I hate to disagree with Horton but a wing can lift the tail of the ski!
Just last week I came back from the Nationals with a ski to try and in my rush to set the fin, I somehow in my biggest single boneheaded move, I put the wing in a 9.5 degree up position rather than down!
Went out and ran 28 but ski felt like it had lots of tip, squirrelly and very fast. Ran another 28, two ugly 32s, and tired 35, the last thing I clearly recall is ski turned harder at #2 than the shorter passes.
When I came to, I was next to number 3, wind knocked out of me, and my left side was numb and I could not more my right arm. After 15 minutes I could feel and move my arm, but still feeling the results. This was the single hardest crash in my life, and self-inflected. I did not realize my mistake until later in the day when I felt good enough to bend down and curse at the ski, and realized it was me.