Hill Climbing Primer

CalG · Apr 23, 2014

Perhaps we all can agree that the tension force on the load can NOT exceed the tractive force applied through the tire contact patch.

After all, it's the tractor pulling the load, not vice-verse. (no logs rolling off embankments have entered the scenarios.)

And so, the arm with the most leverage "WINS"!

SPYDERLK · Apr 23, 2014

ovrszd said:
Larry, nope, I definitely know the difference of those two. With the welds, the desire to elevate the front is gone. With the concrete, the desire to elevate the front remains, just as it does with zero tire slippage.

All of them are different in effect. The last is the traction situation.

CalG said:
Perhaps we all can agree that the tension force on the load can NOT exceed the tractive force applied through the tire contact patch.

After all, it's the tractor pulling the load, not vice-verse. (no logs rolling off embankments have entered the scenarios.)

And so, the arm with the most leverage "WINS"!

You got it, Put a metal plate on the ground. Attach two small crescent wrenches to it a few inches apart. Attach a big crescent between them. Stand on the little ones while pulling up on the big one. ... Thats how you pull yourself up by your bootstraps.

Egon · Apr 24, 2014

http://www.google.com/url?sa=t&rct=...fzBhJmRRU6s5EYh0g&sig2=-_GkrwXJW0H6G85j7Ph76A

pictures

SPYDERLK · Apr 24, 2014

Egon said:
http://www.google.com/url?sa=t&rct=...fzBhJmRRU6s5EYh0g&sig2=-_GkrwXJW0H6G85j7Ph76A

pictures

Note their own contradiction as to where tip occurs

Egon · Apr 25, 2014

SPYDERLK said:
Note their own contradiction as to where tip occurs

Note the simple diagram showing those "consolidated within forces"that take place when a flip occurs!

SPYDERLK · Apr 25, 2014

Too simple to tell the real story that the tip is around the ground contact if the tire is not attached to the ground.

Egon · Apr 25, 2014

SPYDERLK said:
Too simple to tell the real story that the tip is around the ground contact if the tire is not attached to the ground.

Really, a tire in float/fly mode?

The tractor rotates around the axle. Looks pretty obvious. It could be made much more complicated but doesn't change the outcome.

You gota a diagram?.

msmith1wa · Apr 25, 2014

I know it is not a tractor but the physics are the same.

Wheelies or wheelstands: From Physclips

CalG · Apr 25, 2014

msmith1wa said:
I know it is not a tractor but the physics are the same.

Wheelies or wheelstands: From Physclips

Unfortunate that the physics of the example are not particularly related to hitch points or pulling a load.

Statics vs dynamics........

CalG · Apr 25, 2014

Egon's request for "diagrams" had me doodling on a bit of scrap paper.

IF one can get over that silly notion that the tractor front end is some how lifted by the pinion gear climbing the ring, a simple vector diagram allows the LOAD to pull on a stationary tractor with equivalent results to the opposite. In fact, the tractor engine need not even be running, and the transmission can be in neutral. The BRAKES must be set however (or the axle shafts welded to the housings ;-)

In such a diagram, The ONLY vector opposing the "pull" from the dynamic load is AT THE TIRE CONTACT with the ground, Opposite and equal to the horizontal component of the "load" vector, regardless of the height or direction of the load vector. Also, infinite tire traction is assumed (right up to the moment when the load lifts the rear wheels off the ground, should that condition exist.)

Something to consider