This is one of those things that is easier to see and feel then explain, maybe someone can post some photos?
I’ll take a shot any way, take this with a grain of salt
When you bank, you tip your whole body to tip your skis. If you watch someone who is severely banking they look like an upside down pendulum. You could draw a line from their feet to their head (with theRusty’s killer software)
Another easy way to see banking is to watch to see if the inside shoulder drops. Our ski school jackets have a bright yellow line on the back so it makes it really easy to see.
Banking does work, but it is not a highly efficient way to edge skis. Partly, because it takes a long time to change edges and also because it doesn’t allow you to deal with all the forces that your skis are generating.
Do you ride a bike or motorcycle? Or have you ever seen a race? A good racer will corner by dropping a knee or part of his body into the turn to make the turn happen faster while keeping the majority of this body over the bike.
If you lean your whole body into a turn on a bike and your center of mass is way out over the bike, what happens? You fall over. Gravity will not let you bank on a bike but it will let you bank on the hill.
Instead of banking, Instructors will tell you they would like to see more angles or more angulation. Huh? What? Sorry for the instructor speak. Remember that line you could draw from the feel to head of the banker. Now imagine a skier who is got a pretty much straight line from there waist to their head and a diagonal line from their feet to their waist.
Where those lines meet would be an angle right? (Trying to reference 10th grade geometry here, wait a minute)yes that would be an angle. Creating angles allows you to create a higher edge angle, maintain balance, resist and redirect forces that build up, it also puts your body in a position to be more effective.
Banking or Tipping – ehh
Creating angles – kick a##
PSIA makes the distinction this way, quoted from the Alpine Technical Manual
Edging is created by tipping different parts of the body together
The higher the tipping occurs the larger the amount of movement
Involves forming angles between body segments and flexing and extending along a diagonal or lateral plane (eg. On a short radius turn your upper body remains stationary and your legs move)