rec.autos.simulators

GPL physics question.

Andreas Nystro

GPL physics question.

by Andreas Nystro » Thu, 28 Mar 2002 21:10:26

Ok, I've read that Formula 1 1967 had tires that lasted 2-3 races, so I
guess this mean
they should have been really really hard (thats a lot of laps in 3races +
practice)

Then i do some laps and save the replay and load it into GPL
replay-analyzer, and take
a look at the traction-circle, and tell it to show 1.0 1.5 2.0g circles, and
what do you see?
Well, the car pulls around 1.8g in some corners, and 1.5-2g in braking, and
only about 0.5g
in acceleration.

If this GPL Replay-analyzer is accurate in traction, then there is something
wrong in the physics.
Tires that last for 3races shouldnt be able to get a car pulling 1.8g's.
Its a shame that GPL was probably rushed since it should have had tire-wear
and then we shouldnt
probably see these crazy figures?

But my biggest guess is that i read something wrong? :D anyone else noticed
this?

Dan Belch

GPL physics question.

by Dan Belch » Fri, 29 Mar 2002 08:39:35

The tires were NOT that hard; that's a common misconception.

-----------------------------------------
Dan Belcher
Webmaster,
http://www.gplworld.racesim.net/simcrash

Leo Landma

GPL physics question.

by Leo Landma » Fri, 29 Mar 2002 08:40:08



AFAIK the '67 tyres lasted one race, in the early sixties (1.5 l formula)
they lasted several weekends.

Bye,
Leo

Haqsa

GPL physics question.

by Haqsa » Fri, 29 Mar 2002 09:21:47

Not necessarily unreasonable.  First I don't think any of the cars can
pull more than 1.5G on flat ground, higher numbers come from taking
advantage of the crowned surface at many of the tracks.  Secondly, the
tires are very lightly loaded for their size, due to the light weight of
the GP cars, so they will be operating at near their maximum possible
friction coefficient.  And thirdly with such low centers of gravity
there is not as much loss of friction coefficient due to lateral weight
transfer, so again you are using the tire much more efficiently than a
larger car would.  While I admit I have some issues with GPL physics
myself, the bottom line is that people are getting fairly realistic lap
times, and that would not be possible if the tire traction was way off.


T.Galvi

GPL physics question.

by T.Galvi » Fri, 29 Mar 2002 16:09:10


snip
tire-wear

Heheheheh complaining about a four year old game being rushed.  The fact
that we are still playing it surely suggests that it was not rushed.
By now it really doesnt matter how close to a racing car simulation it is.
GPL has become a sport in its own right.

Todd.

Andreas Nystro

GPL physics question.

by Andreas Nystro » Fri, 29 Mar 2002 18:22:08

Well, first of all, thanks for the answers.
I saw some footage from Monza 1962 and those tires looked terrible after the
race, so i think we can say that the "lasted for 3 races" rumour isnt true
at all.

Second, about it being rushed, well i thought so, since the commercial about
GPL said it would include tirewear, and wheater, but the final product
didnt.

Like F1 2001 was rushed, no "marshalls" until the 2nd patch, or FF.

/ Andreas - waiting for LeMans legends 1967 ;)




> snip
> > Its a shame that GPL was probably rushed since it should have had
> tire-wear

> Heheheheh complaining about a four year old game being rushed.  The fact
> that we are still playing it surely suggests that it was not rushed.
> By now it really doesnt matter how close to a racing car simulation it is.
> GPL has become a sport in its own right.

> Todd.

Andre Warrin

GPL physics question.

by Andre Warrin » Fri, 29 Mar 2002 19:21:52



They worked for what, three years on GPL? Not everything they planned
to include made it into GPL, but don't ya dare compare GPL to the
state in which F1 2001 was delivered..

Andre

Stephen F

GPL physics question.

by Stephen F » Fri, 29 Mar 2002 19:25:09


I've read interviews with Lotus employees which also contradicted this old
gem.  They lasted the whole race, maybe even the whole weekend, but not
several races.

J Sakari Salone

GPL physics question.

by J Sakari Salone » Fri, 29 Mar 2002 19:33:49




>> Well, first of all, thanks for the answers.
>> I saw some footage from Monza 1962 and those tires looked terrible after
> the
>> race, so i think we can say that the "lasted for 3 races" rumour isnt true
>> at all.
> I've read interviews with Lotus employees which also contradicted this old
> gem.  They lasted the whole race, maybe even the whole weekend, but not
> several races.

This is also more or less what the late John Cooper said in that interview on
one of the GPL websites.

--

Mats Lofkvis

GPL physics question.

by Mats Lofkvis » Fri, 29 Mar 2002 19:48:37

[snip]

Imho, GPL would never had become a sport in its own right if not for
the fact that it is reasonably close to a racing car simulation :-)

I probably would drop GPL really fast if something clearly better
showed up. But I like the old style open wheels racing (partly
becuase the fact that everything happens slower compared to e.g.
modern f1 which makes it much more suitable for a pc simulation),
so I'm quite sure f1-2007 however good it is still won't replace
GPL for me.

      _
Mats Lofkvist

Jim Seamu

GPL physics question.

by Jim Seamu » Sat, 30 Mar 2002 02:42:28


But I like the old style open wheels racing (partly

Totally agree with this - I think the (relatively) low power and lack of
downforce make for much better pc racing. IMO a Barber Dodge / Formula Ford
sim would be the ideal online race category.

Dave Henri

GPL physics question.

by Dave Henri » Sat, 30 Mar 2002 02:55:15


   There is a F1 2000 mod in the works for Nascar Heat.  That would pretty
much meet the low power high grip formula.
dave henrie

Rowdy *Rodney* Pipe

GPL physics question.

by Rowdy *Rodney* Pipe » Sat, 30 Mar 2002 05:25:27


The truth of the matter is that GPL is prbably one of the most flawed and
unrealistic physics model of an actual car you can get without going the
"Johnny Herbert GP" route.
Its an impression of what a car with lots of power and little grip could be
like.
The physics model reality in that it *could* model the physics of a 1967 GP
car fairly accuratly using the same engine but it doesn't.
The cars are total fantasy.

The only reason people feel it to be realistic is because it is hard as
opposed to arcades which are easy. This is one thing I've alays wondered
about GPL.
It models the movement of a high-ish power, low grip car well but it doesn't
model a 1967 F1 car, not by a long shot.

Rowdy *Rodney* Pipe

GPL physics question.

by Rowdy *Rodney* Pipe » Sat, 30 Mar 2002 05:28:04




> snip
> > Its a shame that GPL was probably rushed since it should have had
> tire-wear

> Heheheheh complaining about a four year old game being rushed.  The fact
> that we are still playing it surely suggests that it was not rushed.
> By now it really doesnt matter how close to a racing car simulation it is.
> GPL has become a sport in its own right.

> Todd.

Er, I think you will find the final product was very rushed and left out
many vital features which it was supposed to have.

It basically matches most peoles impressions of what it must feel like to
drvie one of these caers but it' not based on any data or anything at all.

John Pancoas

GPL physics question.

by John Pancoas » Sat, 30 Mar 2002 05:34:31

  While maybe not from the same approach as you, I agree.  Like N4, I've
always thought the grip, etc. of the stock F1 physics in GPL was a bit over
the top.

  Whether they were pros, and were not, pc limitations aside, etc. I have a
very hard time believing the actual cars were that hard to drive.  Yes, I'm
aware of the deaths, etc. that occured, but it seems most of those were
caused by mechanical problems that led to a wreck.

  All IMO of course, so save the flames everyone........I'm not preaching
heresy, just an opinion<G>

-John





> > Ok, I've read that Formula 1 1967 had tires that lasted 2-3 races, so I
> > guess this mean
> > they should have been really really hard (thats a lot of laps in 3races
+
> > practice)

> > Then i do some laps and save the replay and load it into GPL
> > replay-analyzer, and take
> > a look at the traction-circle, and tell it to show 1.0 1.5 2.0g circles,
> and
> > what do you see?
> > Well, the car pulls around 1.8g in some corners, and 1.5-2g in braking,
> and
> > only about 0.5g
> > in acceleration.

> > If this GPL Replay-analyzer is accurate in traction, then there is
> something
> > wrong in the physics.
> > Tires that last for 3races shouldnt be able to get a car pulling 1.8g's.
> > Its a shame that GPL was probably rushed since it should have had
> tire-wear
> > and then we shouldnt
> > probably see these crazy figures?

> > But my biggest guess is that i read something wrong? :D anyone else
> noticed
> > this?

> The truth of the matter is that GPL is prbably one of the most flawed and
> unrealistic physics model of an actual car you can get without going the
> "Johnny Herbert GP" route.
> Its an impression of what a car with lots of power and little grip could
be
> like.
> The physics model reality in that it *could* model the physics of a 1967
GP
> car fairly accuratly using the same engine but it doesn't.
> The cars are total fantasy.

> The only reason people feel it to be realistic is because it is hard as
> opposed to arcades which are easy. This is one thing I've alays wondered
> about GPL.
> It models the movement of a high-ish power, low grip car well but it
doesn't
> model a 1967 F1 car, not by a long shot.


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