Recently outboard motor was held in high esteem by the water-tourists. However, in recent years a large part of the waters became inaccessible for boats with internal combustion engines. Once again had to recall the sail, to once again take up the oars — Many, however, are not satisfied with traditional propulsion with a muscular drive efficiency the same oars is not too high. No wonder at the time, the paddle wheels were literally pushed by a propeller.
However, the screw is accustomed to seeing in a pair of the internal combustion engine than with bike pedals, but the effectiveness of such combination of mechanisms is quite high, at least much higher than traditional paddles.
One of the most successful works in this direction can be considered as a catamaran-aquapad design Kharkiv V. Popovich (his photographs were published in the August issue of “M-K” for 1986). In response to numerous reader requests, publish a description of the design of this catamaran.
About the benefits of folding designs can say a lot, no wonder the last time professionals and technology enthusiasts creating collapsible bicycles and motorcycles, boats, transforming planes and trikes. This is natural — the problem of storage and transportation is greatly simplified, if the vehicle is foldable.
For your family “craft” I chose the structure of a catamaran with inflatable balloon-floats. It successfully solved the problem of stability equiped and transformation of the boat in an easy to transport package. The engine was elected to the propeller driven by Bicycle type pedals. The transmission of torque to the screw through the gear made of the mechanism of hand drill. The hydrodynamic screw is within the ring, which allowed to significantly increase the thrust of the screw.