Community Forums

Gordon Dewald · 03-25-2018, 01:47 PM

Quote:

Originally Posted by manwithnorv

Wow, i don't know what ribbed or lug tires are i figured they'd be either all weather or all terrain or M / S or something like that

Ribbed are the smooth tires with a non aggressive tread (some call them highway tires), lug are the all terrain, M&S, etc that have a much more aggressive tread.

Arizona · 03-25-2018, 01:49 PM

We park in the sand at the dunes and our duel wheel mohos only get stuck occasionally where the duel wheel trucks with 5ers even when loaded get stuck a lot. We’ve talked about it over the years but can’t figure out why.

RoadEyePie · 03-25-2018, 02:40 PM

Quote:

Originally Posted by Arizona

We park in the sand at the dunes and our duel wheel mohos only get stuck occasionally where the duel wheel trucks with 5ers even when loaded get stuck a lot. We’ve talked about it over the years but can’t figure out why.

So if I don't park in the sand, I'm good to go....right?

J Birder · 03-25-2018, 02:54 PM

Quote:

Originally Posted by 325BH

The reason is the PSI (pounds per square inch) of tire on the ground.

For example: 4,500 lbs on two tires has twice as much weight per tire on the ground than four tires. Each tire will have 2,250 lbs on the contact patch on an SRW. The DRW will only have 1,125 lbs per tire. When you spread the load across a greater area, there is less friction.

Pickup trucks get lousy traction with an empty bed for this very reason (relatively light weight). A DRW is even worse — when empty.

2 or 4 wheel drive has nothing to do with it... although having 4wd helps get out of situations when the rear isn’t getting traction.

I think you've invented some new physics. Friction is equal to the normal force (weight) times the coefficient of friction. Surface area has nothing to do with it/

Imagine a brick, where all sided have the same finish, and thus, the same coefficient of friction. Lay it flat, set it on edge, or stand it on end. Each case will have drastically different surface area, but exactly the same amount of friction.

See https://www.school-for-champions.com...3Zch1hEhttp://

Joel

RoadEyePie · 03-25-2018, 03:50 PM

Quote:

Originally Posted by J Birder

I think you've invented some new physics. Friction is equal to the normal force (weight) times the coefficient of friction. Surface area has nothing to do with it/

Imagine a brick, where all sided have the same finish, and thus, the same coefficient of friction. Lay it flat, set it on edge, or stand it on end. Each case will have drastically different surface area, but exactly the same amount of friction.

See https://www.school-for-champions.com...3Zch1hEhttp://

Joel

So, are you saying the amount of friction is the same for 2 tires as 4 tires, given the weight it the same? If so, why do the dually dudes get stuck on wet grass when SRW don't....based on what I've read about them...

J Birder · 03-25-2018, 03:58 PM

Quote:

Originally Posted by manwithnorv

So, are you saying the amount of friction is the same for 2 tires as 4 tires, given the weight it the same? If so, why do the dually dudes get stuck on wet grass when SRW don't....based on what I've read about them...

I didn't say that at all. What I said, is that friction is independent of surface area. Tires are a complicated question. unlike solid objects, they deform when loaded, and the coefficient of friction is (at least partly) a function of the deformation.Dual tires may have a lower coefficient because they deform less, but it is not a function of surface area.

Joel

RoadEyePie · 03-25-2018, 05:03 PM

Based on the number of folks pulling with DRW's, I'm going to conclude that it's not going to be a problem.

Gordon Dewald · 03-25-2018, 07:37 PM

Quote:

Originally Posted by Arizona

We park in the sand at the dunes and our duel wheel mohos only get stuck occasionally where the duel wheel trucks with 5ers even when loaded get stuck a lot. We’ve talked about it over the years but can’t figure out why.

Going to depend on a number of things. Without getting too complex.

Our MH has 14,000 on front and 23,000 on drive (tag air dumped). Plus a trailer with 12,000.

Guessing at the truck and trailer as I do not have the numbers with us. Truck will have 4,000 on front tires, 10,000 on drive and 14,000 on trailer.

Truck has less traction than MH.

Geodude · 03-26-2018, 05:19 PM

I'm almost eight weeks into my first dually, so picked it up in early February, aka the dead of winter, and have been driving it most days, heavy snowstorms included. I find it handles the snow just like a SRW truck, city or highway, deep snow or not.

I too was concerned about this but it has turned out to be a big non-issue.

08Carriage · 03-27-2018, 04:53 PM

I have owned a dually 4x4 since 1995. Driven in the northeast and Canada the more weight the better but that is true with any truck unless it's overloaded
The Weather dictates how you drive with any truck
Many a SUV has driven by me only to be off the road in a snow storm heading to Vermont to go snowmobiling

Airmech · 03-28-2018, 01:11 PM

I used to drive a dually as a daily driver in wi. Never had any problems with the snow. Used the 4x4 occasionally when needed. Even rescued a stuck camper that was digging holes because they were 4x2. Once you get used to driving it, really no condition will get you stuck, as long as your smart about it.

aether_one · 03-28-2018, 01:29 PM

Quote:

Originally Posted by J Birder

I think you've invented some new physics. Friction is equal to the normal force (weight) times the coefficient of friction. Surface area has nothing to do with it/

Imagine a brick, where all sided have the same finish, and thus, the same coefficient of friction. Lay it flat, set it on edge, or stand it on end. Each case will have drastically different surface area, but exactly the same amount of friction.

See https://www.school-for-champions.com...3Zch1hEhttp://

Joel

Would that be static friction or dynamic friction? How much friction exists if the MH is not moving or trying to move? What about rolling friction or Viscose friction? Does that come into play?

Surface area does indeed contribute to the Force of friction. It affects the coefficient of friction which varies depending om multiple factors, not just the material and finish.

RoadEyePie · 03-28-2018, 01:42 PM

Ok, here's what we know.

DRW's have 4 rear tires, SRW's have 2 rear tires. Friction has something to do with it. And people up north who know how to drive in snow, don't really have problems, but some people who drive on the beach do. It'll probably be fine if I'm smart about it.

Got it....good thread.