realskiers

 Not sure whether I agree or not with Peter's second statement, it's hard to know since I don't completely understand.  Here's what I think he is saying. 

Assume a 66 mm waist vs a 76 mm waist.  The effective balance point (where the force comes from the boot) is 5 mm farther from the edge of the wide ski, so more force is required to tip the ski to the same edge angle as the narrower ski.  Where does that force come from?  It comes from higher in the kinetic chain, requiring that the body mass be slightly farther inside the turn (creating more leverage).   That's where I get lost.  The skier is in balance on either the wide or the narrow ski at the same edge angle, and the extra force required by the wider ski is being provided by (slightly) greater body angles. 

That's where I get lost.  I don't see anything here that would require more speed?