Is there any science behind pucker factor?

[Defective]

And then you get "antipucker"...

That'd be what happens when you realize you ignored the pucker.

 

[SkyPup]

After the fact Antipucker can also result in the dreaded brown undie syndrome too.

 

[TMcD_in_MI]

I thnk yould have to modify that a little due to the pivot on the front axle, but in general absolutely correct --
larry

Thanks, Larry. I hadn't thought of the fact that the tractor isn't a totally rigid body. I don't have enough physics to deal with stability of non-rigid things -- I'll bet it gets complex.

Tom

 

[SPYDERLK]

So the brain is sensing something besides pure tilt. My theory is this: as you drive, the tractor is bouncing up and down, which causes the tractor to oscillate from side to side. Your brain has a pretty good memory of how long each of those oscillations lasts ("period" is the term, if you remember your physics). The thing is, the closer the tractor is to its balance point, the longer the period of oscillation. When the oscillation occurs near the balance point, the tractor is more or less "teetering"- another name for extended period. So our brains sense this extended period and sends an alarm to our anuses.
Can't prove it though.
John

Real good thinking I think. It occurs to me that the teeter begins symmetrical following the ground, and then as incline progresses, the downhill side gets more and more soft, highlighting the sensory alarm cues.
larry

 

[MossRoad]

Not unless something about the machine changes, like raising the loader or filling an empty fuel tank, etc. Otherwise, the CG is always in the same place relative to the tractor. Relative to the ground is another story.

Lets talk stability for a second. Hold a string on the ground and walk all the way around your tractor until the string is tightly touching all four tires at the ground level. Call that region the base of the machine.

Now, if you drop a plumb bob from the CG of an tractor and that bob points at a spot inside the base of the tractor, then it is stable and won't tip over. When you move onto a slope, the plumb bob will move toward the downhill edge of the base. You're OK as long as the bob stays within the base. If you get to a steep slope where the bob is pointing right at the edge of the base, you're on the razor edge, and you'd better not have had beans for dinner, 'cuz that's all it might take to roll you over. You're basically riding on two wheels. All the while, the CG hasn't moved within the tractor, just it's vertical location relative to the base has.

Same thing is true for fore and aft rollovers.

Hope this helps. If not, sorry!

Tom

I understand what you are saying and it is a good explanation.

I have an articulating tractor. The tractor gets longer and shorter as it bends in the middle. Just standing still on level ground, not moving forward or backwards, with a heavy load in the bucket, if I turn the steering wheel away from straight, the unit will tip on its nose and the rear wheels will come off the ground. If I turn the steering wheel back towards straight, the rear wheels will come back down on the ground. The center of gravity constantly changes as I turn the steering wheel even on level ground. It moves all over the place. In the real world, driving across a slope, the CG changes each time I touch the steering wheel, even if the slope never changes.

 

[Soundguy]

I would think that the center of gravity will change for every change in the longitudinal and vertical axis of the object in question.:D :confused: :confused: :confused:

Please disregard this post. At the time an upcoming endoscopy was occupying my thoughts.

If you replace 'question' with 'in relation to the ground'.. then it would have been ok..

An endoscopy? I think we can let you slide this one time in that case!

Soundguy

 

[Soundguy]

After the fact Antipucker can also result in the dreaded brown undie syndrome too.

Around these parts we call those 'brown alerts'

Soundguy

 

[RobJ]

I think you are all wrong. Pucker factor has nothing to do with CG, tractor weight, tractor position, operator position or inner ear.

To start with, 'puckering' can be brought on by anything that causes a fear response. Anything that scares you can cause you to pucker. So it is not a response simply to body position or a sensation of falling or rolling. One could pucker, for instance, if something heavy fell next to you, or if someone fired a gun at you, etc. It is completely related to the sympathetic component of the autonomic nervous system. The autonomic nervous system controls involuntary body functions. The sympathetic part of the autonomic nervous system controls our 'fight or flight' responses. This is the same system that causes our hair to stand on end, pupils to dilate, goosebumps, racing heart, etc when something scares us. It is also responsible for brown underwear that has been known to occur in seriously frightning situations and 'puckering' is directly related to that phenomenon.

Well I can't go along with this. It all starts with our senses. The one TELLING our brain what is going on. So you shoot a gun at a person and they don't jump, they are blind and can't see what is happening. You sneak up behind someone and say boo....they don't jump...they are deaf(or they are really relaxed!! ). If you are in one of those spinning visual tunnels (you are not spinning of course), to stop the sensation...you simply close your eyes.

If someone points a gun at you and you flinch, your reaction starts with the visual messages sent to the brain, then because our brain is complex and we have watched a lot of TV, we know what will happen to our head if the trigger is pulled. If someone does this in a dark room, no reaction unless you "hear" a shell jacked into the chamber.

And for the record, I see the pucker factor as a figure of speach. Only time I get the pucker factor for real is if I got ahold of some really bad food.

 

[jimg]

It is also responsible for brown underwear that has been known to occur in seriously frightning situations and 'puckering' is directly related to that phenomenon.

Im not getting this at all...if theres pucker then how can things go brown?

 

[Defective]

back up to post #31...