Messing about in boats

Well, no prizes for guessing where I spent the weekend. My son Etienne is engaged on a series of experiments with the strangest boats, dinghies and speed-on-the-water sailing machines. This odd one, with a sampan type sail and "training wheels" (to save him from frequent involuntary swims) was quicker and more comfortable than it looks! Tomorrow I'll show a very elegant invention, a boat that folds flat and can be carried in one hand...