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Parabolic dishes can be used to solar cook food and pasteurize water in disaster areas like Pakistan or Haiti.  Normally they are made using a petal template and then cutting 12 or more petals from a  piece of sheet material. These are then joined together to make the dish. Here is the "cone method" which is normally used to make full dishes.
I modified it because i need a half dish for an experiment.    If used to make a half dish, it seems that the cone method makes extremely good use of a 4 by 8 sheet of corrugated plastic.
It might just be that the cone method is easier than petals in this instance.
I show it here so that others can test it out and improve on what I found.
Brian
I added more videos about the cone method<br> They are&nbsp;&nbsp;<a href="http://www.youtube.com/watch?v=nbK61PTUPHw">http://www.youtube.com/watch?v=nbK61PTUPHw</a><br> Which is about the general technical drawing aspect of designing your cone parabolic dishes.<br> <br> and the link below is about putting strings through the corrugations to keep it taut<br> <a href="http://www.youtube.com/watch?v=nG_NfYWyY5Y">http://www.youtube.com/watch?v=nG_NfYWyY5Y</a><br> <br>
The project is continuing slowly. I have it in an album on facebook (with captions)<br>I made the half dish today. I still have to make something to keep it rigidly in shape. https://www.facebook.com/album.php?aid=278164&amp;id=736625766&amp;l=8b34cdb5e0<br>It is part of the tracking solar accumulator project so there is other stuff there too.<br>I will not be adding captions to that video because it is the first video about the subject and I do not plan to keep it very long.<br>Hopefully things will go smoothly and I can add an instructable about this. <br>The dish is about 1.5 sq meters so pretty big. Very little material was wasted.<br>Brian
Did you just make a video thats just another instructable opened in firefox?
Pretty much. I have the info elsewhere too but they do not have the great use of image notes that instructables has.<br> But admin closed off the instructable. (Due to lack of detail). <br>The detail is in the image notes.<br>I will fix the instructable at some stage. <br>I needed to get the cone idea out quickly because it has so much potential.<br>I, myself, might not be able to test it this year. <br>Work (masonry) competes for the sunny days, rainy season has come early, and I lose the sun in early October anyway. (North facing yard).
I don't understand spoken English!! No any single word in this case... <br><br>Can you add captions? Or better, to write an complete instructable. Thanks

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Bio: I am a stone mason. My hobby is making new solar cooking and gardening stuff. I have used solar heat to cook soil for a ... More »
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