The recipe's I looked at didn't say anything about flipping them or using a rack.
This year, I've been eating as much local produce as possible and thought that I'd try drying tomatoes too as I love sun dried tomatoes in things but they're so expensive.
Anyone read Barbara Kingsolver's book Animal, Vegetable, Miracle? It was pretty interesting. I'd been eating local stuff a lot before I read the book, but it's firmed my resolve to do more of that.
Cindy, did you ever flip them or did you use a dehydrator?