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Re: accelerating while cornering

 To: triumphs@Autox.Team.Net Re: accelerating while cornering Cliff Hansen Wed, 25 Feb 1998 22:41:20 -0500
 ```Ah, seems to be the evening to spout off about anything but Triumphs. Maybe 'cause my *&!%! parts aren't here yet.... The simple answer is that accelerating while in a curve helps the car negotiate the curve by moving the car towards understeer (in a manner of speaking.) Braking while in a curve moves the car towards oversteer. So you should slow down before entering the curve, then accelerate through the curve (but not 'till the back wheels come loose :-) If you want the long answer keep reading. I've tried to interpret the math in useful terms. Please don't let the following paragraph stop you. Vector analysis of the motion of a particle along a curve results in the following expression for the acceleration vector A acting on the particle: A = (s' )T + (s^2 K) N, where s' is the rate of change in the speed of the particle T is the unit tangent vector s^2 is the square of the speed K is the curvature N is the unit normal vector These two vectors, (s')T and (s^2 K) N, add together to get the acceleration acting on the car. Assume for the sake of example that you're turning left, like at Indy (I can dream can't I). Since N always points towards the center of curvature, it points directly left over the driver's door. T always points straight ahead over the hood. If s' is positive (goosing the gas) then A points toward where you want to be (ahead and to the left.) When s' is negative (braking), A points behind and to the left, where you were, not where you want to go. A picture in this case would be worth most of the preceding 457 words. See, 15 years of math and a PhD is useful for something besides adding up the cost of all those parts. At 10:49 AM 02/26/98 +1100, you wrote: > >Rich, > >At 11:53 25/02/98 +0000, you wrote: >>I always understood it that it was best to keep your boot down when going round >>a corner so that you got the negative camber of the rear wheels, this will give >>you better grip, because as the body rolls, the outside wheel will become more >>upright, if you think about it, if the wheels are upright to start with, then >>they tilt over a bit, then you are getting similiarites to positive camber. > >The centripetal force (between the road and the tire) is responsible for the >camber change. One reason for accelerating is that doing so transfers weight >from the front to the rear wheels, improving their grip. There may also be >2nd-order effects I haven't read about. Someday I'll have to get out my >Classical Mechanics textbooks and suspension books, install Mathematica on >my PC, and produce the definitive treatise. > >Allen Nugent >Graduate School of Biomedical Engineering >University of New South Wales >Sydney 2052 Australia > > Cliff Hansen chansen@exis.net 1966 TR-4A CTC 64615L (Hibernating for front end work) ```
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