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if you want a solar cooker, use the formulas here : http://en.wikipedia.org/wiki/Parabola or http://www.intmath.com/Plane-analytic-geometry/4_Parabola.php Mark/ measure and cut out one half of a parobolic curve on a piece of plywood( your template). Cut multiple 1/2 parabolas and build it round to form a "dish" formation. ( make sure you have flat edges on the floor) Then line your "dish" with reflective material to focus the sunlight. (Personally , I like cut mirrors for maximum reflectivity) So a circular 1 foot dish gives you approx 113 sq inches or about 78 watts of focused energy. Enough to melt a marshmallow. Using an 8ft satellite dish equates to 7238 square inches or about 50 ft^2 and in full sunlight should focus enough energy equivalent to power a small microwave oven or approx 5000 watts. Thats enough concentrated light to melt the plastic and electronics inside the dish feedhorn or ignite a marshmallow in a couple of seconds.
Posted:Jan 28, 2008
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