These photos were obtained via a google search with pirouge and madagascar. It is hard to know whether some of these craft are proas that shunt, or whether they are tacking craft. Some seem to have the outrigger as a float and others as a counterweight, suggesting a tacking craft, though some seem symmetrical fore and aft, suggesing a shunting craft. It may be that the same craft can do both things, and the crew chooses to tack when the leg is short or when the wind conditions suit having hte outrigger as a float.