I don't understand vhy

[4570Man]

OK, OK, I couldn't resist! :laughing:

Anyway, I agree that R4 tires aren't the best for traction, but still, 10K of tractor pulling with 6 wheels gets outpulled by one maybe 4500# pickup truck?

The first is a rigged test. The Dodge appears to be weighted and the tractor operator sucks. Second video is unexplained. That tractor should drag that truck in circles. Maybe something else in front of the truck? The third is a small tractor. For the OP did you use the same length chain in all the conditions? The shorter the chain the easier it's going to pull assuming the chain is hooked at the bottom of the container.

 

[ch1ch2]

The first tractor had a VERY short chain.
Then ve vent to long chains to be able to keep the vehicles apart.
All vith the truck vas a long chain.

 

[bb770]

That Dodge is probably close to 8000#

 

[xring100]

Gas gmc dually curb weight is listed at 6892 lbs crew cab long box denali . Not sure how much the duramax and allison add but id venture to guess its atleast 500lbs

 

[MossRoad]

Don't forget some of these pickup trucks are designed to tow well over 10,000 pounds. 15K, 17K etc... they are meant to pull heavy loads. They have to get the loads moving from a dead stop, and then get them up to highway speeds and keep them there. It's all about the gearing, weight, ability to transfer power to the ground, etc..., vs the resistance of the load.

 

[CalG]

Put those "pulling trials" in the dirt where the ag tread will feel more at home.

Or put slicks on the tractor, that would be fun. Condition them with bleach first though!

 

[ch1ch2]

I got a new key board, so I now have a W.

No doubt the truck has the pulling ability to do a good job. But I can not get out of my mind, the concept of it all coming down to traction.
Given the tractors have tires designed for off-road use, and the tractors have a foot print that I believe is bigger, and a combined weight greater than the truck, I can not conceive of why the truck out pulled them.

When the tractors tires spun, they were moving more dirt and digging a good size hole.
When the trucks tires spin it was not much and the dirt was more like surface dirt. It was not digging a hole.
Which I take that the tractor tires had more grip.
I do not believe I mentioned that the tractor tires are loaded, if that matters.

 

[ovrszd]

Sometimes traction is not about the ability to dig a hole. Few years ago I had a set of tires on my Vacation/hiway driving/4 wheeling Jeep called "Claws". Very aggressive, tractor tire style tread. Worst tires I ever owned. If conditions were anything short of perfect they just dug a hole. :confused3:

 

[MossRoad]

I got a new key board, so I now have a W.

No doubt the truck has the pulling ability to do a good job. But I can not get out of my mind, the concept of it all coming down to traction.
Given the tractors have tires designed for off-road use, and the tractors have a foot print that I believe is bigger, and a combined weight greater than the truck, I can not conceive of why the truck out pulled them.

When the tractors tires spun, they were moving more dirt and digging a good size hole.
When the trucks tires spin it was not much and the dirt was more like surface dirt. It was not digging a hole.
Which I take that the tractor tires had more grip.
I do not believe I mentioned that the tractor tires are loaded, if that matters.

Hmmm.... at that point, I'd look at where the chains were attached to the tractors VS the truck. Were the chains lower or higher, changing the angle of pull? For example, if the chains were attached to the drawbar on the tractor at a low, parallel angle to the ground, it could have been pulling the container forward, not UP, while if they were attached to the trailer hitch on the truck and more of a steep angle, it could have been pulling the container UP a bit, causing less dig-in. Just thoughts? Perhaps hook the tractor back up the way you had it and take some pictures, then hook the truck back up and take some pictures and compare.

 

[ch1ch2]

Yes, I am aware of the importance of tow point angle. Chains were attached to the feet of the container and to the tow bars of the tractors. The chain was attached to the receiver ball of the truck.
I think I have some pictures on my wife's phone. Maybe I can get them latter today.