Instructables

Purple Fig Solar Cooker

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The Purple Fig Solar Cooker reaches temperatures between 250°F and 375°F. It cost less than $5 to make. The ingredients are:     2 pieces of 22" x 28" (55.88cm x 71.12cm) poster board.- aluminum foil - glue - 1 shoelace - 4 binder clips 3/4" (1.905cm)     ALWAYS use meat thermometer when cooking chicken and meats. Chicken is done at 165F° (72C).
 
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Step 1:

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Clip 2 pieces of 22" x 28"  (55.88cm x 71.12cm) poster board together.

Step 2:

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Step 2. Draw a line 14" (35.56cm) from long edge. Draw line to divide 14" x 28" (35.56cm x 71.12cm) into two 14" (35.56cm) squares. Cut on lines to make 3 pieces.  

Step 3:

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Step 3. Paint 1 side of each 14" (35.56cm) square purple and an 8" (20.30cm) square on one of the 8" (20.30cm) x 28" (71.12cm) strips.

Step 4:

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Step 4. Glue foil to un-purple side of each 14" (35.56cm) square and to one side of 8" (20.30cm) square.

Step 5:

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Stack 14" (35.56)  squares together.  On only 1 corner punch 2 holes at 4 7/8" ( ?cm) from corner and 5/16ths (?cm) from edge. Then stack both 8" (20.30cm) squares together and punch 8 holes, 2 in each corner at 1" (?cm) from corner and 3/8" (?cm) from edge.

Step 6:

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Step 6. Lay out 14" (35.56cm) squares with punched corners together, purple  8" (20.30cm) square on purple side and foil square on foil side.

Step 7:

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Step 7. Thread lace up from bottom through foiled 8" (20.30cm) square, 14" (35.56cm) square, then purple foiled 8" (20.30cm) square.

Step 8:

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Step 9. Then thread down through purple base piece, purple panel, and foiled base piece. Tighten a little and go to next corner with long part of lace.

Step 9:

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Step 9. Continue lacing through each set of corner holes until all 4 are done.

Step 10:

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Step 11. Turn over Purple Fig Solar Cooker and tighten shoelace and tie. The shoelace can be threaded to make the short lace on the cooking side if desired.

Step 11:

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Step 12. Pull up panels to make Fig (cone) shape. It can be stored in a grocery bag in this configuration.

I am going to try this, Love it

sclausson (author) 11 months ago
Solar cooking actually works even better in high elevations because the air is thinner. The air temp has nothing to do with solar cooking. If you check the solar cooking wikia you will see a person solar cooking in Norway in the snow.I am cooking solar fudge right now. The highest temperature I have reached is 475F°. I didn't put that in the instructable because people would doubt it. Most home ovens cook between 250F° and 350F° and that is what my little cooker averages. You need a low dark pan with a tight fitting glass lid to get best temps. There are over 300 people around the world cooking with the Copenhagen every day. I made the purple paper one so Everyone can afford the technology. My hope is that teachers and charities around the world make these. 2 billion people cook over open wood fires in their homes. This cooker will save trees, reduce lung diseases, home fires and burns. OK down off soapbox :)
chokapi sclausson11 months ago
Well, I wouldn't say that the air temp is if no consequence. If the ambient air temp is cold, it will make the container you're cooking in cold, taking it longer to heat. Also, if the wind is blowing, it will steal heat from the container and its contents as well. Now, if it could be sealed, as I've seen other solar cookers, it would insulate that internal area from as much heat loss.
sclausson (author)  chokapi11 months ago
Good question. Some folks use an oven bag around the cooking pan in windy areas. The continuous curve maintained with this cooker throws the air out quickly (no corners to capture the wind) and it gently waves in the wind. Not much cold air can get to the pan because the area around the pan is hot and hot air rises. For the larger size 22" (55.88cm) square panel with 12" (30cm) base I use a flat griddle with a Pyrex bowl inverted over pan to make a real hot little oven. At 33° lat. I don't use a bag and still get good cooking temps. Bread cooks very well in it.
chokapi11 months ago
Intriguing, and certainly attractive. I'm a bit specious of the temperatures, though. If you can show me a video, in outdoor conditions, of the oven boiling 20 oz of water at sea level in a reasonable amount of time (say, 15-20 mins), I'll vote for it. I'm a backpacker, and if this'll do the job in moderately cool (50* F) temps, I'll make one and field test it at some altitude, (3500 ft,) as well.
sclausson (author)  chokapi11 months ago
This video may help. A friend of mine in Canada made this video of my Copenhagen Solar Cooker. It is what I modeled Purple fig after.
http://www.youtube.com/watch?v=Gjr-VHq12kk
jessyratfink11 months ago
I love the design! This might be the prettiest solar cooker I've ever seen :D
sclausson (author)  jessyratfink11 months ago
Thank you!
SolarLuz11 months ago
Once again, Copenhagen saves the day. I TOTALLY love this beautiful purple solar oven.
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