Our club has had good luck with Ginger. We've used REAL ginger ale, candied
ginger, and ginger capsules. The ginger needs to be consumed a little while
prior to the flight. Eating it while climbing into the glider seems to
reduce effectiveness.

The MythBusters did a segment on motion sickness and found Ginger to be the
only really effective non-prescription, non-drowsy inducing remedy.

John