Message-ID: <36AF62D4.64447ABF@comcen.com.au>
Date: Thu, 28 Jan 1999 06:02:44 +1100
From: Byron Forbes <hosh@comcen.com.au>
Organization: HOSHUMUNGUS ENTERPRIZES
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Subject: Re: Fast laps in GPL
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All this is becoming totally futile IMO. The biggest discrepancy between your lap
times and the fast guys would be most profound under braking and turn in. And trying to
compare relative speeds between replays would be laughable at these points since sppeds
are changing so rapidly. I really don't know what any of you are trying to get at! The
easy part is turning thru and driving out - something just about anyone can do. The
interesting part is always the braking and turn in at any corner on any track. Which in
turn leads to how good the mid corner is. So, you see, the braking and turn in is at least
2/3 of the corner.

  Question - how low a brake bias can you live with? Or how late a braking point.

Matthias Flatt wrote:
> 
> On 27 Jan 1999 00:18:54 GMT, casper@koivu.hut.fi (Casper Gripenberg)
> wrote:
> 
> >>Let's compare two drivers accelerating out of a 100mph curve on a long
> >>straight, topping out at 200mph, but the slower guy is on the gas 50
> >>meters later.
> >>If both are accelerating the same way (the two acceleration curves are
> >>50 meters apart, no wheelspin, same car and setup) the difference is
> >>that the slow guy is cruising the first 50 meters at the beginning at
> >>100mph (1.125sec), while the fast pilot is speeding 'his' 50 meters at
> >>200mph at the end of the straight. The difference is only 0.56 seconds
> >>which is IMHO not much compared to the 50 meters (or more than 10
> >>lenghts of a car, or 1.125sec) which the slow driver hesitates before
> >>he dares to move his right foot.
> 
> >This is where you're probably mistaken. The two 'accelerating curves'
> >won't stay 50m apart through the acceleration.
> I meant the beginning of the acceleration. What distances the cars
> have during the acceleration time/distance does not matter.
> 
> > The distance will
> >grow with time. This comes from the fact that the guy starting
> >to accelerate earlier has a higher speed at any point and time
> >on the straight where he's accelerating than the guy starting
> >50m later. So at the end of the straight your 50m will
> >have grown to, say 70m or a 100m.
> Well, 100m is a good guess, but you forget that in this example, the
> cars were not 50m apart at the beginning, but side by side. The
> overall gain of early acceleration is, as I figured out, 50m.
> 
> As you did not understand my example the way I intended, I'll explain
> it again: Let's say a single driver travels at 100mph, then
> accelerates somehow within a mile to 200 mph, then continues at 200
> mph. What I compared was the time consumed for 50m@100mph + 1 mile and
> 1 mile + 50m@200mph, so same distance overall, but around 0.5 sec
> difference in the time needed.
> With that example, the 1.1sec or 50m acceleration delay at 100mph of
> the slower driver/driving leeds to only 0.5 sec or 50m disadvantage
> compared to the fast driver/driving.
> 
> BTW: I think the effect of seeing a growing/shrinking distance to the
> car ahead is called "rubber band effect", because the time gap between
> two cars stays roughly the same, but speeds and thus distances vary.
> 
> --
>    _____
>  /_______\              .\\ a t t h e a d
> I  XT /~~~~
> I  500\_____       1977' Yamaha XT.Rex 500 Enduro
>  \____/\__I_I      http://matthead.home.pages.de/

-- 
 Byron Forbes
 Captain of Team Lightning Bolt

 http://members.tripod.com/~HOSHUMUNGUS


    and

 http://www.frontiernet.net/~godsoe/bolt/home.htm
