I can’t tell you the name of the road (it’s a secret), but I can say that it curves up into the Santa Ynez Mountains. Also, that Billy Smith drives a car like he skateboards: leaned back in a longboard stance and turning the wheel with a skateboarder’s delayed maneuver. But he’s so absurdly affable that there’s never any disquiet. Cresting the mountain, he talks about how matching air resistance with gravity and terminal speed changed the lives of him, his brother, and his friends.
The occasion for this road trip is a demo of Sporting-Sails, a flying squirrel-style parachute that Billy patented with his brother, Nick. A sail is  … Details