in Montreal, when the brakes over their limit were,
> Michael Schumacher can change its style of driving over completely and
> preserve the brakes thereby. That constitutes evenly a genuine world
> champion.

Gerry Aitke

simultaneous throttle and brake

by Gerry Aitke » Tue, 02 Sep 2003 03:26:10


> Ohhhh don't try to open a new battlefield now as this would only take us
> into the old and unsolveable controller discussion again :-)

> The assertion (made here and elsewhere regarding this topic) this article
> proves incorrect is that this driving technique is unrealistic because it
> would damage a real car so quickly that it couldn't finish a race.

Was this assertion made in the context of a lotus 49?

--

Gerry Aitken

...and a friend shall lose a friend's hammer -- Book of Cyril, chapter
6, verse 16

EGK

simultaneous throttle and brake

by EGK » Tue, 02 Sep 2003 03:43:33

I was just giving an example with a specific circumstance.  Unless you have
three feet, it's impossible to stop on an incline and  keep yourself from
drifting back into the car behind you without doing that.  You have one foot
on the brake, one foot on the clutch.  Soon as you take your foot off the
brake to put it on the gas, you start to coast backwards.   You can be real
quick and gas it and pop the clutch but for that split second you're still
going to drift and if another car is on your bumper, you can easily hit
them.

Just up the street from me is a stop sign at a busy intersection.  It's also
on a fairly steep incline and with cars parked on the street it's hard to
see what's coming.  If you stop there with a manual transmission and anyone
stops right behind you, it can be very hard for inexperienced drivers.
Lots of people are smart enough not to stop 6 inches from someone's bumper
on an incline but we all know not everyone is smart.  :)



>Do that too much and you will burn out the clutch



>To avoid that you can feather the gas and clutch together to
>> maintain your position.

----------------------------------------------------------------------------

"There would be a lot more civility in this world if people
 didn't take that as an invitation to walk all over you"
                   - (Calvin and Hobbes)

Gerry Aitke

simultaneous throttle and brake

by Gerry Aitke » Tue, 02 Sep 2003 03:51:38


> I was just giving an example with a specific circumstance.  Unless you have
> three feet, it's impossible to stop on an incline and  keep yourself from
> drifting back into the car behind you without doing that.  You have one foot
> on the brake, one foot on the clutch.  Soon as you take your foot off the
> brake to put it on the gas, you start to coast backwards.   You can be real
> quick and gas it and pop the clutch but for that split second you're still
> going to drift and if another car is on your bumper, you can easily hit
> them.

> Just up the street from me is a stop sign at a busy intersection.  It's also
> on a fairly steep incline and with cars parked on the street it's hard to
> see what's coming.  If you stop there with a manual transmission and anyone
> stops right behind you, it can be very hard for inexperienced drivers.
> Lots of people are smart enough not to stop 6 inches from someone's bumper
> on an incline but we all know not everyone is smart.  :)

That's why we have handbrakes. Slipping the clutch like that WILL reduce
it's life.

--

Gerry Aitken

...and a friend shall lose a friend's hammer -- Book of Cyril, chapter
6, verse 16

P-Nut

simultaneous throttle and brake

by P-Nut » Tue, 02 Sep 2003 05:02:09


Sometimes I perform hill starts in RL (manual transmission) by holding my
right foot at an angle across both the brake and accelerator, and my left
foot on the clutch.  To move off, I engage the clutch while shifting the
right foot's pressure from brake to accelerator.  If I'm not going to be
stopped for very long I find this less effort than using the handbrake.  It
doesn't burn out the clutch, and I don't roll backwards.

I always right-foot when driving as I my left foot doesn't seem able to be
gentle enough with the brake pedal alternately with pushing the clutch pedal
all the way down for gear changing.

But in GPL and F1C I left-foot brake, since I only have two pedals attached
to my computer.  Applying the brake and accelerator simultaneously in F1C
does seem to help in some corners, but some care is needed as brakes
overheating and wearing out can be a problem if you are too aggressive
(particularly if the maximum brake pressure is set fairly high, and the
brake cooling ducts are a bit small).  I suspect quite a lot of different
driving styles can be optimized by adjusting brake balance and differential
lock.

GPL doesn't seem to have any brake wear modelled (correct me if I'm wrong),
so perhaps this technique can be exploited beyond what is realistic in GPL.

Scot

simultaneous throttle and brake

by Scot » Tue, 02 Sep 2003 05:31:56

I have always used the brake and accelerator together. Works very well in
LFS, GPL and Go-Karts. I have always found it very natural when Sim
racing. I always left foot braked from the first wheel I bought, it just
felt 'right'. For some reason I never ever could left foot brake in a road
car.

It's definitely much faster and very good to get the balance right...

Scott
Green Flag Racing
www.green-flag.com

Joachim Trens

simultaneous throttle and brake

by Joachim Trens » Tue, 02 Sep 2003 06:02:54

You would remember that better than I do, wouldn't you ;-)

Achim


...
...

Joachim Trens

simultaneous throttle and brake

by Joachim Trens » Tue, 02 Sep 2003 06:04:31

Amazing, you're repeating yourself :-)

Achim


...
...

Gerry Aitke

simultaneous throttle and brake

by Gerry Aitke » Tue, 02 Sep 2003 07:26:48


> You would remember that better than I do, wouldn't you ;-)

> Achim

It wasn't. No assertion was made about modern F1 driving. I was talking
strictly about 67.

--

Gerry Aitken

...and a friend shall lose a friend's hammer -- Book of Cyril, chapter
6, verse 16

Haqsa

simultaneous throttle and brake

by Haqsa » Tue, 02 Sep 2003 07:31:36

It is still open to question whether this is a good thing to do in a real
race, where fuel mileage and brake life could be important.  Yes I know MS
is doing it and he can be quite fast and he has xx world championships but
that still doesn't necessarily mean it's a good thing to do.  The question I
have is whether the faster laptimes are offset by having to carry more fuel
or pit more often.  Who is to say other than the teams themselves?  For all
we know MS could still have won all those races by driving with more normal
technique.  Note too that this year he has frequently been outqualified.
Has he slowed down, or is it because he has to carry more fuel?  Not long
ago during a Trans-Am race I was watching, Derek Daly made the comment that
they had made a lot of study over the years about how to conserve fuel, and
the only thing which really worked was to get off the throttle a little
earlier on the way in to a turn.  If you are overlapping gas and brake you
are burning more fuel per lap.  Depending on the type of race and the pit
strategy employed, you might get away with it and you might not.

As for it working in karts, I guess it depends on what class.  The lower
classes have rear brakes only, so overlapping throttle and brake is
pointless.


jason moy

simultaneous throttle and brake

by jason moy » Tue, 02 Sep 2003 07:38:20

On Sun, 31 Aug 2003 19:26:10 +0100, Gerry Aitken


>Was this assertion made in the context of a lotus 49?

According to some quote by Colin Chapman (which unfortunately I can't
find atm) he never had a driver whose cars exhibited less wear than
Jim Clark's.  Apparently if something on the car failed, or if he
needed a new tire or brake installed, he was genuinely embarrassed by
it.  Which probably tells you something about the way he drove.

Jason

Gerry Aitke

simultaneous throttle and brake

by Gerry Aitke » Tue, 02 Sep 2003 07:41:21


> Amazing, you're repeating yourself :-)

Modern F1 cars, and the techniques used to drive them, had nothing to do
with what we discussed here about GPL.

The fact is, you cannot drive like that in a real lotus 49. So doing so
in GPL is unrealistic.

It works well in karts though, I should know, I've driven enough of
them! MS and the current crop came from kart racing, and brought these
techniques with them. F1 cars today are designed around this technique.
The technology, and material components, like carbon fiber and semi
automatic gearboxes, allow it. Unlike in 67!

--

Gerry Aitken

...and a friend shall lose a friend's hammer -- Book of Cyril, chapter
6, verse 16

Some Call Me Ti

simultaneous throttle and brake

by Some Call Me Ti » Tue, 02 Sep 2003 07:42:33


> >It was my impression that this technique had been in use by lots of
> >drivers for years.

As far as I know Rubens and David are the only current F1 drivers who still
right foot brake. Most drivers cut their teeth in karting where you have to
left foot brake anyway so this is not a problem for them. And of course all
current "quick" rally drivers left foot brake.

One of the most noticeable things in the F1 Racing article was how smooth
the brake and accelerator graphs of Michael were compared to Rubens.

Some Call Me Tim


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