In crosswinds, I think the odds are that a belly pan would show slightly more improvement relative to skirts. But aero on anything but pure shapes is full of surprises.
"Anyone who has ever ridden a racing bike (or even done hiking) knows this: if the wind is at your back, it's a gift. If you are headed into the wind or blown sideways by it, it's a drag... literally.
Now, maybe if our cars had adjustable sails... "
Most rigid-wing land sailers don't adjust for wind direction, they just work. Life is different in an airfol than a human body.
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