@#%$&*( trailers
Russ,
I don't think I said anything different about slippage. At least I didn't
mean to (still think 15% slippage is real). Just commented on my take on
the tire failure mode. I don't see slippage at the salt causing tire
failure. I believe that tire failure there is caused by overloading. Tire
slippage at the salt only decreases potential speed.
Examples of tires to study might be Don Vesco's and Bonner Denton's mod
along with Earl's failed tire if it is still available. These are the only
failures that I know of that can be classified as catastrophic or
semi-catastrophic. The rear tires on "Rose" show wear signs (15 passes) but
I think they are safe. We could try to contact Joe Law and see if he would
participate.
On TC use: let's test and see if there is any difference in performance.
Then the discussion may be moot. Also it should apply to Special
Construction only (at first).
Others out there interested in tire analysis? If so, let us know.
Skip (Busy untwisting my tail! My attention was on this last year too)
At 12:33 PM 12/1/01 -0600, you wrote:
>Skip:
>There may be some cases of tire failure that are purely a function of
>overload--
>God knows some of our racers manage to load the hell out of them. But you
>were the
>first one who told me (before I had ever turned a wrench on "the Rose") that
>many
>of the fastest LSR cars had to deal with about "15% wheelspin". I don't
>understand
>why you are saying something different now. And based on my own examination
>(and,
>admittedly marginal expertise)-- I believe that the drive tires on the very
>fast
>lakester pitted near us showed evidence of spinning. There were abrasion
>marks,
>for one thing-- and some cord showing through where the surface had abraded
>away.
>Abrasion marks come from spinning the tires. There was also a little
>blistering,
>and bare places where it appeared that blisters had popped-off. As you know,
>blisters come from heat. Heat (usually) comes from spinning the tires. We
>know
>that that car seems to have the ability to really load the drive tires-- so
>overload may have been a contributing factor (as it may have been in Earl
>Wooden's
>case)-- but seeing the tire abraded down to the cord suggests to me that the
>main
>factor is probably wheelspin.
>Yes, it would be better to get the opinion of a real expert, rather than just
>exchanging opposing hot rodder opinions. Shouldn't be hard to find someone
>with
>sufficient expertise in tire failure modes and post-failure analysis. I
>probably
>bump into one or two at any CART race I work. Can we get a representative
>sample
>of (recently) failed tire carcasses? If so, I would be willing to try to
>recruit
>an appropriate expert to our cause.
>
>There is nothing here that I see as a valid arguement why racers in
non-vintage
>classes should not be allowed to use TC, if they want to.
>Russ
>
>
>Skip Higginbotham wrote:
>
>> Russ,
>> So how about some failure analysis? How can we do that? Others have had
>> tire failures that have not gone 300 even....this year....on new tires.
>> Excessive loading and load deflection? I think it is a real possibility
>> that needs proving or disproving. I think we will find little or no tire
>> slippage and yet tires coming apart. How about it?
>> Skip
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