"Ron Calls on his years of experience....and freezes at the controls" (internerdstuff)
04/15/2014 at 20:37 • Filed to: None
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"Ron Calls on his years of experience....and freezes at the controls" (internerdstuff)
04/15/2014 at 20:37 • Filed to: None | 1
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Can anyone explain in a simple way the technicals of why rally cars corner the way they do? You know -the way they throw it sideways before the corner and use the back wheels to help change direction.
My best guess is that it has a lot to do with the difference between static and kinetic friction. i.e. - spinning wheels give better traction.Obviously dirt track speedway styles -both car and bike- are done for similar reasons.
AthomSfere
> Ron Calls on his years of experience....and freezes at the controls
04/15/2014 at 20:44 |
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Momentum... Why scrub speed if you don't have to?
Justin is driven
> Ron Calls on his years of experience....and freezes at the controls
04/15/2014 at 20:46 |
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I think a crude way to think about it is that slowing a car enough to grip on a loose surface would be way too slow, so the objective stops being "use all the grip available, but no more" and becomes "use any means necessary to get the car turned and accelerating in the right direction".
This means throwing the car sideways to aid in braking, and to utilize momentum to turn the car rather than friction from the front tires. Once the car is pointed in the right direction, It becomes about putting power down - which is why lurid powerslides are less common in top level rally these days than they used to be. the guys who are going sideways are doing so in the turn, not out of it, unless it's to set the car up for the next turn.
Vince-The Roadside Mechanic
> Justin is driven
04/15/2014 at 20:49 |
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good commenting from the new guy you will fit in no problem
tromoly
> Ron Calls on his years of experience....and freezes at the controls
04/15/2014 at 21:03 |
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Actually, your friction examples are backwards. The static friction coefficient is always higher than the kinetic friction coefficient, hence why in a drag race when the tires start spinning the car's acceleration slows down. So on a perfect surface, zero tire slip gives better traction.
From my limited rally set-up understanding, the tires won't really have traction to turn asphalt-style without slowing down tremendously, so there will always be some sliding. By pivoting the entire car, they can use drive from the tires to direct the car out of slides, i.e. pivot the car to point where they want to go, then use power to pull the car in that direction.
Icemanmaybeirunoutofthetalents
> Ron Calls on his years of experience....and freezes at the controls
04/15/2014 at 21:42 |
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Higher cornering speed = better. So rather than brake, slow down and struggle to get poewr down on a loose surface, better to slide around and maintain a higher speed through the corner. I think.
Where's Dusty when you need a rally man.