[machine_coffee]

I wonder how well they hold up in strong storms, or if they can be folded away for safety.

[russellbeattie]

This was exactly my thought. We've all seen videos of giant ships caught in storms with green water splashing over the bow and are amazed they're able to stay afloat. Just from a glance at these sails, it looks like it would capsize the ship under in minutes in a decent storm. I would think either they fold down or they have to plan their routes very carefully to avoid bad weather.