I too find this issue a bit comical at times, but Weight and Pressure are two different concepts
- that most people use interchangeably (and that's probably OK in skiing chat).
Weight is expressed by a single specified Unit-of-Measure and contains only that single qualifier: Pounds, Kilos, etc. Weight is historically a measure as taken specifically against the pull of Gravity - not Centrifugal force nor muscular extension/retraction movement, etc. 'Weight' is (Indirectly) a measure of Mass.
Pressure on the other hand is expressed by a pair qualifiers: Pounds-per-square-inch, Kilos-per-square-meter, etc. Pressure
underfoot is directly related to weight
when we're not moving. Once we're moving, the relationship between the two depends on exactly how
The distinction is important when you look at ski-snow interaction because a flat ski has many more square inches of contact to distribute pressure than an edged ski does. Likewise using Independent Leg Steering to increase pressure on the engaged tips of our skis is more clearly described as a 'pressuring outcome' than a weighting outcome.
Originally Posted by Max Capacity
This is skiing not Engineering. Lets keep it simple.
Keeping it simple is good but confusing the concepts and distorting the implications is not so good. I agree that we need to keep on-snow instruction simple but sometimes a few extra words on the chair prevents years of confusion and mis-application.
Originally Posted by Heluvaskier
No offense... but this is another example of why PSIA sucks at developing skiers. Harsh - yes - but in this instance true.
Epic didn't even suggest
that PSIA had anything to do with his own student's statement.
PSIA is very clear about the difference between Weight and Pressure. If the student believes he needs to "...keep some [weight/pressure] on the Inside-Ski to keep it working on the snow..." - then he thinks correctly. Whether Epic saw too-much or too-little weight/pressure on it (overall) and wished to change things is another matter.
Skier219 - nice breakdown. You mention 'pressure' as being the wrong word to use. Is there any other term that might work? Perhaps the real issure here is 'pressure' aganst the Base vs. 'pressure' against the Sidewall of the ski (on that inside-ski)?
"Pulling back the Inside-Ski" has the effect of supporting our 'weight' more on the forebody of that ski. The act of pulling the inside-foot back transfers our weight forward - not to the outside-ski... in fact, to pull it back we actually have to shift out CM to the inside
of the turn in order to bend the forebody of that ski and remain in balance. We're 'weighting' it *more* heavily when we pull it back.
If you don't believe this, try it on your own skis when standing in place. Try pulling either ski back and keeping its tail on the snow. I think you'll have no choice but to shift your upper body Mass to that side to accommplish the task and remain in balance.