Originally Posted by disski
know that - I have been told way too many times to edge FIRST then weight the engaged edge.... especially on ice when I tend to want to get weight fast onto the new outside ski(I know not to but damn it is tempting)
It just confuses me that everyone needs to TIP to engage edges... pronation feels so much more twist than tip to my feet... & I can do the physiotherapist's exercise with rubber bands while sitting down with minimal pressure & I am still pronating....I can see the foot change shape even....
& I know my ski edge engages when I do it in ski boots... (unless I only THINK I do the same movement)
The real problem with considering the equipment seperate from the skier, is the boot. The boot has such an impact on the skier's foot and balance functions that it is hard for me to seperate the two. So lets talk about how much the foot can actually pronate inside the ski boot. Without adding in movement of the forefoot lateraly, away from midline, there isn't much pronation available in a well fiting boot. Just enough to control where the foot is pressured on it's underside. In walking or stride science this is called a loading response. This shows up as the tibia load bears over the ankle and moves forward. There is a slight medial tilt of the talus and a loading and strecthing of the foot trusses, with the primary weight being born by the first metatarial. In skiing the foot needs loading in this way also. The boot can either help or hinder this as do footbeds also. Loading the foot correctly requires some medial movement of th eankle and talus, which most boot restrict, couple this with a footbed that doesn't allow the arch to collapse enough to tension it and move slightly medialy and we get a need to force pronation or this ankle tip into the inside of the boot.
Does this loading response pronation tip the ski? I don't think it does. It simply allows our weight to bear effectively over the edge. It makes a direct connection between our edge and our CoM. If we pronate the foot enough to control tipping the ski, then we probably have to much room around our leg shaft in the boot. It's the inclination of the leg that really controls edging of the ski. a pronated foot inside the ski boot keeps the CoM driving down on the inside edge. That's the stable connection we feel when we have the system working right.
Forcing pronation of the foot too far does force eversion, or lateral rotation of the foot away from midline. As you are starting a turn, this would be away from the hill though, and not into the hill. If you feel a need to re load the foot or force pronation of the foot with every turn, then there are probably some boot and footbed issues going on.
So on the pronation issue I'm sticking with role of pronation is to control where the foot pressure is greatest on the underside of the foot, and I'll leave the tipping action to my leg shaft. Having a boot that keeps your foot primed in this position is like the difference when you need water and having to prime the pump every time you turn it on, or just having to turn on the pump. Having to tip to engage the edge every time is like having to prime the pump everytime. If our pressure is in the right pace on our ski then our tipping (or flattening ) actions are much more immediate and productive.
Hope this doesn't hijack the thread. Later, Ric.