Physics debate

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GrimSurfer
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Re: Physics debate

Post by GrimSurfer » Mon Jan 09, 2023 10:28 am

lowangle al wrote:
Mon Jan 09, 2023 10:17 am
This is how I look at tip pressure. Let's assume your skis are mounted with your boot on boot center. When you put weight on that lead foot with even pressure from toe to heel the ski is weighted evenly. As soon as you put more weight towards your toes you are generating tip pressure. Any extra weight applied to the ski ahead of the boot center mark is tip pressure in my book.

"Tip pressure" as a term has been around a long time, it is what it is, no need to change it.
The term is misleading. It is more of an idiom, in fact.

The “tip of a ski” doesn’t mean the same thing as the “front of the ski”, even though some might think that’s the way it will be interpreted. There is also the issue of consistency…

If you say “I cracked my *ski tip*” are people going to interpret that as cracking anywhere along the front half of the ski? Or if you say that “the *ski tip* rises as pressure is applied to Norwegian rocker”, are we left to assume that the front half of the ski levitates?

Of course not.

So let’s use descriptive terms whose meaning doesn’t change radically with context.
Last edited by GrimSurfer on Mon Jan 09, 2023 10:35 am, edited 2 times in total.
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Re: Physics debate

Post by lowangle al » Mon Jan 09, 2023 10:34 am

I think it's best to stick with what is know and mostly understood to the rest of the ski world, so as not to create more misunderstanding.



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GrimSurfer
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Re: Physics debate

Post by GrimSurfer » Mon Jan 09, 2023 10:38 am

lowangle al wrote:
Mon Jan 09, 2023 10:34 am
I think it's best to stick with what is know and mostly understood to the rest of the ski world, so as not to create more misunderstanding.
Using idiomatic expressions among people of different knowledge levels, or people whose mother tongue isn’t English, isn’t a great idea.

Using those expressions in a discussion on physics isn’t a great idea either.

Just sayin… LOL

The relevance of *ski tip* will become apparent soon enough, when people are utterly misled by pressure discussions.
We dreamed of riding waves of air, water, snow, and energy for centuries. When the conditions were right, the things we needed to achieve this came into being. Every idea man has ever had up to that point about time and space were changed. And it keeps on changing whenever we dream. Bio mechanical jazz, man.



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Re: Physics debate

Post by bauerb » Mon Jan 09, 2023 11:48 am

I belong to a FB group focused on Nordic skiing. there's a guy in that group that is constantly trying to invent "better" ways to XC ski. his argument is that generally accepted fundamentals are "too hard" for most people to learn, and should be left to the elites only, for everyone else, they should learn his crackpot technique abominations. he is very amusing



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Re: Physics debate

Post by GrimSurfer » Mon Jan 09, 2023 12:19 pm

bauerb wrote:
Mon Jan 09, 2023 11:48 am
I belong to a FB group focused on Nordic skiing. there's a guy in that group that is constantly trying to invent "better" ways to XC ski. his argument is that generally accepted fundamentals are "too hard" for most people to learn, and should be left to the elites only, for everyone else, they should learn his crackpot technique abominations. he is very amusing
This is an offshoot of the secret fire phenomenon.

My brand of crazy is based on things like “the laws of physics apply to skiing”, “gravity matters”, etc. Not my ideas, but those of Isaac Newton. So accepted that they have become scientific laws.

Crazy shit, eh?
We dreamed of riding waves of air, water, snow, and energy for centuries. When the conditions were right, the things we needed to achieve this came into being. Every idea man has ever had up to that point about time and space were changed. And it keeps on changing whenever we dream. Bio mechanical jazz, man.



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Re: Physics debate

Post by Stephen » Mon Jan 09, 2023 12:20 pm

@GrimSurfer, maybe you could help us out by posting a picture of a ski with each part labeled with the proper terms, with demarcation points showing where each term applies, so we can stop the poor use of language and terminology in our discussions? It seems like we are wasting a lot of time misunderstanding one another.



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Re: Physics debate

Post by GrimSurfer » Mon Jan 09, 2023 12:24 pm

The last time I provided pictures, you complained about those. So why would I waste my time doing that for you again?

I provided examples of three ways that *ski tips* could be interpreted. That should be enough to convince you of the need to avoid idioms.
We dreamed of riding waves of air, water, snow, and energy for centuries. When the conditions were right, the things we needed to achieve this came into being. Every idea man has ever had up to that point about time and space were changed. And it keeps on changing whenever we dream. Bio mechanical jazz, man.



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Stephen
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Re: Physics debate

Post by Stephen » Mon Jan 09, 2023 12:27 pm

Ah, we’re playing Calvin Ball.



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Re: Physics debate

Post by DG99 » Mon Jan 09, 2023 2:58 pm

tkarhu wrote:
Mon Jan 09, 2023 2:53 am
DG99 wrote:
Mon Jan 09, 2023 12:53 am
Wow, late to the party, but I really don’t get this.

Of course, torque forward it applies pressure to the front of the ski.
I wonder too, how can you pressure the front of a ski with free heel bindings? Pushing front ski downwards, there seems to be only a free rotating axle in free heel bindings, how can you push with that.

You can pressure a rear ski by pressing your heel because then you have your front attachment to push against. There you have two attachment points. But in the front I feel I can only pressure the top of a ski, for example when I need to lift snow. There you have also contact at both toes and heel.

EDIT: I guess NNN-BC flexors and NN cables allow to pressure ski tip. Was it @Verskis who measured this. That lets you pressure rear ski tip to some extent, was it so.
I think you got it. Most or all nordic bindings resist forward pressure, based on those flexors, heel cables, etc. Produces Tip Pressure, but not actually on the very tip point that’s elevated above the snow of course. Mostly on the back ski of course in a telemark turn, since the front ski has the heel flat, but you can get some forward pressure on the front ski in a tele turn by pressing thru the cuff.



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Re: Physics debate

Post by fisheater » Mon Jan 09, 2023 3:19 pm

DG99 wrote:
Mon Jan 09, 2023 2:58 pm
tkarhu wrote:
Mon Jan 09, 2023 2:53 am
DG99 wrote:
Mon Jan 09, 2023 12:53 am
Wow, late to the party, but I really don’t get this.

Of course, torque forward it applies pressure to the front of the ski.
I wonder too, how can you pressure the front of a ski with free heel bindings? Pushing front ski downwards, there seems to be only a free rotating axle in free heel bindings, how can you push with that.

You can pressure a rear ski by pressing your heel because then you have your front attachment to push against. There you have two attachment points. But in the front I feel I can only pressure the top of a ski, for example when I need to lift snow. There you have also contact at both toes and heel.

EDIT: I guess NNN-BC flexors and NN cables allow to pressure ski tip. Was it @Verskis who measured this. That lets you pressure rear ski tip to some extent, was it so.
I think you got it. Most or all nordic bindings resist forward pressure, based on those flexors, heel cables, etc. Produces Tip Pressure, but not actually on the very tip point that’s elevated above the snow of course. Mostly on the back ski of course in a telemark turn, since the front ski has the heel flat, but you can get some forward pressure on the front ski in a tele turn by pressing thru the cuff.
Winner, winner, chicken dinner!



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