SAIL - TRUE ECO-ENGINE FOR BOAT; Small crab claw sail (RoSSY project)

My adaptation of common crab claw sail. It is inexpensive, really easy to make and handle but surprisingly efficient and powerful. We had a lot of fun for less than 30 Euros :-) This sail was tested on different small boats at Zerdno Lake (Nowe Drawsko, Chata Toniego marina) and Drawsko Lake (Kusy Dwor; Poland). Sail area: 3.6 m2. Audio source: Jah Jah Bangs Quincas Moreira 3_32.mp3, Moons Patrick Patrikios 3_45.mp3