Ski tip pressure from 2 force plates 

The blue line is the left force plate. The one toward the ski tip. Vertical force is the gray line.

Opps, wrote on the wrong line about the vertical force. If the tip was rockered values would probably be less for the ankle flex and movement of the CoM forward. The down unweighting would be interesting because there seems to be a slap which results in the a positive value. The rockered tip might enhance this value.