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Re: Let's codify the discussion
Posted by 'davidmc' on 18 Aug 2010 @ 19:08


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davidmc
Joined: April 2003
Total Posts: 2
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The graphs it shows are not conjecture. The graphs are obtained through physical measurement. Pacejka is simply a way of putting all of that into a mathematical model where tyre suppliers can give the coefficients to vehicle designers if they so wished. The rest of the model goes on to alter the coefficients depending on things such as pressure, temperature etc.

"Secondly...... the deformation of the tyre wall is in REACTION and PROPORTION to the degree of retardation"

This isn't anything like a first order system. The deformation of the tyre (the whole tyre, not just the wall but the contact patch etc) has a direct affect on the level of retardation achieved.

" I am showing you that the retardation is NOT based SOLELY on the 100/20 basis as the O*N*L*Y part of the kart which is CAUSING the retardation is the CONTACT PATCH...... and it CAN NOT KNOW that the 20kph slip it's suffering is based on 100/20 or is based on 50/20! We have agreed that the contact patch CAN know it's suffering 20/20 but thatt's the ONLY one it CAN know about!"

Nonsense, the level of deformation at the contact patch is sufficient for the tyre to "know" it is at 10deg slip (for instance) and the same level of deformation is why the tyre can "know" it is at 20% of rolling speed (for instance). The principal is no different.

"Scandinavian flick SHOULD only be useful when you are suffering 'understeer' and need to overcome the initial turn in problems!"

The Scandanavian flick works because it allows the attitude of the kart to be altered before the kart arrives at the corner. You don't have to use up any of your space/time between corner entry and apex rotating the kart about its axis.

Message Thread:

itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 15:03)
Re: itpro and Liam's braking performance debate  by 'itpro'   (17 Aug 2010 @ 15:57)
Re: itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 16:43)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (17 Aug 2010 @ 17:00)
Re: itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 17:05)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (17 Aug 2010 @ 22:08)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (17 Aug 2010 @ 16:50)
Re: itpro and Liam's braking performance debate  by 'itpro'   (17 Aug 2010 @ 17:35)
Re: itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 18:17)
Re: itpro and Liam's braking performance debate  by 'itpro'   (17 Aug 2010 @ 18:47)
Re: itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 19:12)
Re: itpro and Liam's braking performance debate  by 'itpro'   (17 Aug 2010 @ 19:30)
Re: itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 20:41)
Re: itpro and Liam's braking performance debate  by 'Traxtar'   (17 Aug 2010 @ 19:23)
Re: itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 20:13)
Re: itpro and Liam's braking performance debate  by 'Traxtar'   (17 Aug 2010 @ 20:42)
Re: itpro and Liam's braking performance debate  by 'Liam'   (17 Aug 2010 @ 21:05)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (17 Aug 2010 @ 21:55)
Re: itpro and Liam's braking performance debate  by 'BanzaiBoy'   (17 Aug 2010 @ 22:06)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (17 Aug 2010 @ 22:23)
Re: itpro and Liam's braking performance debate  by 'Traxtar'   (17 Aug 2010 @ 23:17)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (17 Aug 2010 @ 23:33)
Re: itpro and Liam's braking performance debate  by 'Liam'   (18 Aug 2010 @ 0:11)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (18 Aug 2010 @ 0:26)
Re: itpro and Liam's braking performance debate  by 'Liam'   (18 Aug 2010 @ 0:30)
Re: itpro and Liam's braking performance debate  by 'Traxtar'   (18 Aug 2010 @ 0:30)
Re: itpro and Liam's braking performance debate  by 'Liam'   (18 Aug 2010 @ 9:09)
Re: itpro and Liam's braking performance debate  by 'RobF1'   (18 Aug 2010 @ 9:58)
Errrrrr...... Rob........  by 'itpro'   (18 Aug 2010 @ 11:45)
Re: Errrrrr...... Rob........  by 'Liam'   (18 Aug 2010 @ 16:30)
But........ David.....that's daft!  by 'itpro'   (18 Aug 2010 @ 11:30)
Re: itpro and Liam's braking performance debate  by 'RobWallace'   (18 Aug 2010 @ 13:44)
Re: itpro and Liam's braking performance debate  by 'itpro'   (18 Aug 2010 @ 14:41)
Re: itpro and Liam's braking performance debate  by 'RobWallace'   (18 Aug 2010 @ 17:21)
Re: itpro and Liam's braking performance debate  by 'RobWallace'   (18 Aug 2010 @ 17:25)
Re: itpro and Liam's braking performance debate  by 'Liam'   (18 Aug 2010 @ 19:47)
Re: itpro and Liam's braking performance debate  by 'RobWallace'   (18 Aug 2010 @ 20:35)
Re: itpro and Liam's braking performance debate  by 'davidmc'   (18 Aug 2010 @ 20:46)
Re: itpro and Liam's braking performance debate  by 'RobWallace'   (18 Aug 2010 @ 13:35)
Re: itpro and Liam's braking performance debate  by 'Liam'   (18 Aug 2010 @ 13:56)
Re: itpro and Liam's braking performance debate  by 'itpro'   (18 Aug 2010 @ 14:46)
Re: itpro and Liam's braking performance debate  by 'Liam'   (18 Aug 2010 @ 0:23)
Let's codify the discussion  by 'itpro'   (18 Aug 2010 @ 12:16)
Re: Let's codify the discussion  by 'davidmc'   (18 Aug 2010 @ 14:12)
Re: Let's codify the discussion  by 'itpro'   (18 Aug 2010 @ 14:32)
Re: Let's codify the discussion  by 'davidmc'  << You are here!
Re: Let's codify the discussion  by 'itpro'   (20 Aug 2010 @ 17:00)
Re: Let's codify the discussion  by 'davidmc'   (20 Aug 2010 @ 18:01)
Re: Let's codify the discussion  by 'itpro'   (20 Aug 2010 @ 18:15)
Re: Let's codify the discussion  by 'davidmc'   (20 Aug 2010 @ 19:42)
Re: Let's codify the discussion  by 'davidmc'   (20 Aug 2010 @ 19:50)
Re: Let's codify the discussion  by 'Liam'   (18 Aug 2010 @ 14:14)
Cheers Liam  by 'itpro'   (18 Aug 2010 @ 14:54)
A Video  by 'itpro'   (18 Aug 2010 @ 15:19)
Re: A Video...... oops  by 'itpro'   (18 Aug 2010 @ 15:21)
Re: Wrong Video...... oops (nt)  by 'RotaxTim'   (18 Aug 2010 @ 15:55)
Oh DAMN..... here's the right one.... I hope  by 'itpro'   (20 Aug 2010 @ 16:48)
Re: Let's codify the discussion  by 'Liam'   (18 Aug 2010 @ 16:20)
Re: Let's codify the discussion  by 'Traxtar'   (18 Aug 2010 @ 16:37)
Re: Let's codify the discussion  by 'AlfieMoon'   (18 Aug 2010 @ 17:28)
Re: Let's codify the discussion  by 'Liam'   (18 Aug 2010 @ 20:00)

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