Skûtsje are a version of the traditional Dutch working scows that are now raced for fun (though I think a large portion of the video below is discussing what happens to the fun part of a traditional class when the racing becomes very competitive - note the PT training in the video). These are big boats, upwards of 20 meters, but narrow to fit the canals. They are unballasted, with two leeboards, and they do capsize, with some regularity, when pushed too hard.
Click here for the Wikipedia entry on the Skûtsje.
Warning: The following video is for sailing geeks like me, who would watch an excellent 1/2 hour documentary in another language, just to marvel at the shots of these work boats racing under sail. I wonder if we will ever see a version with English sub-titles?
Optimists at Rutland
9 minutes ago