Drawbar pulling question

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One of these may help in regards to logs digging in:portable-winch-pca-1290-skidding-cone.
From end weights will go a long way to keep the nose down.
If you ever get to a tractor pull, notice those tractors have "wheels bars" attached to the backs of the axle to prevent that which you are worried about.:

 

[Egon]

I’d hate to trust those bars to prevent a backflip!

 

[jonsstihl]

they might just sink in the mud and you would still go over

 

[oosik]

The simple answer. Leave the drawbar in its OEM position. Run a chain from the drawbar to the log. If this does not work - get a log arch. If this does not work - get a larger tractor. Most anything else will cause damage, injury or a back flip.

 

[Cougsfan]

You for sure don't pull backwards with a 4x4, of any type.

Why? I am always amazed when I find I have done things wrong my whole life without ever having a problem.

 

[etpm]

Why? I am always amazed when I find I have done things wrong my whole life without ever having a problem.

I don't know if this is true and it should apply to both 4 and two wheel drive but I was told that the pinion gear could break. It was explained to me that the way the differentials are generally made results in the pinion gear being subjected to less stress when driving the vehicle forward. This makes a little sense to me after setting up the front diff in my jeep years ago, getting the tooth contact pattern right. Anyway, having the diff apart it was easy to see that the pinion gear was stronger driving in one direction than the other. This was because of the shape of the teeth and how they contacted the ring gear. But I don't know how much weaker the pinion is when driving in reverse.
Eric

 

[oosik]

Yea-hootie-christ. Another wives tale. I've never hesitated to pull in reverse with either of my tractors. The first one - 27 years and no damage. Now the 2009 Kubota M6040 - no damage.

Both were/are 4WD. Like Cougsfan - all my life and doing it wrong. Give it a break.

Librium will help your fears Roustabout.

 

[arrow]

they might just sink in the mud and you would still go over

Depends on his terrain. Bottom plates could always be made larger for softer ground.
Ya think he'd rather have nothing as opposed to these?

 

[arrow]

I’d hate to trust those bars to prevent a backflip!

Exactly what they're made for.
I guess one would have to see them in action to be secure with their workings.

 

[RoyJackson]

Watch tractor pulls illustrates having the attachment point below the axle does not keep the front from coming up. As someone else stated, the pivot point is the tire to ground contact point. Pulling tractors have often have their front end raise, and because the drawbar attaching point is well behind the ground contact point, when the front end raises, the drawbar attaching point lowers until reaching an equilibrium. Sum of the moments must equal zero. If tires get a super bite, there is a very large moment trying to raise the front. As seen in many videos, releasing the clutch immediately reverses the moment diagram and the front end comes down with full weight of the engine(s) in front of the ground contact point providing the wallop breaking tires off, axles off, and even splitting tractors. Operators illustrating the same phenomena are those chaining trees to the rear axle. In those cases torque might be enough to flip the tractor.

I'd be very surprised if most tractors have the HP or torque to do what a dedicated tractor for pulls can do