Catamaran on mattresses. Drawing, description

PERSONAL TRANSPORT: GROUND, WATER, AIR
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Catamaran on mattresses. Personal transport

Personal transport: land, water, air

Directory / Personal transport: land, water, air

For lovers of weekend hikes who prefer to relax on the water, a variant of an unusual light catamaran published in the Hungarian magazine "Ezermešter" will be of undoubted interest. This is a single pleasure "boat" with a rowing foot drive, which is based on two beach air mattresses. They are used without changes or any refinement, therefore they retain their traditional purpose. And in order to go on a small voyage on them - for example, go fishing or just "ride" - it is enough to lay a small wooden frame on top with an ordinary folding chair attached to it, popular with summer residents and pensioners.

Since air mattresses are purchased (ready-made) products, we will dwell in more detail on the base frame of the catamaran. It is assembled from wooden planks with a section of 40x20 mm and consists of two longitudinal supports 1700 mm long and crossbars fastening them - one front 640 mm long and two more 1100 mm each. Between themselves, the supports and crossbars are connected by furniture bolts with wing nuts - for ease of assembly and disassembly. At the same time, the front and middle crossbars are fixed flat (the first one is on top of the supports, the second one is on the bottom), and the rear one is from below and edgewise: so that it enters the transverse gap of the inflatable cylinders of each mattress. This pairing turns out to be enough to do without additional connections of the frame with mattresses (although, if necessary, it can be fastened additionally).

After the base frame is assembled, a folding chair is installed on its middle and rear crossbar and attached with metal clamps from a steel or duralumin strip.

It remains to install the aforementioned rowing drive - two foot pedals that reciprocate two blades bent twice from thick rubber from automobile cameras. The pedals are metal plates having a hinge from a window hinge, attached, in turn, to the front cross member. The plates are connected to the blades in a special way - curved (see Fig.) metal rods made of a rod with a diameter of 6 mm, the hook-shaped ends of which are screwed with M4 bolts. For ease of assembly and disassembly, the pedal loops can also be attached to the crossbar using bolts with wing nuts.

Catamaran (click to enlarge): 1 - longitudinal support (2 pcs.), 2 - frame cross member, middle, 3 - frame cross member, front, 4 - pedal (2 pcs.), 5 - rod (2 pcs.), 6 - propeller blade lining (metal plate, 2 pcs.), 7 - rear cross member clamp, 8 - middle cross member clamp, 9 - propeller blade (2 pcs.), 10 - pedal loop (2 pcs.), 11 - wing bolt nut (6 pcs.), 12 - frame cross member, rear, 13 - air mattresses.

The final assembly of the catamaran is carried out in shallow water near the shore: air mattresses are laid on the water, and the frame with the chair and the drive is carefully lowered and aligned with them accordingly.

To protect the wood from excessive wetting, all frame elements are carefully impregnated with drying oil and painted in several layers with oil paints or waterproof varnish.

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