This is a project iv been doing during free days iv had this summer. Iv always wanted to sail like my grandfather. I think I understand the concept but don't have the terminology or experience on sailing.
My first was unsuccessful. It had a 4 foot PVC mast fitted into the drain hole. I held each side of the tarp sail with rope.
My second version went at speed of probably 4-5 mph.I didnt have a dagger-board so sterring was impossible. Iv now added one. The mast is about 6 and a half feet. Could be larger. I have pictures of this one rather then really explaining it.