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Insane speed in german cars... [Maxima] (+ tire slip and stuff)
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Rest assured that ALL parts of the tire are rotating at the same AVERAGE =
rpm during cruise, accelleration, or braking. Otherwise, as you said, =
the tire would quickly come apart, since the tire does not possess the =
characteristic of infinite stretch.
Larry
----- Original Message -----=20
From: Allyn=20
To: Robert Piwonka ; scirocco-l@scirocco.org ; Jason=20
Sent: Wednesday, November 06, 2002 8:55 PM
Subject: Re: Insane speed in german cars... [Maxima] (+ tire slip and =
stuff)
> i.e the slowdown when the tire first contacts the
> road is cancelled 100% by the speedup when the tread separates from =
the
> pavement?
>
> Follow me?
>
yes, this does happen (or else the tire would tear into 2 pieces), =
though the
'damage' is already done. the only part that matters as far as pushing =
the car
is the contact patch area. since the slow-down occurs there, this =
ultimately
results in the rim rotation speed going faster than normal for a =
respective road
speed.
if there was a way to apply an outside force to a rocco such that it =
was 'stuck'
at 100 mph, your speedo would show 100 mph while coasting, but would =
read
slightly higher than 100 at full throttle. likewise, it would read =
slightly
lower than 100 while braking (assuming you dont lock the wheels).
another important thing to realize is that tires do this laterally as =
well
(turning). instead of just slip, its called 'slip angle'. when you try =
to turn,
your tires are pointed at a sharper angle than the front end of the =
car is
actually going. as tread blocks come in contact with and grip the =
road, they
begin taking some of the sideways load, causing the sidewall to shift =
over in
that section. this sidewall shift gets worse until the tread section =
reaches the
rear part of the contact patch. it then rolls away from the road, lets =
go, and
the tread section then returns to its normal place.
you might think you could turn the hardest with no slip angle at all, =
but most
tires generate the greatest lateral grip while slipping at a 5-10 =
degree angle.
i'll bring my bosch handbook back from work tomorrow and try to scan =
some of the
tire charts. they show it pretty well.
Al
_______________________________________________
Scirocco-l mailing list
Scirocco-l@scirocco.org
http://neubayern.net/mailman/listinfo/scirocco-l
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<DIV><FONT face=3DArial size=3D2>Rest assured that ALL parts of the tire =
are=20
rotating at the same AVERAGE rpm during cruise, accelleration, or=20
braking. Otherwise, as you said, the tire would quickly come =
apart,=20
since the tire does not possess the characteristic of infinite=20
stretch.</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A href=3D"mailto:amalventano@sc.rr.com"; =
title=3Damalventano@sc.rr.com>Allyn</A>=20
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
href=3D"mailto:tpiwonka@ttacs.ttu.edu"; =
title=3Dtpiwonka@ttacs.ttu.edu>Robert=20
Piwonka</A> ; <A href=3D"mailto:scirocco-l@scirocco.org"=20
title=3Dscirocco-l@scirocco.org>scirocco-l@scirocco.org</A> ; <A=20
href=3D"mailto:jason@scirocco.org"; =
title=3Djason@scirocco.org>Jason</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, November 06, =
2002 8:55=20
PM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Insane speed in =
german=20
cars... [Maxima] (+ tire slip and stuff)</DIV>
<DIV><BR></DIV>> i.e the slowdown when the tire first contacts =
the<BR>>=20
road is cancelled 100% by the speedup when the tread separates from=20
the<BR>> pavement?<BR>><BR>> Follow me?<BR>><BR><BR>yes, =
this does=20
happen (or else the tire would tear into 2 pieces), though =
the<BR>'damage' is=20
already done. the only part that matters as far as pushing the =
car<BR>is the=20
contact patch area. since the slow-down occurs there, this=20
ultimately<BR>results in the rim rotation speed going faster than =
normal for a=20
respective road<BR>speed.<BR><BR>if there was a way to apply an =
outside force=20
to a rocco such that it was 'stuck'<BR>at 100 mph, your speedo would =
show 100=20
mph while coasting, but would read<BR>slightly higher than 100 at full =
throttle. likewise, it would read slightly<BR>lower than 100 while =
braking=20
(assuming you dont lock the wheels).<BR><BR>another important thing to =
realize=20
is that tires do this laterally as well<BR>(turning). instead of just =
slip,=20
its called 'slip angle'. when you try to turn,<BR>your tires are =
pointed at a=20
sharper angle than the front end of the car is<BR>actually going. as =
tread=20
blocks come in contact with and grip the road, they<BR>begin taking =
some of=20
the sideways load, causing the sidewall to shift over in<BR>that =
section. this=20
sidewall shift gets worse until the tread section reaches the<BR>rear =
part of=20
the contact patch. it then rolls away from the road, lets go, =
and<BR>the tread=20
section then returns to its normal place.<BR><BR>you might think you =
could=20
turn the hardest with no slip angle at all, but most<BR>tires generate =
the=20
greatest lateral grip while slipping at a 5-10 degree =
angle.<BR><BR>i'll bring=20
my bosch handbook back from work tomorrow and try to scan some of =
the<BR>tire=20
charts. they show it pretty=20
=
well.<BR>Al<BR><BR><BR>_______________________________________________<BR=
>Scirocco-l=20
mailing list<BR><A=20
=
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR><A=
=20
=
href=3D"http://neubayern.net/mailman/listinfo/scirocco-l";>http://neubayer=
n.net/mailman/listinfo/scirocco-l</A><BR></BLOCKQUOTE></BODY></HTML>
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