Check out the "Druah" tacking.

Unfortunately, my camera lens cover clicked partly closed during this sequence... but you can get the idea.

They release the "tack" and walk it aft. They move the rudder from "stern" to "bow" and the boat reverses direction.

Earlier this week he was sailing with a sugar sack sail (sacks sewn together for sail cloth). The local ladies made this "traditional" sail during the week and he showed up today with it.

http://www.hobieco.com/linked_images/worlds/10-19_druah/index.html