Simple and cheap to make homemadeCatamaran for standing water and rivers with not very strong current. For production, you need a bicycle, large bottles of water, a furniture board, several boards and a metal profile (corner). Unfortunately, there are no step-by-step instructions on how to make this homemade, but from photographs you can determine what and how to do. First of the plastic bottles and boards are assembled gondolas. Then they are attached to each other by means of a connecting bridge, which is made of a solid furniture board. Next to the resulting design is attached part of the bike frame with pedals and on the metal corners of the bicycle wheel. To the wheel are pre-welded metal corners and bolted on them with wooden blades made of a non-thick wooden board. If it is a little more responsible to make the manufacture than the author of the homemade, the catamaran will turn out to be very good, and for a penny, if compared with expensive factory analogues.