Hill Climbing Primer

[k0ua]

I agree. The challenge is finding a way to do the job with the tool you have, not run out and buy a bigger tool.....

Well, I know the log arch and snatch block I suggested a few days ago will work with what he has.. Would probably work with a good heavy garden tractor.

 

[SPYDERLK]

Correction guys: 25' rise over 75' travel is a 33% slope NOT a 33 DEGREE slope. You cannot climb a 30 degree slope at all. But that's just a terminology point.
.

NO. NO. The slope is 18 degrees and he has 4wd and plans to carry them. Do not back up. Engage diff lock when theres no or only a low/slow difference in wheel rotation. Carry low. Dont work when muddy.
larry

We got thru this early.

 

[SPYDERLK]

Oh come on ! It matters WHICH WAY it rotates ! If the pull point is below the axle, that rotates the tractor to put more weight on the front wheels. If the pull point is above the axle it rotates the tractor to put less weight on the front wheels. No way around those facts. Physics and farmers must mix...

Course it matters which way it rotates -- the wheels that is. ... Now, - Physics says that a pull point below tire contact rotates the tractor to put more weight on the front wheels. Pull above the ground and the tractor can backtip.
larry

 

[SPYDERLK]

I suggest you go back and reread Egon's statement that you referred to. Key point is "enough traction".

No. The key point is "Dont matter how low you hitch". Falsifies Egons whole statement.

 

[JWR]

No. The key point is "Dont matter how low you hitch". Falsifies Egons whole statement.

Try this: instead of listening to a bunch of opinionated old farts like us, go to the manuals on the first 5 tractors you pick at random. Open and read what it says about towing and Warnings. Every single one will tell you, caution you, to tow with points on the tractor BELOW the center line of the rear axle. The danger is potentially tipping the tractor over backwards in extreme cases if the tow point is above the axle. That is why ALL drawbars are located below center line of the axle. It is obvious to me and most of the readers. If not, go ask the manufacturers. And if that still leaves you feisty and wanting to argue, go to Nebraska Tractor Test Laboratory, University of Nebraska, Lincoln Nebraska 68583-0832 and ask them. They are the only non-profit tractor test lab in the US. They have email at tractortestlab@unl.edu . The End.

 

[ovrszd]

No. The key point is "Dont matter how low you hitch". Falsifies Egons whole statement.

Awww Larry,,,, I thought we had covered this already??

If the rear tires do not lose traction and the drivetrain has the power to continue to turn the pinion and the load does not move, the tractor will do a wheelie, "dont matter how low you hitch" That is a true statement and all of the analysis given by yourself and CalG proves it.

 

[JWR]

Course it matters which way it rotates -- the wheels that is. ... Now, - Physics says that a pull point below tire contact rotates the tractor to put more weight on the front wheels. Pull above the ground and the tractor can backtip.
larry

You cannot tip the tractor backwards by pulling at any level between the ground and the midline of the axle for the following reason: there will never be enough traction for the rear tires.

 

[ovrszd]

You cannot tip the tractor backwards by pulling at any level between the ground and the midline of the axle for the following reason: there will never be enough traction for the rear tires.

Your last few words is the point of contention. There are those that say it can NEVER tip over backwards even if the rear tires maintain traction. You last comment is the truth. The tractor will lose traction and thus not tip over backwards. Depending on application you may experience a loss of control momentarily, but no tip over backwards.

 

[JWR]

OH Now I see, You mis-understand.

I do fully embrace the front end lifting when power is applied and resistance is present.

But the reaction occurs at the GROUND. Not at the pinion. As I have repeatedly stated. The pinion forces are taken out inside the transmission. It is only when the WHEELS try to move relative to the ground that ANY forces appear outside of the tractor. For the WHEELS /TIRES are the ONLY part of the tractor that can apply "tractive force". Without that, no other forces can be generated that will disturb the motionless tractor.

Silly to believe otherwise

Absolutely!.

Amen brother. Correct.

 

[msmith1wa]

Hear are a couple more documents to look at.

National Ag Safety Database - Tractor Overturn Hazards

The Journal of the Society of Automotive Engineers - Society of Automotive Engineers - Google Books

http://www.iagre.org/sites/iagre.org/files/docs/Ross Macmillan Chapter 6.pdf