Pedal boat — pedal powered kayak
I made this single-person kayak boat with a length of 3.2 m and a load capacity of about 200 kg from scraps of boards, several slats and two sheets of plywood with a thickness of 4 and 6 mm.
Pedal boat assembly on trolley
The construction is based on two identical frames (pine, δ=20), placed at a distance of 1 m from each other. Slats of a longitudinal set are embedded in the frames (the length of the blanks is up to 3.5 m), which are connected in the bow and stern by the same vertical bars — rods. The set is sheathed with plywood, after which the case kayaks the outside is covered with a thin tarpaulin. The extremities are covered with a light canvas deck.
Schematic representation of the pedal kayak design
The bend of the stringers along the rim is conditionally not shown.
The boat is made of a screw, with a pedal drive. The most complex unit of the mechanical part is the gearbox. It is assembled from a pair of bevel gears that provide a gear ratio of 1:5 (you can use, for example, gears from the main transmission of cars «Volga», «Moskvich» or «Zhiguli»). The bigger the driving gear, the better!
Since the gearbox operates with a low load and at low speeds, its body has a fairly light construction: thick plywood is used (steel 2-3 mm thick can be used).
The shaft is made of a water pipe; a driven gear is attached to its bow end, six blades are welded to the stern end, forming a propeller with a diameter of 280 mm.
It is important to make a reliable oil seal (rubber or leather) in the stern, through which the propeller shaft is passed. No intermediate bearings need to be installed.
The pedal-powered boat reaches a speed of about 10 km/h. In any case, it goes much faster than on oars, and it's quite easy to work with your feet.
Boat projects for self-construction
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