I've modeled a simple boat and sail. I enabled cloth sim for the sail, and added a wind force. When I play the animation, the sail blows away the way it should if it were a loose piece of cloth. So then I parented the sail to the boat. When I 'grab' <G> or 'rotate' <R> the sail, the boat goes along with it. However, when I play the animation, the sail takes off on its own and does not take the boat with it, even though they are parent and child. Any ideas on some way to do this would be appreciated.