This DIY video explains in detail, how you can build yourself a parabolic dish solar Cooker from scratch.This cooks almost as fast as a professionally made one .3 foot dish is made using only cardboard, posterboard, foil and glue. (3 large boxes 18″x18″x24″ – 3 pieces of posterboard and glue). boxes are from home depot and posterboard is from walmart. for reference, walmart sells the same size boxes so everything you need can be found there.
Make the focal point anywhere from 18″ to 36″ out from the surface of the dish and use heavy duty foil if possible. (dish in video has an 18″ focal point and is lined with heavy duty reynolds wrap aluminum foil). has about 85% reflectivity vs. 98% reflectivity of a professionally “mirrorized” dish. note: use caution around dish. gets very hot. do not leave unattended in the sun.