F******* Potholes

[philw696]

It's interesting to do comparisons of the cars kerb weights over the decades.
My 1980 BMW 628csi which has luxuries we take for granted like
Air conditioning
Electric windows and locks
Power steering
Lots of leather trim
Full size spare wheel and a big tool kit
1460 KG
My 96 Jaguar XJ6 4.0 LWB
1800 KG
Everything works as it should on both cars and extremely comfortable rides too.

 

[c4sman]

Too many variables to make in informed conclusion. Design of the wheel size and depth of the hole, impact speed and direction, previous damage, weight of car, shape and severity of the edge of said pothole....etc

This was the design of wheel on my CLS. Went through 3 new wheels and 2 of them were ones I had bought brand new from Merc and bent again. They are made from chocolate. As I had rarely bent wheels on other cars at the time (circa 10 years ago when the roads were better than today).

 

[Scaf]

Too many variables to make in informed conclusion. Design of the wheel size and depth of the hole, impact speed and direction, previous damage, weight of car, shape and severity of the edge of said pothole....etc

I agree, lots of variables including the drivers ability to see the potholes
I expect I have spoke too soon and will lose as wheel on the way to work Tuesday
The Vanquish has “forged” alloy wheels which I was told are lighter and stronger.

 

[philw696]

It seems SUVS are a Big part of the problem.
SUVs are making Britain’s potholes worse, say scientists | Transport | The Guardian https://share.google/QbMzrydgoXiGbpAYT

 

[midlifecrisis]

Proof at last and an electric SUV is only going to exacerbate the issue. Maybe RFL should include a weight component.

 

[Phil H]

Proof at last and an electric SUV is only going to exacerbate the issue. Maybe RFL should include a weight component.

With thinking like that you could go far.

I hereby nominate MLC for the office of Prime Minister.

 

[RoaryRati]

I gather it's also the way EV's accelerate - linear progression or some other physics related issue that's way beyond my single brain cell

 

[midlifecrisis]

I gather it's also the way EV's accelerate - linear progression or some other physics related issue that's way beyond my single brain cell

Torque induced tearing. Tarmac is a elastic compound unlike concrete, it moves and can cause small tears in which water can seap into. When that water freezes in crack the hole gets bigger and potholes are formed.

 

[trevorrevver]

It seems SUVS are a Big part of the problem.
SUVs are making Britain’s potholes worse, say scientists | Transport | The Guardian https://share.google/QbMzrydgoXiGbpAYT

I don't understand how the typical SUV "exert five times more force on the road than the typical passenger car, " while weighing only 200kg more, i.e. less than 10% more.

 

[CatmanV2]

I don't understand how the typical SUV "exert five times more force on the road than the typical passenger car, " while weighing only 200kg more, i.e. less than 10% more.

Maximum torque from standstill I suspect has something to do with it.

And depending on how they are 'defining' force, the kinetic energy applied as the car suspension reacts to bumps will be defined by MV^2 so a small increase in mass will have a large increase in the impact on the road surface.

Or I could be utterly wrong

C

 

[midlifecrisis]

Maximum torque from standstill I suspect has something to do with it.

And depending on how they are 'defining' force, the kinetic energy applied as the car suspension reacts to bumps will be defined by MV^2 so a small increase in mass will have a large increase in the impact on the road surface.

Or I could be utterly wrong

C

Very plausible.
Momentum is indeed mv².

 

[Gazcw]

Very plausible.
Momentum is indeed mv².

Or it could just be sht roads!

 

[midlifecrisis]

Or it could just be sht roads!

As I said before tarmac is elastic, even race tracks get rutted and uneven at braking points

 

[anthonys]

Very plausible.
Momentum is indeed mv².

I'm trying to work out what you mean here, since the force will scale linearly with the mass. It's velocity that's squared, but torque isn't speed unless you're suggesting that electric cars are travelling significantly faster than ICE and even then presumably the effect of travelling a bit faster at low speed is less impactful than a small number of cars at higher speeds where V squared will become more significant. Or have I completely misunderstood? Either way I suspect that the real challenge will be when heavier vehicles like van, busses and lories all electrify since they're several times heavier than most cars, which presumably is the main concern unless it's the pressure per square inch of contact rather than total weight that matters most.

 

[trevorrevver]

I suppose may SUVs have stuff suspension in an attempt to make them handle thereby increasing shock loading on surface imperfections.

(Momentum is mv, no squaring of speed. Kinetic energy is 1/2(mv^2).)

 

[CatmanV2]

I suppose may SUVs have stuff suspension in an attempt to make them handle thereby increasing shock loading on surface imperfections.

(Momentum is mv, no squaring of speed. Kinetic energy is 1/2(mv^2).)

This.

As I said before tarmac is elastic, even race tracks get rutted and uneven at braking points

Also this. There's a set of lights on the Potter St bypass in Harlow where it goes up hill to one of the M11 junction. You can clearly see where the lorries ripple the road surface as they pull away from the lights.

C

 

[Scaf]

I am still laughing……. talk about Karma

 

[CatmanV2]

Oh that's priceless

C

 

[zagatoes30]

I bet that pothole was fixed fast

 

[Nibby]

I hit a nasty one in the Fiesta, buckled the wheel and put a nasty bulge in the tyre, had get a new tyre quick as MOT was next day.