Science > Physics > Heavy loaded autombobile rear vs. pulling trailer question.
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Science > Physics |
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"" |
| Date: |
18 Sep 2005 07:22:09 AM |
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Heavy loaded autombobile rear vs. pulling trailer question. |
An automobile that has 70% if its weight towards the rear (30:70) will
dangerously oversteer.
If a 30% rear loaded automobile (70:30) tows a trailer on which an
equal weight automobile is sitting, what effect is there on the
handling to the vehicle?
BoyntonStu
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| User: "CWatters" |
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| Title: Re: Heavy loaded autombobile rear vs. pulling trailer question. |
18 Sep 2005 08:52:27 AM |
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<stu@aaronj.com> wrote in message
news:1127046129.046984.251100@g49g2000cwa.googlegroups.com...
An automobile that has 70% if its weight towards the rear (30:70) will
dangerously oversteer.
If a 30% rear loaded automobile (70:30) tows a trailer on which an
equal weight automobile is sitting, what effect is there on the
handling to the vehicle?
Whatever - it will depends how the trailer is loaded.
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| User: "" |
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| Title: Re: Heavy loaded autombobile rear vs. pulling trailer question. |
18 Sep 2005 10:51:10 AM |
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Why is the trailer loading an issue?
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| User: "CWatters" |
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| Title: Re: Heavy loaded autombobile rear vs. pulling trailer question. |
18 Sep 2005 12:19:41 PM |
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<stu@aaronj.com> wrote in message
news:1127058670.834372.84340@g43g2000cwa.googlegroups.com...
Why is the trailer loading an issue?
In extreem... Try putting all the weight at the back of the trailer. That
will tend to lift up the hitch point reducing the load on the cars rear
wheels. Also when going round a corner the trailer will try and oversteer.
That will put a side load on the hitch that tries to make the car
understeer. The reverse is also true.
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| User: "Martin" |
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| Title: Re: Heavy loaded autombobile rear vs. pulling trailer question. |
18 Sep 2005 11:40:16 AM |
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wrote:
An automobile that has 70% if its weight towards the rear (30:70) will
dangerously oversteer.
I'm curious, my inclination would be that the car would understeer
spectacularly
If a 30% rear loaded automobile (70:30) tows a trailer on which an
equal weight automobile is sitting, what effect is there on the
handling to the vehicle?
BoyntonStu
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| User: "CWatters" |
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| Title: Re: Heavy loaded autombobile rear vs. pulling trailer question. |
18 Sep 2005 12:21:24 PM |
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"Martin" <usenet@etiqa.co.uk> wrote in message
news:432d9863$0$318$da0feed9@news.zen.co.uk...
stu@aaronj.com wrote:
An automobile that has 70% if its weight towards the rear (30:70) will
dangerously oversteer.
I'm curious, my inclination would be that the car would understeer
spectacularly
Nope. More sideways force on the back wheels makes the back wheels step out
more than the front.
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| User: "Martin" |
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| Title: Re: Heavy loaded autombobile rear vs. pulling trailer question. |
19 Sep 2005 05:35:06 AM |
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CWatters wrote:
"Martin" <usenet@etiqa.co.uk> wrote in message
news:432d9863$0$318$da0feed9@news.zen.co.uk...
stu@aaronj.com wrote:
An automobile that has 70% if its weight towards the rear (30:70) will
dangerously oversteer.
I'm curious, my inclination would be that the car would understeer
spectacularly
Nope. More sideways force on the back wheels makes the back wheels step out
more than the front.
mmm now you see, my inclination was that the additional downward force
on the rear would make them less likely to lose grip than a lightly
loaded wheel.
I was thinking (in a pondering sort of way) that if we were to take it
to the extreme and have (say) 99% of the load over the rear, and were
driving on a slippery surface, then come to turn there would not be any
load on the front to keep the front wheels on the road, so you would
have understeer. Then going back to your 70% rear loading (all other
things being equal) on a slippery road again I'd think the front wheels
would lose grip first.
What you seem to be saying is that if you increase the load on the rear,
then it makes the rear more likely to slip, which is counter-intuative,
especially as I'm a F1 fan.
Anyone else want to chip in?
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| User: "CWatters" |
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| Title: Re: Heavy loaded autombobile rear vs. pulling trailer question. |
19 Sep 2005 09:40:29 AM |
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"Martin" <usenet@etiqa.co.uk> wrote in message
news:432e944b$0$32733$da0feed9@news.zen.co.uk...
mmm now you see, my inclination was that the additional downward force
on the rear would make them less likely to lose grip than a lightly
loaded wheel.
Humm. I see your point.
I was thinking (in a pondering sort of way) that if we were to take it
to the extreme and have (say) 99% of the load over the rear, and were
driving on a slippery surface, then come to turn there would not be any
load on the front to keep the front wheels on the road, so you would
have understeer
or look at it this way... Assume 100% over the rear axle. In which case you
might as well remove the front wheels because they have _no_ grip. Why is
there any under/oversteer in this situation? The radial loads are exactly
over the rear axle.
Then going back to your 70% rear loading (all other
things being equal) on a slippery road again I'd think the front wheels
would lose grip first.
Humm I'm coming to the view that the loading of the car makes no
difference - unless there are some non-linear effects.
What you seem to be saying is that if you increase the load on the rear,
then it makes the rear more likely to slip, which is counter-intuative,
especially as I'm a F1 fan.
...but that's to stop wheel spin. Rally cars have 4WD and a more balanced
weight distribution.
The effect of the trailer is another matter.
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