rec.autos.simulators

fuzzy logic why GPL cars slide

Alex Kihuran

fuzzy logic why GPL cars slide

by Alex Kihuran » Wed, 24 May 2000 04:00:00

Yep, I saw a Legends Of Motorsport from the 68 race at Rouen. The cars slid
at that corner before the finish a lot. They didn't slide as much as me in
GPL, but you also have to notice these are some of the best drivers EVER and
I think they could control a car better than some guys on the internet with
a steering wheel on their desk :)

Thanks,
Alex


> The biggest and really only reason why I didn't stay with GPL longer is
> because when I watched video of the real '67 F1 cars (and even older
cars),
> they didn't slide like they do in GPL. Even in the rain, the drivers
seemed
> to be able to hold the drive line. The AI cars in GPL resemble what I've
> seen on TV.

> David G Fisher



> >   This is a bit of a stretch...but....

> >   I watched the Speedvision special called "Victory by Design" which is
> > essentially a fluff piece by Alan DeCadney about all the various Porche
> > racing cars. (he also did one on Ferrari...lucky sot...gets to drive
> > dozens of Prancing Ponies and Stuttgarde vondercars)
> >   Anyhow, the show got to the part about the 917's, those glorious
> > Le Mans type racers of the eary 70's.  Now I'm pretty sure they didn't
> > have ground effects yet...and one of it's drivers(Brian Redman) was
> > quoted in a magazine saying the 917 was a HUGELY unstable racer...fast
> > but twitchy...hmmm where was I?   OH yes...917's and why GPL cars did
> > indeed slide.
> >   They showed some footage of the 917 going up through Eau Rouge at Spa.
> > on one paticular lap the driver had the car sliding all the way up the
> > hill, he only caught it just before the track turned back to the left at
> > the top.  Now this 917 had an aerodynamic nose which had to produce SOME
> > sort of downforce and a couple of horizontal tail fins on the rear.
> > These too must have contributed to the downforce effect.  Yet the car
> > was sliding all the way up the hill.
> >   Now if a 917 with at least some semblance of an aero package can
> > slip and slide around corners, why is it hard for some of us to beleive
> > the non-winged, non-aero'd, non-groundeffects cars of 1967 slipped all
> > over too?
> > dave henrie

Alex Kihuran

fuzzy logic why GPL cars slide

by Alex Kihuran » Wed, 24 May 2000 04:00:00

In 1967 they didn't even have seatbelts! I know how much a seatbelt helps in
a go-karting accident for god sake! Imagine a collision at 100mph with
nothing holding you in!

Thanks,
Alex



> % The biggest and really only reason why I didn't stay with GPL longer is
> % because when I watched video of the real '67 F1 cars (and even older
cars),
> % they didn't slide like they do in GPL. Even in the rain, the drivers
seemed
> % to be able to hold the drive line. The AI cars in GPL resemble what I've
> % seen on TV.

> My GPL car doesn't 'slide' around like alot of others.  It is because I
> drive differently.  I also agree that GPL is not 1000% accurate in its
> physics.  Compromises were made so we could run GPL on PC's and not
> super-computers.  However, if one opts to drive (and setup) the GPL cars
> in a realistic manner, there is no need to let it all hang-out.  That is
> unless you want to achieve lap times that are under real-life times of
> the era.  Without the fear of serious injury or death (or losing one's
> job as a F1 pilot), many GPL drivers overdrive their cars.  Some have
> learned to master it to their advantage.  Then there is the other school
> of driving where one hangs it all out because they haven't learned to
> handle the car yet.  I bet if one wanted to they could drive the real
> '67 cars like they do in GPL, but then they wouldn't have a car after
> too many laps. ;-)  I am most certainly not the fastest GPL pilot out
> there (by a long shot), but I am not dead slow and am more consistent
> than most.  I don't win very many races, but I can manage to finish in
> the points and even a rare podium finish as well.  I think you are
> confusing the car vs. the driver in your evaluation of GPL.

> BTW:  GP2 didn't allow one to over-drive the car.  For example the
> Parabolica....  you could easily push the car through this turn and
> never really lose it (you may have missed the turn, but it would stick
> like it was on rails if you nailed the turn in).  GPL models its physics
> beyond the envelope as well as within it.

> Oh and one more thing, I thought you gave up on GPL because it sucked
> online. ;-)

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

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

Pat Dotso

fuzzy logic why GPL cars slide

by Pat Dotso » Wed, 24 May 2000 04:00:00

Hope you don't mind.  I emailed my Kyalami hotlap to
you - it's only 180K.  It's only 26th fastest in the
World, but it's the fastest lap submitted by an
American.

BTW, I assume that by "sliding", you mean***
the rear of the car out, using opposite lock to
control it.  GPL hotlap drivers do slide, but it's
a four wheel drift.  On my lap, I don't use opposite
lock anywhere on the track.  In fact, I tend to use
excessive positive lock.  ANYTIME I have to use
opposite lock to catch a slide in GPL, my lap time
is lower.

--
Pat Dotson


> I should of said that they didn't slide like they do in GPL while running
> the same lap times.

> Where are these replays?

http://www.racesimcentral.net/
Chris Bloo

fuzzy logic why GPL cars slide

by Chris Bloo » Wed, 24 May 2000 04:00:00

I have found that excessive sliding isn't the fastest way around
the tracks in GPL.  The point where the tyres are just losing
grip but you are not actually getting the tail out seems to be
the fastest way to go.

I must admit I am no where near the fastest GPL driver, I'm
probarbly in 40,001 position;)  I have been practicing
Silverstone alot recently and my best lap (for pole position)
showed in a replay no smoke coming from my tyres, I managed to
keep the car straight the whole way round the lap.  It actually
didn't seem like a fast lap.

Chris

In article <E2oW4.206240


>The biggest and really only reason why I didn't stay with GPL
longer is
>because when I watched video of the real '67 F1 cars (and even
older cars),
>they didn't slide like they do in GPL. Even in the rain, the
drivers seemed
>to be able to hold the drive line. The AI cars in GPL resemble
what I've
>seen on TV.

>David G Fisher

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No

fuzzy logic why GPL cars slide

by No » Thu, 25 May 2000 04:00:00

On Tue, 23 May 2000 18:42:15 -0400, "Alex Kihurani"

And there's the rub. It's harder to control a race car on a monitor
with a wheel on the desk because it gives no situational awareness or
gforce feedback. That's why a sim should be completely configurable so
that those of us who realize that can make changes to cut us a bit of
slack to overcome this problem.

--
Nos

David G Fishe

fuzzy logic why GPL cars slide

by David G Fishe » Thu, 25 May 2000 04:00:00




> % The biggest and really only reason why I didn't stay with GPL longer is
> % because when I watched video of the real '67 F1 cars (and even older
cars),
> % they didn't slide like they do in GPL. Even in the rain, the drivers
seemed
> % to be able to hold the drive line. The AI cars in GPL resemble what I've
> % seen on TV.

> My GPL car doesn't 'slide' around like alot of others.  It is because I
> drive differently.  I also agree that GPL is not 1000% accurate in its
> physics.  Compromises were made so we could run GPL on PC's and not
> super-computers.  However, if one opts to drive (and setup) the GPL cars
> in a realistic manner, there is no need to let it all hang-out.  That is
> unless you want to achieve lap times that are under real-life times of
> the era.

I forget where I saw it recently, but someone has a GPL web site with the
real life record times for each track in '67. For example, the record at WG
was 1:05 (almost positive). I've yet to see a replay where someone was able
to do a 1:05 in GPL and hold onto the drive line as the AI do. Nice and
smooth like the AI and real life video I've seen on television. Monza?
Mosport?

After two years, there should be plenty of replays available which show
this. I'm not trying to start up a "typical" GPL debate either. You'll just
have to trust me.  :-o

Maybe it's just a pet peeve of mine that I need to get over, but I always
try to be as smooth as possible with my sim driving, yet still fast. If it's
necessary to use a "hotlap" style to be fast, then IMO, something is wrong
with the sim. That doesn't mean I think GPL isn't an excellent sim, just not
good enough to crown it king over all others, and to insult and ignore the
rest.

That too. :-P

David G Fisher

********************* Michael E. Carver *************************

- Show quoted text -

>      Upside out, or inside down...False alarm the only game in town.

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

David G Fishe

fuzzy logic why GPL cars slide

by David G Fishe » Thu, 25 May 2000 04:00:00

Speedvision is one constant source. During F1 races on both Fox and
Speedvision.

Even the cars of the 50's and 40's seemed to be able to stay neutral. Then
there's video of all of these cars in the rain, still more smooth and in
control than the GPL cars.

David G Fisher



> > The biggest and really only reason why I didn't stay with GPL longer is
> > because when I watched video of the real '67 F1 cars

> What video?  Please name them David.

> Be sure that in the videos I have of 1967 they get into major powerslides
> and do indeed race like the AI, which is a balance between neutral feeling
> and sliding.  Much more than in modern racing of course.  Still, sliding
is
> not the fastest way to be constantly fast in GPL, and it's proven when you
> check out online drivers compared to hotlappers.  But we all know that you
> have a misledding experience of GPL multiplayer racing David.  Of course
> hotlapping techniques couldn't be achieved by real-life drivers for
obvious
> reasons and that is why you are misled into thinking that the cars in GPL
> slide too much.  It's just that no human beeing would have the balls to do
> that.  The numbers of times that any of us got killed in GPL is enormous.

> Those F1 drivers were the best and could achieve incredibly fast laptimes
> and at the same time keep those over-powered cars the most neutral
possible.

> -- How hard is it to understand? And if you don't like the sliding effect,
> friggin tweak the car!
> -- Fran?ois Mnard <ymenard>
> -- May the Downforce be with you...
> -- http://www.WeRace.net
> -- People think it must be fun to be a super genius, but they don't
realise
> how hard it is to put up with all the idiots in the world.

David G Fishe

fuzzy logic why GPL cars slide

by David G Fishe » Thu, 25 May 2000 04:00:00

I should of said that they didn't slide like they do in GPL while running
the same lap times.

Where are these replays?

David G Fisher



> > The biggest and really only reason why I didn't stay with GPL longer is
> > because when I watched video of the real '67 F1 cars (and even older
cars),
> > they didn't slide like they do in GPL.

> But they _could_ slide like that, if they wanted to.  But
> sliding like that is not the fast way around the track in
> real life, or in GPL.  Ignore the replays shipped with GPL,
> and look at some of the record hot laps available on the
> web.  Those guys slide very little.

> Again, '67 F1 cars can and did slide, just like they can
> and do in GPL.  A good and fast driver, though, won't
> usually slide like that, either in GPL or in real life.

> --
> PD

ymenar

fuzzy logic why GPL cars slide

by ymenar » Thu, 25 May 2000 04:00:00


Exactly, but you are replying to David, who simply can't figure out that GPL
is the most realistic racing simulation ever and correctly models how 1967
Formula 1 handled.

Also, remember that in 68 they had wings, thus downforce so the sliding was
slighty reduced from what you had in 67!

--
-- Fran?ois Mnard <ymenard>
-- May the Downforce be with you...
-- http://www.WeRace.net
-- People think it must be fun to be a super genius, but they don't realise
how hard it is to put up with all the idiots in the world.

ymenar

fuzzy logic why GPL cars slide

by ymenar » Thu, 25 May 2000 04:00:00


Dammit David how many times do we have to tell you?  Hotlapping is NOT the
way to be consistantly fast in GPL!  Just ask those hotlappers how many
times they virtually died while hotlapping.  They are ALL dead a couple of
days after doing hotlappings maximum, with a good portion who have virtually
died a couple of hours or minutes after trying to hotlap.  Yet they Shift-R
and continue to do those crazy laptimes.  That's what virtual reality is for
David! You can do the same in any kind of racing simulation!

If you want to be consistantly fast like the real-life F1 drivers were, then
DO IT, but don't expect the hotlappers with an infinite ammount of life to
have the same handling than real F1 drivers back in the days, or in any kind
of racing

Why is it so hard to understand David?

--
-- Fran?ois Mnard <ymenard>
-- May the Downforce be with you...
-- http://www.WeRace.net
-- People think it must be fun to be a super genius, but they don't realise
how hard it is to put up with all the idiots in the world.

ymenar

fuzzy logic why GPL cars slide

by ymenar » Thu, 25 May 2000 04:00:00


Mmmm Speedvision.

Of course we are talking about Front-engine cars now David.  Please stop
your anti-GPL crusade.  Everybody agrees against you here.  The GPL AI gives
us the correct handling of those cars and it's the FASTEST way I still say.
Do you still have GPL installed?  Come race online and see the fast guy
NEVER sliding into any corners.  They do push-oversteer exiting corners

--
-- Fran?ois Mnard <ymenard>
-- May the Downforce be with you...
-- http://www.WeRace.net
-- People think it must be fun to be a super genius, but they don't realise
how hard it is to put up with all the idiots in the world.

Richard G Cleg

fuzzy logic why GPL cars slide

by Richard G Cleg » Thu, 25 May 2000 04:00:00


:> Yep, I saw a Legends Of Motorsport from the 68 race at Rouen. The cars
: slid
:> at that corner before the finish a lot. They didn't slide as much as me in
:> GPL, but you also have to notice these are some of the best drivers EVER
: and
:> I think they could control a car better than some guys on the internet
: with
:> a steering wheel on their desk :)

: Exactly, but you are replying to David, who simply can't figure out that GPL
: is the most realistic racing simulation ever and correctly models how 1967
: Formula 1 handled.

  It _is_ the most realistic racing simulation ever.  It does _not_
correctly model how '67 F1 cars handle.  I'm convinced (and have been
for a while) that the GPL cars do handle with excessive back end out.
Sliding is perhaps too extreme a word but I've never seen a lap of GPL
by a human at any speed which actually looked like the real drivers
looked.  From the world record stuff (which I've studied to try to hone
my line and acceleration) to me trundling around fairly slowly,
GPL doesn't "look right" from an out of car view.  It's a very subtle
thing but the cars are far too "tail out".  I'm not talking about four
wheel drift or a rear end slide but just the fact that the cars seem
to naturally slot into handling comfortably with the tail***
out which the real ones did not.  When it comes to spinning or crashing,
we all know that the GPL model is fundamentally a bit***-eyed (unless
the '67 cars really did rocket to 1000 feet in the air while rotating
like a spin-dryer on steroids).  Lack of chassis give and other damping
forces mean that when a GPL car lets go and spins, it really does spin
and keep going more than the cars of that era really did.  ('67 cars
spun out fairly regularly - they didn't often do the 720 degree GPL
spins though).

  GPL is the best there is _at the moment_ and I really love racing it.
However, that doesn't mean that there isn't plenty of room for
improvement because to my mind the GPL model is far too "rigid" in what
it does.  In some ways it's a typical "physicist" model constructed
(and very well constructed) from idealised rigid bars connected with
springs on tracks which seem to have fairly uniform coefficients of
friction "by section" (if you see what I mean).

  Like GP2 before it, there isn't much that can be seriously compared
with GPL in terms of accuracy - but there will be (one day).

--
Richard G. Clegg       Only the mind is waving
    Networks and Non-Linear Dynamics Group
      Dept. of Mathematics, Uni. of York
     UPDATED WWW: http://www.racesimcentral.net/

Michael E. Carve

fuzzy logic why GPL cars slide

by Michael E. Carve » Thu, 25 May 2000 04:00:00


% Speedvision is one constant source. During F1 races on both Fox and
% Speedvision.

% Even the cars of the 50's and 40's seemed to be able to stay neutral. Then
% there's video of all of these cars in the rain, still more smooth and in
% control than the GPL cars.

Duh who would want (or even could) drive in the rain with the rear
drifting out?   Again, it's not the GPL cars, but the drivers that drive
them....

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

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

Michael E. Carve

fuzzy logic why GPL cars slide

by Michael E. Carve » Thu, 25 May 2000 04:00:00


% I forget where I saw it recently, but someone has a GPL web site with the
% real life record times for each track in '67. For example, the record at WG
% was 1:05 (almost positive). I've yet to see a replay where someone was able
% to do a 1:05 in GPL and hold onto the drive line as the AI do. Nice and
% smooth like the AI and real life video I've seen on television. Monza?
% Mosport?

Pole for 1967 Glen by Hill (1:05.48) vs. Clark's 2nd spot (1:06.07).
3rd was Gurney 1:06.64).  The race fastest lap was by Hill on lap 81.
You can bet that they were pushing the car out to the edge during
qualifying, but kept them more in control during the race.  Have you
seen footage of the qualifying runs for 1967?

Monza's pole by Clark 1:28.5, 2nd Brabham 1:28.8, 3rd McLaren 1:29.31.
Race fastest lap Clark lap 26 at 1:28.5.  From Motor Sport magazine's
covrage of practice, "...Clark was preparing to try some Goodyear tyres,
as he did not like the way the Firestone tyres seemed reluctant to
slide..."  Regarding some of the fast lap times, "...Brabham and McLaren
were on the front row with lap times they could not repeat without a
slip-streaming "tow" from a faster car."  From the race report,
"Stewart lost a whole lap at the pits, having stopped to see if he had
damaged his left rear Goodyear after sliding the tail too far at Lesmo
and hitting the guard-rail."

Mosport's pole by 1:22.4, 2nd Hill 1:22.7, 3rd Hulme 1:23.2.
Race fastest lap by Clark 1:23.1 lap 54.  From the race report in Motor
Sport magazine, "As he [Clark during practice] went into the first
corner past the pits, the tail swung wide and he spun in the middle of
the road at about 120 m.p.h."  The race started with a wet track, again
from Motor Sport: "Clark was still leading but using an awful lot of
road..."  As the rain stopped and the track dried, "Irwin spun on lap
18... Pease spun off... He [Hulme] passed Gurney and then, with the
tail*** well out..."

% After two years, there should be plenty of replays available which show
% this. I'm not trying to start up a "typical" GPL debate either. You'll just
% have to trust me.  :-o

% Maybe it's just a pet peeve of mine that I need to get over, but I always
% try to be as smooth as possible with my sim driving, yet still fast. If it's
% necessary to use a "hotlap" style to be fast, then IMO, something is wrong
% with the sim. That doesn't mean I think GPL isn't an excellent sim, just not
% good enough to crown it king over all others, and to insult and ignore the
% rest.

Ask anyone who has raced with me online and they will tell you I am
smooth (to a fault).  During the last GPLWS (Grand Prix Legends World
Series) I placed 4th on the grid at Monza with a 1:28.5 with my race
fastest lap being 1m28.776s.  Of course this is a division where we
don't allow the "hot shoes" to race <G>.  At Mosport I placed 5th on the
grid with a 1:23.22 and Alison Hine (a very smooth driver) had the pole
with a Brabham at 1m22.654s.  At the Glen I placed 3rd on the grid with
a 1m05.562s and had a race fast lap of 1m05.899s.

If you are interested, replays of these races (as well as the Elite
division which is composed of hot-shoes -- i.e., Greger Huttu) are still
available.  I think you would be pleasently surprised to watch Greger in
"race" mode.  He's fast and smooth.  I can provide you with the ftp site
information if you wish (just e-mail me).

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

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

Michael E. Carve

fuzzy logic why GPL cars slide

by Michael E. Carve » Thu, 25 May 2000 04:00:00


% BTW, I assume that by "sliding", you mean***
% the rear of the car out, using opposite lock to
% control it.  GPL hotlap drivers do slide, but it's
% a four wheel drift.  On my lap, I don't use opposite
% lock anywhere on the track.  In fact, I tend to use
% excessive positive lock.  ANYTIME I have to use
% opposite lock to catch a slide in GPL, my lap time
% is lower.

And damn it Pat, you are fast and smooth.... I think only once in our
races did I ever get by you because of a mistake you made... only to get
quickly passed a few laps later <G>

BTW:  For the record Pat isn't a GPL-god all other sims-evil person.  As
a matter of fact he is a staunch defender of f12k.  So put that in your
pipe and smoke it Dave.... it might produce a better effect than what
you are smoking now. ;-)

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

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


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