If you have the sheets in tight, a quick windshift can dump your boat, even with rudders up, especially if no one is aboard.
Karl Brogger wrote:
If you want it to weathervane into the wind you'd want mainsheet tension. And rudders up.
There's a whole crew of cat sailors that anchor off one of our local beaches. Every one of them uses a bridle, rudders up, and sheets in the main. Never heard of one flipping. It does seem wrong to have the main sheeted when you're not on the boat, but it seems like the way to do it.