Doc: Bingo! I think that single idea, that there are multiple kinds of light air, might be a key to upwind speed in the light. It boils down to the fact that, through the range of breezes we lump under the label “light air,” you make the biggest changes in your rig settings compared to any other conditions. We don’t really notice the big range because we usually only start races in the top of that “light air” band, that is, races usually don’t start unless there’s a reasonably stable breeze of at least 5 knots. But we often end up racing in some real drifters.