This doesn't address my specific claim that the rebond energy can drive the skis/boots/feet through the turn transition. I never claimed that it can lift the entire skier like a trampoline, so I would appreciate it if you would address my actual argument instead of a strawman..
I've shown that the energy required to drive the skis/feet/boots under the body durng the turn transition is on the order of 250J.
I've also shown that the energy contained in the skis is on the order of 100J, i.e. a significant fraction of the requried energy
Which one do you believe to be wrong and why?
While NEC goes to find an answer for you....let me explain....the answer is in the video below.
Note the amount of energy there? A fair bit wouldnt you say? But there is two problems with it:
1) we dont get a ski that bent ever
2) we dont ski with a strap - this is significant difference because:
- With the strap 100% of the energy can be realised instantly, this creates the "snap" -
- in skiing the energy is released by rolling the skis flat - this takes time, meanning the release of energy is much slower, thus less significant
Look at this shot for example:
Look at how bent the ski is (ie how much potential energy is in it), then look at how many frames it takes to release it 3.5/4?
So repeat the experiment in the video below, but put the same amount of bend into it....and release it at the same rate as can be done skiing....what do you get?
A few more shots to compare:
Note the skis are not bent like the video...and the energy is released over 3-4 frames...not instant.
Finally - note the direction the energy is released.....it acts in a direction 90 degrees to the ski base.....so it cant push the feet "throught" or forward etc.
The ski does store energy...
...but this is just like the energy that a bow has. A bow will launch arrows but not a person. Even when you consider a trampoline, to get maximum lift from it, you have to work with the trampoline and time everything right. I think some people expect the ski to just haul them down the mountain or into the next turn. In my head, it is more like a well timed judo throw where you take your opponents energy and keep it moving in the direction it wants to go, though your opponent might disagree. If you don't do the move correctly, it doesn't work.
Same with skiing. I think more of the energy comes from the person than from the skis. Even in the bent ski in the moguls mentioned previously, I can jump higher than the bent skis can lift me, but if I time it right, using the ski I can get higher than just my legs alone.