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Step 5Making the curves for the solar cooker.
LOW TECH and why. I use homemade tee square and a piece of string to make my parabolic curves. I try out the curves on a little table (too little but the biggest I have) and when I am close to what I think is right, I cut out the curve. I am unsure how the bottom of the trough should be shaped so I have left it and can change it later.
The parabola is rotated inwards round its focus by 30 degrees. I ended up cutting one side of the parabola as a template, then cutting the other side from that template and then rotating this by 30 degrees on the focus. Then screw the pieces together and you have your main dish.
Originally I was just going to do the "cookit" with a long tail. But without cutting my sign plastic, the tail ends up going 6 ft in the air! So I went with something like the original design instead.
Brian
The parabola is rotated inwards round its focus by 30 degrees. I ended up cutting one side of the parabola as a template, then cutting the other side from that template and then rotating this by 30 degrees on the focus. Then screw the pieces together and you have your main dish.
Originally I was just going to do the "cookit" with a long tail. But without cutting my sign plastic, the tail ends up going 6 ft in the air! So I went with something like the original design instead.
Brian
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