Digital Full Size Plans on a Cd Length 18" sailing Catamarans KITAMARN
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Digital Full Size Plans on a Cd
Not a kit or Model
Digital full size plan prints on a 30” x 20” sheet files are PDF, Tiff and Jpeg
Digital two page article with building notes Files are PDF and Jpeg
Digital Files are TIFF, JPEG and PDF
Printing………..MAY BE DONE AT A COPY HOUSE
…………………………ALSO INCLUDED INSTRUCTIONS FOR PRINTING AT HOME
Some may wish to increase 200% and Radio control Digital plan very easy to resize
THIS is an inexpensive and very simple model which will surprise you with its performance and allow scope for experiment to increase that performance. As shown, the sail area is just enough to cause the model to fly the windward hull in a gust—rather alarming at first sight, but as the heel increases, the sail power decreases, so a state of equilibrium is reached and the chances of a capsize do not increase. Unless, of course, the wind is fresh enough to blow on the raised hull hard enough to tip it over, but this is one reason for carrying the twin fins in the position shown.
With ballast on the fins—perhaps only an ounce or so on each—the boat would be a lot stiffer and faster in a blow, and it would be possible to increase the height of the sail plan and use half as much again sail area on the same length booms. Obviously, somewhere there is a compromise between ballast and sail area which will produce the best all-round results, but this will depend to some extent on the size of the water and the customary wind strength and other conditions under which the individual model is normally sailed. Built as the drawing, and unballasted, most people will find the performance highly satisfactory.
Another field for experiment is in steering. Catamarans tend to sail fairly straight—in fact, turning them quickly is one of the problems facing full-size designers—and ours needs no rudder for normal sailing. However, our 36 in. design Sea Mew (plan MM 533, ) appears to make good use of a vane gear, so that some sort of steering, perhaps even a version of Braine gear for running only, may well he worth adding to this little model.