Correct Wrinkle Wall Slicks at Rest Vs. Under Torque?

[Skip]

Does anyone make correct wrinkle wall slicks sitting at rest, not with the wrinkles up the sidewall under torque? What I'm looking for is wrinkle wall slicks with the pronounced "pooch" at the bottom portion, wrinkle below the bottom of the rim.

If you look at wrinkle wall slicks at rest you will notice that they only wrinkle up the sidewall when hooked up under power. At rest they have a pooch resembling a slick that could use some more air.

[Casey]

I've never seen any, but have considered trying to make some. I think even regular (i.e. non wrinkle wall nor pie crust) slicks with a small amount of sidewall bulge at the 6:00 position would be nice to have.

[DPNM]

I found a few on feeBay. One seems original, one cast in rubber and one cast in resin. They might be what you are looking for. Put these item numbers in feeBay searchbox.

370941339995

390677070002

350932240643

Seems I remember that one mfg had them in either an early pro-stock or early funny car kit. I just can't remember which mfg or kit(s). I am not familiar with the "SandStinger" kit referenced in the first ad.

Edited November 24, 2013 by DPNM

[Skip]

I found a few on feeBay. One seems original, one cast in rubber and one cast in resin. They might be what you are looking for. Put these item numbers in feeBay searchbox.

370941339995

390677070002

350932240643

Seems I remember that one mfg had them in either an early pro-stock or early funny car kit. I just can't remember which mfg or kit(s). I am not familiar with the "SandStinger" kit referenced in the first ad.

Yep, those are wrinkly wall slicks, they are all good examples of wrinkle wall slicks under power. At rest the bulge would only be in approximately the 4 to 8 position almost a line across the lower portion of the slick that doesn't meet in the middle. I believe you are thinking of Monogram in their Funny Car kits, maybe the Badman too.

Casey, if memory serves me correct, I didn't think that pie crust slicks got wrinkle walled. I thought that most of the early slicks had their beginnings as recapped street or light duty truck tires, I could be wrong. It's happened before! Several times in fact!!

I remember an old Model Car Science article where they heated the slick over a candle then pressed it down on the workbench to flatten the bottom. It didn't get the pooched bulge at the bottom though. Funny that no one has ever produced these.

[zenrat]

It's odd that no-one appears to have produced weighted tyres for car models and yet they are almost de-rigeur in the model aircraft world.

[High octane]

Have you checked out the ones from Speed City Resin?

[Skip]

Have you checked out the ones from Speed City Resin?

Not yet, but I'm going over there next! Thanks.

Those are probably the closest I've seen so far, they still represent what you would see just as the slick hooks up.

Edited November 28, 2013 by Skip

[sbk]

It's odd that no-one appears to have produced weighted tyres for car models and yet they are almost de-rigeur in the model aircraft world.

So true!

[Art Anderson]

Check me if I'm wrong here, but here goes: Any race car (or any vehicle period!) running a "locked rear axle" (no differential whatsoever), when turning, particularly at a very low speed (such as in a garage, or garage/pit apron) has the characteristic of one tire (the inside tire when the car is turning) trying to "slow down" while the other tire (the "outside" tire trying to turn faster due to the different radius each tire is being rolled around in any turning of the car. (All one need do is be present, watching and listening when a crew is pushing such a race car by hand!).

With the low air pressure in wrinkle-wall slicks, it seems to me that just about any dragster, shut down, after having been moved in such a manner would exhibit sidewall wrinkling on one slick as though it were hooked up at the starting line out on the strip, while the opposite slick's sidewall would be wrinkled at least slightly as though it were under power in reverse, would it not? If I'm correct here, then this seems to me to be an answer if one were positioning a model as if it were in the pits, or perhaps just after turning onto the return road before the push truck or other tow vehicle were starting to roll it back to the pits (the same would be true if the model were being posed as coming out of a staging area, but before it was rolled down toward the starting area in a straight line.

Of course, for say, display at a car show, it would seem likely that dragsters and funny cars get positioned in their respective display areas in such a manner (or the slicks aired up a bit more, to allow the sidewalls of the slicks to be more or less unwrinkled, or at least such wrinkles as appear would not be in a pattern showing any tendency of the wheel rim to try to twist the tire against the pavement surface.

As for weighted tires, and their "squish" area above their "footprint" or "contact patch" (where the rubber meets the road), it would be difficult to tool automotive tire treads at all easily with that in mind. As it stands currently--model car tire molds are done on fairly sophisticated milling machines, which make them by rotating a round steel "hob" against whatever milling cutters are used, be they old-fashioned "side mill" cutters, or even the more modern electro-discharge milling units. It's just one of those things that any model kit designer or tooling engineer would have to consider as "cost VS benefit", from what I have learned and observed over the years.

As for realism, while I am well aware that a lot of scale aircraft kits do have tires exhibiting a squish pattern to them, if you look at them, they are generally molded in hard styrene, as opposed to the softer PVC or even synthetic rubber we model car builders tend to prefer. In addition, few scale model aircraft kits have tires with much, if any, very well-defined and complicated tread patterns. In addition, many such model aircraft tires with weighted squish appearance do seem to have that visual feature rather overstated.

As I said, "check me if I'm wrong".

Art

[Terry Sumner]

Wrinkle wall slicks *at rest* display a wrinkle running in both directions..unless they've been aired up in pressure for display purposes. ONLY when under hard launch will a wrinkle wall slick exhibit the standard one-way wrinkling that is so prevalent ... and wrong ... in most model kit tires. Here are but two examples of a wrinkle wall slick at rest.

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