Blow out proof tires

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Originally Posted By: Astro14
You're hearing horror stories of gross driver error (but the news never says that...). Google Car and Driver's test with a Ford Explorer - they set up explosive loss of air and couldn't get the thing to roll over...even if they let go of the wheel.

When the Volvo's tire (240 wagon with a 3,000lb trailer) went with a bang - I had to counter the bit of pull, the tire was flapping, I slowed, gently applied the brakes and pulled off the road. My then-2-year old daughter was asleep in her car seat in the back...she didn't even stir....

Keep your hands on the wheel. Steer the car. Don't panic.


Yep. Here's the article:

http://www.caranddriver.com/columns/why-are-ford-explorers-crashing

"'I had a little trouble getting up to 70 mph in the quarter-mile, but once I was there and the tire blew, the Explorer didn't do anything tricky or unstable. It just went straight ahead. I didn't even have to brake much because the deflated tire produces a lot of drag and slows the car quite a bit.'

So far, Webster had not applied the brakes very hard during any of the runs. That's because we believe that in the case of a blowout, the first priority is to maintain stability, and one of the ways to do that is to avoid any sudden control inputs, such as hard braking. Since the Explorer was so stable, however, Webster and I decided to see what would happen if we applied the brakes progressively harder. The answer was essentially nothing. Other than applying a little steering correction to the right, because the old Explorer's brakes pulled to the left, Webster reported no control problems during moderate braking.

During the next run, Webster braked quite a bit harder. Same result. Finally, Webster applied the brakes as hard as he could -- hard enough to make the ABS pulse. Other than some minor wiggling, which would have been easily contained within an average highway lane, Webster reported no drama.

One might reasonably ask how much of the Explorer's stable performance could be attributed to Webster's driving skill and extensive racing and testing experience. It's a good question, and to address it, we mounted a video camera inside the Explorer to record Webster's control inputs. We could see that they were every bit as minimal as he reported to us.

But Webster was willing to demonstrate the Explorer's inherent stability even more conclusively. For our last 70-mph blowout run, Webster removed both his hands from the steering wheel and was holding them up with his palms clearly visible in the windshield when I triggered the toggle to blow the tire. Again, the Explorer continued straight ahead."
 
First, "blowouts" - whatever definition you use - are rare events.

Second, there are some things that you can do to prevent some of the "blowouts" - proper inflation pressure, regular pressure checks, rotation, etc.

The rest are beyond your control. Don't worry about them.
 
Search for "tweel". It is experimental.
tweel-airless-tire-2.jpg
 
Benefits of the Tweel

The heart of Tweel innovation is its deceptively simple looking hub and spoke design that replaces the need for air pressure while delivering performance previously only available from pneumatic tires.

The flexible spokes are fused with a flexible wheel that deforms to absorb shock and rebound with ease. Without the air needed by conventional tires, Tweel still delivers pneumatic-like performance in weight-carrying capacity, ride comfort, and the ability to "envelope" road hazards.Michelin has showcased a potentially disruptive technology with significant ramifications for the future for mobility: an airless, integrated tyre and wheel combination dubbed the TWEEL (i.e. Tyre/WhEEL) .

This is obviously disruptive technology....something like"Zero Point energy.......

We all know that the"Market" hates dispuptive technology...true?
 
Originally Posted By: spock1
This is obviously disruptive technology....something like"Zero Point energy.......

We all know that the"Market" hates dispuptive technology...true?


It's only disruptive when it becomes better than existing technology at a comparable cost. I doubt it's there yet.
 
We seem to be getting closer to the illusive"Blow-Out Proof"tire.The tire-wheel, better known as"Tweel"-which has no air, would appear to be the "Holy Grail"of tires.
Our tire engineer friend, Capriracer, may have some comments to add to this discussion...being very qualified and up to date in that field.
 
Originally Posted By: spock1
.........Our tire engineer friend, Capriracer, may have some comments to add to this discussion...being very qualified and up to date in that field.


Thank you for those kind words. Here's my take.

There have been a few attempts at changing tires over time. Some have been successful (radial tires, donut spares). Some have not (inverted flange - I know! You never heard of them - which proves my point)

The latest has been RunFlats - the stiff sidewall version. They have been around for quite a while, but haven't made much of a splash - but they haven't gone away either.

So having seen a lot of ideas come and go, what makes one idea work and another not?

First, the idea has to integrate into the system seamlessly. The system requires that any new tire be available almost anywhere at any time. Also, there has to be a clear advantage with little or no compromise in the other areas.

So let's examine RunFlats and compare them to the Tweel, and see how that would stack up.

The RunFlat fits on existing wheels and uses the same sizing system as regular tires - a plus. The tweel bolts up, but each car has different bolt pattern - complicating the fitment issue.

The RunFlat does everything the same as a regular tire, except that it is heavier and rides a bunch worse. The ride thing might be minimized by careful selection of shocks and springs - and that appears to be happening.

The tweel? Lot's of unknowns there, but I am going to guess that the ride harshness is on the order of RunFlats. And the weight is probably worse than the RunFlat. I suspect there are other issues. I note that Michelin has been somewhat less than forthcomming about the specifics - and you can be sure the engineers at the OEM's are asking those kinds of questions.

I recall that Pax tires which you could only get through a Honda dealer - and I am sure that all the OEM's are aware of the difficulty with that and don't want to be the subject of a class action lawsuit, so they would proceed very cautiously.

There's also the issue of the spokes. They would have to be covered to prevent out of balance issues. I'm sure the stylists are all excited about the possibilities, but until the technical issues are resolved, they won't be given much of a chance to work their magic.

So I think the first key is what are the ride, handling, rolling resistance, wear, durability, traction, etc. properties and how do they compare? If there is a significant disadvatage in any one property, you can be sure this will not even get off the ground.
 
I have had a low speed (
With respect to rollovers, I had the front left hub (manual locking) on an F250 freeze up and fail. I lost the whole wheel including the brake assembly. Even when sliding down the road on the axle, I was able to safely bring it to a stop on the side of the road. Before anyone gets onto me about repacking bearings, it was the first time I had driven that particular work truck and I had not been responsible for the maintenance before that.
 
Originally Posted By: Coprolite
I have had a low speed (
With respect to rollovers, I had the front left hub (manual locking) on an F250 freeze up and fail. I lost the whole wheel including the brake assembly. Even when sliding down the road on the axle, I was able to safely bring it to a stop on the side of the road. Before anyone gets onto me about repacking bearings, it was the first time I had driven that particular work truck and I had not been responsible for the maintenance before that.



So you survived both experiences.I find this very reassuring.
Thanks for your input.
 
If you are aware of your circumstances while driving, anticipate events and don't freak out, things are much easier to deal with.

During the pickup incident, I could tell something was wrong and I was able to cut my speed from 65 to about 30 before losing the wheel.
 
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