I have to share this simple and super effective Solar Oven Design from Kathy Dahl-Bredine.
"Kathy and her husband are Maryknoll Lay Missioners working in Oaxaca, Mexico with local organizations on sustainable development among indigenous and marginalized rural communities. Kathy works with the organization Niño a Niño (Child to Child), a group working to empower groups of children living in poverty to work together with their families on projects to improve their over-all health and well being. Kathy has been working on alternative energy, specifically solar cooking projects with the children and their parents for the past two years."
Here is her plan for the most effective and easy to do solar oven I've ever seen.
Windshield Shade Solar Cooker
Kathy Dahl-Bredine developed the Windshield Shade Solar Cooker while experimenting with various designs of cookers to introduce in the indigenous communities where Kathy lives and works in southern Mexico. She hit upon an utterly simple way to make an instant portable solar oven. Taking a reflective accordion-folded car windshield shade, you can turn it into a version of the solar funnel simply by attaching little Velcro tabs along the long notched side.